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DEC-XV-IRSMA-A

September 1976

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Pages:	71
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OCR Text

XVM/RSX PART XI
CONSTRUCTION OF ADVANCED TASKS

CHAPTER 1
CONSTRUCTION OF ADVANCED TASKS

1.1

INTRODUCTION TO ADVANCED TASK CONSTRUCTION

This chapter describes advanced task construction in the RSX system
and presents conventions for writing such system tasks as the
following:
· MCR function tasks
• Task-development functions
· I/O device handlers
· Interrupt drivers
Procedures for constructing these tasks are similar to those required
for on-line development of user (or application) tasks. Regardless of
function or complexity, all tasks must be:
• Assembled or compiled
• Task built using TKB
· Logged into the system by means of the INSTALL MCR
task or, in the case of CONSTRUCTed tasks, by FININS

Function

· Activated and executed, using system directives,
Console Routine or the MULTIACCESS Monitor

Monitor

the

The remaining chapters in this part of the manual define precise
requirements for constructing advanced tasks and present examples of
operational tasks in each of the categories mentioned above.

XVM/RSX V1B

XI-1-1

September 1976

1.2

GUIDELINES FOR ADVANCED TASK CONSTRUCTION

The following guidelines summarize certain basic requirements
constructing all Tasks described in subsequent chapters.

for

All hardware registers are available to the programmer;
registers are reserved exclusively for system use.

Naming
conventions
exist
for
MCR
Function
Tasks,
Task-Development Functions, and I/O Device Handler Tasks.
Appropriate conventions are described in each chapter.

Tasks should not exit while I/O, mark-time, or Event Variable
settings are still pending; premature exit might cause the
Task to be overlayed by another Task before all necessary
operations have completed.

Tasks should not exit without relinquishing system resources.
In particular, the following functions should be performed:
• Unused "nodes· should be
Empty Nodes."

returned

the

"Pool

the

Unexpected interrupts which suspend Task execution
always save and restore active registers before use.

must

• External I/O buffers should be freed.
• Attached devices should be detached.
• Open files should be closed.

The issuing of a System Directive results in a
original contents of the following registers:

loss

• AC

• XR
• LR
• MQ
• LINK
• SC
• Autoincrement registers 10-17
• System registers Rl-R6
• Location 20

XI-1-2

CHAPTER 2
CONSTRUCTION OF MCR FUNCTION TASKS

2.1

CONVENTIONS FOR MCR TASK CONSTRUCTION

MeR Function Tasks are responsible for handling operator requests for
~nstallation,
activation, and scheduling of user or system Tasks, as
well as a variety of other procedures described in the MCR manual. To
supplement operations performed by these modules, the user can write
his own MCR Function Tasks.
He must adhere to the following
conventions:
1.

The name of the MCR Function Task must consist of three
followed by three characters, as in the following:

dots

••• INS
••• REQ

••• ABO
2.

Because MCR Function Tasks must address registers within the
Executive, all MCR Tasks must be built to run in EXEC mode.
This implies that the partition in which an MCR Function Task
runs must be in the lower 32K of core.

All MCR Function Tasks-must be invoked from the Resident
Monitor Console Routine.
The Resident MCR is initially
requested by typing CTRL/C (tC) on the MCR device.
If a
carriage return is used to terminate a particular MCR command
line, the Resident MCR will be automatically invoked after
the
function specified in that command line has been
performed.
If an ALTMODE character has been used
as
terminator, CTRL/C must be typed each time the Resident MCR
is desired.

MCR interaction is carried on from the device associated with
LUN-2. Listing output is associated with LUN-3. Both LUNs are
normally assigned
to
a
terminal
dedicated
to
MCR
conununication.

The
command
input
line
must
be
read
using
the
"Fetch-A-Character" (FAC) subroutine. Additional input lines
must be initialized by the "Initialize Fetch-A-Character"
(IFAC) subroutine.

To enable further MCR interaction, the MCR Function Task must
clear the "MCR Request Inhibit" (MCRRI) flag before exiting.

An MCR command terminated by a carriage return requires that
••• MCR be requested.
If the command line ends in ALTMODE,
the Task must zero MCRRI before exiting.
XI-2-1

2.2

SAMPLE MCR FUNCTION TASK

This section presents a sample MCR Function Task named ••• DIS, which
is used to disable a Task.
A full assembly listing of ••• DIS is
included on subsequent pages. The following description summarizes
the flow of control through this program.
Line numbers in the
leftmost column below refer to decimal line numbers included at the
left margin of the assembly listing.
Line Number

Label

Description

64-91

DIS

Start here. Fetch characters from the
input command line, using the resident
FAC subroutine in the Executive, and
build a 1-6 character Task name. The
Resident MCR with Task name ••• MCR, is
responsible for requesting the DISABLE
Task, named ••• DIS, and for reading the
command line such that FAC is ready to
pick up the character following the
first break character in the command.
Check for a syntax error.

ENDCRA

Save the code for the line terminator,
carriage
return
or ALTMODE, to be
examined prior to Task exit.

93-112

DISN2

Convert the Task name from ASCII to
.SIXBT and store the name in the DISABLE
CAL Parameter Block (DISCPB).

113-12~

Issue the DISABLE Directive to
the
Executive
and
wait for completion.
Check for an error.
If an error is
detected, print an error message.

121-127

EXTlA

Exit sequence. If the line terminator
was
a
carriage return rather than
ALTMODE, request
the
Resident
MCR
Dispatcher Task ( ••• MCR) and do not
clear the "MCR Request Inhibit" flag.
If the terminator was ALTMODE, clear the
flag but do not request the dispatcher.

128-159

WAITF

CAL Parameter Blocks (CPBs),

and error messages.

XI-2-2

variables,

PAGE

- DIS~! - slfC------------ ----

---,-

I
I

_____ L

I TM~ INFORMATION

IN THIS OOCUMENT IS SUBJECT TO

I CHANGE ~IT~OUT NOTICE AND SHOULD NOT BE CONSTRUED
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DIGIT~UI~MENT CORPORATImi~§§_UMES _~_~u~~.s_~Q!!~_

SIAILITV FOR ANY ERRORS THAT MAV APPEAR IN THIS

10
11-

Doeu~ENT.

-- --.r-

-----------·-·------1------------------

TH~ SOFTWARE DESCRIBED IN THIS DOCUMENT 1$ fUR",-O---T"HE---puFfC-H-'SER--UN-OE-R .- L.fCE-NSE FOR USE ON
A SINGLE COMPUTER SYSTEM AND CAN BE COPIED (~ITH
INCLIJStON OF DIGITAL'S COPVRIGHT NOTfCE) oNLvFOR-I US! IN SUCH SYSTEM! EXCEPT AS MAV OTHERWISE BE PRO17---------- - ---------nllff-n-IN- -iilRTffNGB-v-D1GfTAL~- - -

1"3"

14
15
le_
18

-f§"

---2122

----.. --------~----------- -

-1-~fI-S-H!D-

I
I

------------------------7-0fGffA-L--EQ-UIPME1ft -CORPoifATION ASSUMES NO RESPONSlfHLITV
I FOR THE USE OR RELIABILITV OF ITS SOFTWARE ON EQUIPI MENT TiiArIS NOT SUPPLIfD BY DIGITAL. ------..---------I

--w---------------,- COPVRI!;HT ---rtY- f974,BYorGI'fAI.- lQuiPMENT- CORPORATIO~
24
·--2S"--

I
-,----------------------

.EJECT

XI-2-3

~.-.-----

PAGE
a7

OIS.!S

SRC

I
I
I

31
32

I
I

EOIT -5
COPYRIGHT 1970, 1971, 1972, DIGITAL EQUIPMENT CORP., MAYNARD, MASS. MC~

FUNCTION _. DISABLE

I TASk NAME

" ••• 015"

1 MAV 72

R. MCLEAN

TO DISABLE A TASK •

_--.;3.;4_ _ _ _ _ _ _ _ _ _ _ _-----!/~~:_:_=_=_....._;_;;_:_:_;;;_;;;:_ _=~=_:;::_:_=__;;_=_:.__=:_;;_7:_:_~::_=;:__------------ _ _
38
I TH! FIRST LINE OF THE COMMAND INPUT FOR ANY MCR
---,;;3;,::::e_ _ _ _ _ _ _ _ _ _ _ _ _/~'=_=U'_::N=C=_=Tc=I_=_O-'-N...__2IS=_=_=_R_'_::E'_"A=_=D BY THE RESIDENT MCR
37
I FOR TM~ "DISABLE" FUNCTION, THERE IS

I
I

TASK (" ... MCR")..L.u __
ONLY ONE LINE OF
COMMAND INPUT, AND ITIS SYNTAX_I~~~ FOLLOWS I

__~4~0_ _ _ _ _ _ _ _ _ _ _ _~/7-_ _-=S~Y.~NT~A~X~.~'~D~I~S~'~SC~N~B~C~~cBREAK CHARACTER~<T'SK NAME~
41
I
(cCb/cAM~)
-

_---.4,..a____________----'/':--__---'-c;;-BR-.:E~A~I<___:c:_:CHAb • " "I"...t.!!..... __________ ____ .__ _

cTASK NAME~ • 1-15 ALPHANUMERIC CHARACTERS
cCR~ • CAR RTN
-~
cAM:I> • AL TMODE
45
cNBC~ • NON BREAK CHARACTER
'---..;...;7--------------/7----~S-'-·;:..·::-~N~OF "INCLUDING ZERO"
4$
44

I
I
I
I

,
I

~lfESTDENTMtR-1fE"iOS --A LINE~ FETCHES -THE-!S0
,
FIRST THREE CHARACTERS TO FORM THE MCR FUNCTION TASk
- - """"!T
I
NA1fE-T~ •• DIS"l;--'-L:lisHE!i"C-ifARACTERS-T"MRi:fTHE"-IRST
!Sa
,
~REAK CHARACTER, REQUESTS " ••• 015", AND EXITS
53
I
THE TAsk" ... DIS " PROC'ffifi- THE REMAINDER OF TifE"LiN-t-AND IF THE REQUEST_I..LV~_L!D, _I~SU~§ AN_~~~~OP'HAT~ "DISABL~"
-54
r r - - - - - - - · - - - - - - - - -I , - ---- nlRECiIvE;!Se
,
--!STI
IF THE COMfilANO INPUT LINE n TERMINAfEDB"y""-ACARRtN,
58
,
THE RESIDENT MCR TASK IS REQUESTED, AND THE FUNCTION TASk
F.XlTs.
-------.--------------- - - .-- --~
I

---.g---

-"5182

-- 83---

- --------------,-- --- -frTHECOM-MANO INPUT- Cl-NE- fs tERMINAtE-I) BY AN AL fMODE, THEI
FUNCTION TASK EXITS wITHOUT REQUESTING " ••• MCR". A AC TYPEIN
------------------------7----- --TsTfoiEN"-NECESS1Ffy- 10 RE,;,tsTABLIsH MCR -DIALOGUE.

XI-2-4

-o1T;-lf-SRe---.,,-MCR ~-u-N-cTlbN - i OfSA-BLE'

-----------------------;ffTLE
diS
157

6e
eD

000171"
'000174 A

A ----OIS--

"'02f00Tn7771

00001 R 040140 R

~C~'UNCttO~ IbIS .. BLEI

- 000010- A- ---i(f0-.-U-

----,r-

.**

I
MCRRY-t 7 t
FAC-174
~~
I$!~D~ TO FETCH TASK NAME AND STORE
__ l!li_CHAU~lERS H_~~C'-RJ~~'-_U!J,J_ J_N. __ _
eNT
(OISCPB+l)
IDISABLE CAL PARAMETER BLOCK
(XUI)

00004 R 1211143 R
DUN!
JMS* ____ (FACL_~IETC~ A_~_I'!!B~~_H~
SAO(0!54)
I IS IT .. COM"'''
000015 R ~40144 R
00006 R ~500020 R
77
_ JMP
ERRI
IYES -- ERROR IN SYNTAX
---=7"'=--8---'-----;::~~--i::-----=-'~~-=----SAD
-(040
)~O;;;:;;.-81. ANI< 'l--~-- - ------00007 R ~4014!5 R
00810 R f5IIl0020 R
79
_.J~f:'___ _
ERR1
lyES -- ERROR It-l SYNTAX
SAD- (0T~) iNC.;' CAR--"TN'l
00811 R ~4U4e R
0f!I812 R 50011123 R
81
_____ .JH_~ ___ ENDeRA IYE5.- END OF REQUEST
---82SAD
117-fff - iNO-~;;A-L.i'M-ooh - 1110813 R ~4f1J147 R
flJlllflJU R 1500"23 R
83
JMP
ENDCRA IYES·- ENO OF REQUEST
SA
-~---xrr----iNo-... STOREC~RAC-fE-R----0aulS R Bh0t0 A
000UI R 44111140 R
815
lSI
CNT
I~AST CHARACTER OF TASK NAME?
------0- --------JHP-- --iffSijr---/NO-';"'GET !liE-Xl CHARACTER- 00817 R 50f1J004 R
87
LAC
-- -TMES2'--lGlfT S-VNTAX -ERROR -MESSA-G-E ADDRES-S
00020 R 2001150 R
8D
00021 R 040111 R
OAC
TYPCPB+4
__ IPUT IT IN TY_~_L~~~~l ________________ _
00022 R 80$110154 R
~
ERRTY
IREQUEST MCR AND RETURN
715

--- -78

-eil

------n

- -- ---

XI-2-5

----------

*** MCR FUNCTION 'DISABLE'

PAGI!

117

1111153 R 111111157 R
,rMP
EUtA
10K NO -ERRORS---------- - ------.1.54 R 10111115 R
ERRTV
CAL
TYPCPB IMAkE TYPE CPB REQUEST
111155 R ,e'IIS5 R
wlXTtv CAL
WlITF
0.158 R 5111181 R
JMP
[XT2
IFINISHEO EXIT
---"==--=II=-=I::-...S..:7-----R-,2::-::1I::-::1I:-=1-;i:3-=,-R;----;;;;E=X=T-:-tA-:--~L-:-A=C-- SVBk CHI GE T TE RMIN ATI o-NtH.RitTER
1111511 R 541114S R
SAD
(15)
ISKIP IF ALTMODE
.eeel R 01,II1II7 R
EXT2
CAL
REQMCR IRE QUEST fIICR TASK
IIllSa R 5411141 R
SAD
(175)
IIF ALTHODE CLEAR MCRRI
011.&3 R lell151 R
DIM*
(MCRRI) ICLI!AR ~C SWITCH
rIIIls. R 1IfIJ1142 R
--cC=A=L=--_ ~ ___ LRETlL~_________

III

liD

121
121
122

lU
lU

- - - - - -

125
128
127

1111155 R 10.1128 •
0111.112 R

lal

-~12~8.------';I-=-II:::...er.e~R

1:51

lU
---nr

lU
---ur

IBIIl87 R BI.001 A
011070 R 0110110 A
11'071 R S5~e5e A
01072 R 151322 A

138

WAITF

21
~v

REQMCR

ICALL MeR DIRECTIVE

137
138

B117. R 1111121.
D%SCPB 21
/FUNCTION CODE
111175 R 10'112 R
~v
IEVENT VARIABLE ADR
--~--11/10715 R II/I.ell A
HiTfHIC NIMrU'YR"STHALI') 1411
11111177 R 101011 A
~
ITA~~ _!,"M_~ _C~!C.!l_~O__HA~F)_
-l-U
l1li 1111 R lillie"" A
- ----~
142
811111 R le.ell0 A
0
IC'DISCPB'+2 THRU 'OISCP8'+8 IS USED TO
-~i•.,...,3~-----.II"...I/J.....l--I/J....
2----R.....,1.....1r:.=IIJ""Ol.,..i!l-l......------·--=PI---~/cAi-....
Sr.S!lr:M"'Sr:-L-=[--rA SK"N1MrTNTO ·.s fiiftT·---- --.
144
11113 R 011ellll A
PI
nr- 1IIJ1U R nllJ01 A
- - - 0---14S
I
- -147 ---- IIIIIlU5 R 01112700 .--tynPe- 270111-- --7WRTfE
148
00118 R 00.112 R
~V
IEVENT VARUBLE
---no--.
IIIIU7 R U.1II3 A
3
ILUN NUMBER
151
011110 R 111.112 A
2
1I1)!'S ASC 1)__
----T51
lUll R If1II123-.r---------- Mf"SJ
01112~_111~~ __ ~~-- -~- - . -- ----u

-- ill------ ---

l1li113 R 1lJI.11Il2 A

154
• -------

uu_

a811. R 1".,010 I

MESa

2 ' __ IL~~~.~_! _____ NOI.~_~~!.~1.~ __ ~£l~_n_~1_5_•

00115 R 4222~2 A

- ann-R-n584S-A- - - -

0111117 R ~'53~2 •
-01T20-lf--~~-A----

10121 R 202132 A
00122 R 251032 •

00123 R 010AIIl2 A
1110124 R 00U0Q1 A
10125 R 422232 A
1Il0126 R 32Se;QI A
00127 R 405471 A

ME 53

21 I,

.ASCII

-·0013"0-- R·320-234--'- - - ----- --- ---.. - ---- -------00131 R 415~04 •
0013-2 Ir-j4,fe34T

XI-2-6

"DIS-TASK

NoT IN SYSTEM"<15>

PA(;-!

5 - - -oIs.5--SRC----;;.-MCR-FU N CTION 'DISABLE'

-- 00-13;rIi20i473- i. --1l1li'134 R 151850 A
1210135 R 425321 A
1~8

151

f'8

01!113~_~ _~~~~~_,,__

121121137 R eI2l0~0121 A

SV8KCH

~~_

- 0pfI40 R-i0011l1210 .--- CNT- - -- '"

159~_ _ _C::-=--:--7"'C:--::;---;:0-=12I~0-,::-I!!=QJe=--=R;:---:--___

1211211'1 R 12100075 R *L
1211211'2 R 121012101121 • *L

~ E NO _~U__ _

-- iiiiff43T-00i-174--A-.L----1211211'4 R 121001215. A *L
1211211'5 R 121000'121 A *L
12101'8 R 000015 A *L
00147 R 000175 A *L
1210150 R 01210113 R *L
0121151 R 001171 A *L
_____________ SIU-00152

_ NO __ ;~~_~'!.J.l~E_S

XI-2-7

,.AGE

CNT

iliUm

DIS

DlS.~

11101111

DUCPB

IlIIe7.

DISNI
DUN2
ENDCR.

ueu

E"RTY
ERR!

UT1A
UT2
,.AC
MeRR!
M!S2

MEn

eellu
11123
III!!.

ueu

110112
110 I!! 7

nlSt

11J01U74
010171
110113

71
711-

113

CROSS RHERENCE
8~

l:se.

15"
li7
1:57.

SJSJ

111

7:S-

ngQJ

115

SJ2-

117
1211
57-

123-

Sih
88

12!5
15.131*

88-

le2-

1!5~*

121

UU!S

81i

118

1:S1*
1.7-

11iI1iI:S!S

11SJ114
iSh

110

128-

01111110

t12

.-.-----~---.-----.--

TVPCPB
NAITEV
NAITf'

lUI

_._------- ----- ---_._-- --

151
123
SJ2

1118~

113
148

121 ..

0111157
001:57

lUlU

118

- - - - - - - . - - - - - - . _.-

l1e7D
128

-----"-------------

SJ!5

R!QMCR

sV8kCH

----""--"--

U:s

-------

------------ ------

---------~---.-----.

~----------------------.---

XI-2-8

CHAPTER 3
CONSTRUCTION OF TDV FUNCTION TASKS

3.1

CONVENTIONS FOR TDV TASK CONSTRUCTION

TDV function tasks facilitate on-line development of user
tasks by
providing a means of editing,
compiling,
assembling and bullding
tasks.
All TDV tasks are invoked by the MULTIACCESS Monitor.
MULTIACCESS supports the following standard TDV tasks:

• FORTRAN IV Compiler
• MACRO Assembler
· Text Editor
• Task Builder
• File and directory utilities
TDV function tasks should not be confused with MULTIACCESS Monitor
commands.
Such commands are usually overlays to the MULTIACCESS
Monitor and serve to control the user task-development environment.
On the other hand, TDV functions are separate tasks and include those
facilities necessary to perform program development.
To supplement operations performed by standard TDV modules,
the user
can write his own TDV function tasks.
He must adhere to the following
conventions:
1.

The name of the TDV function task must consist of three
characters, followed by three dots, as in the following:
FOR ••.
TKB ..•
FIN .••
The user should be careful not to terminate his TDV task with
four dots,
since this format is a naming convention for I/O
handler tasks.

Most TDV function tasks can be built to run in either user
mode or exec mode.
An example of one of the few TDV tasks
(INSTALL), which
that must run only in exec mode is INS ..•
modifies
locations in the System Task List and must,
therefore, address locations outside of its own partition.

XVM/RSX VIB

XI-3-1

September 1976

I
I•

TOV tasks should be built in user mode whenever possible
because an exec-mode task cannot be relocated to a partition
other than the one for which the task was built. Task
relocation is a desirable feature
for
MULTIACCESS use,
because it allows the MULTIACCESS Monitor to perform dynamic
partition selection to maintain system throughput.
3.

All TOV function tasks must be invoked from the MULTIACCESS
Monitor.
This Monitor can be requested by typing in CTRL/T
(~T) on any terminal .

TDV function interaction is carried on from the device
associated with user virtual LUN-12.
Error messages are
associated with virtual LUN-13.
Both LUNs are assigned to
the user's terminal as soon as the user logs into the
MULTIACCESS system.

The command input line is transferred from the TOV line
buffer to a buffer within the TDV function task by the XFRCMO
system directive.

XVM/RSX VIB

XI-3-2

September 1976

3.2

SAMPLE TDV FUNCTION TASK

This section presents a sample TDV function task named DEL ... that is
used to delete files
from a directory on disk.
A full assembly
listing of DEL ..•
is included on subsequent ~ages.
The following
description summarizes the flow of control throuqh this program.
Line
numbers in the leftmost column below refer to decimal line numbers
included at the left margin of the assembly listing:
Line Number

Label

Description

79-92

DEL

Using the XFRCMD directive
(line 53),
the lOPS ASCII command line supplied by
the user to the MULTIACCESS Monitor
is
transferred
into the DEL...
buffer
(line 360).
The MULTIACCESS Monitor,
with task name TDV ... , is responsible
for requesting DEL ... , the DELETE task.
The XFFCMD directive must be used by all
TDV function tasks to obtain co~mand
string text.

93-103

FLUSH

Flush through the first break character
(i.e.,
ignore all characters in the
command line up to and including the
first
space character).
If a
line
terminator is found,
it is a syntax
error,
because it means that no file
name was specified in the command.

104-169

NEXFIL

Pass control here to process the next
file name after a break character is
found.
Convert the file
name
and
extension from ASCII to .SIXBT, check
for errors and store the results in the
DELETE CPB (line 360).

170-183

Issue a
request to DELETE the named
file,
wait for completion and check for
errors.

184-195

Loop or exit sequence.
If the file name
delimiter in the command is a comma, go
back to process the next file name.
If
the delimiter is an altmode,
simply
exit.
If it is a carriage return,
REQUEST TDV...
before exiting.
If it
is none of the above, the delimiter
is
illegal and results in a syntax error.
The convention of reguesting the task
TDV ••. when the line terminator
is a
carraige return is not necessary under
MULTIACCESS.
This convention, however,
must be followed if the TDV task
is to
be run under a release of RSX prior to
XVM/RSX VIB.

XVM/RSX VIB

XI-3-3

September 1976

•

Description

Line Number

Label

196-228

ERRl

Code to print error messages.

229-269

UNPACK

Subroutine used to unpack characters
from
lOPS ASCII (five per two words) to
five per five words.

270-353

PAC

Subroutine used
to fetch a
character
from the lOPS ASCII command line.

354-391

REQTDV

CAL parameter blocks
and buffers.

XI-3-4

(CPFs),

variables

PAGE

~.-------.---~

DEL.16 aRC

••• TOY FUNCTION "DELETE"

4
S

___~__

7
8
;
~

-_._------

~---.--

• Tl TLE--;• •TOV'ifNCTioN--''-OELETE n

I
I
I
I
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FIRST PRINTING.! JEBB.!.l~ltL_~~74

THf IN'DRMAT.lML.llLJHIS DOCUMENT __ U __ ~UBJg_l TO______ _
CHANGE WITHOUT NOTICE AND SHOULD NOT BE CONSTRUED
A5 A COMMITMENT BY pIGITAL EQUIPMENT CORPORATION._
I DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPON.
I SIIULlTY FOR ANY E.!RORS~!.L~£MLI~ TI"tU________ _
I DOCUMENT.
I

_____

__ _

THf SOFTWARE DESCRIBED IN THIS DOCUMENT IS FUR.
14
I NI$H!O TO THE PURCHASER UNDER A LICENSE FOR~~ __ __
IS
I A SINGLE COMPUTER SYSTEM AND CAN BE COPIED (WITH
_--.ll
I INCLUSION OF DIGITAL'S COPyRIGHT NO~ONL'LfJ1R ________ _
17
I USE IN SUCH SYSTEM, EXCEPT AS MAY OTHERWISE BE PRO18 _ _ _ _ _ _ _ _ _ _ _ _----!/'----'-Y---"'-I=D=EO"'---'I'--'-N'--'--'W-'--'-R=IT-LCI"--'N-'-'G'-----=B-'----Y 01 GIT!1......._________________________ _
I~

I
I

DIGITA' EQUIPMENT CORPORATION ASSUMES NO RESPONSI8ILITy
FOR THE USE OR RELIABILITy OF ITS SOFTWARE ON EQUIP-

-;;::2c;2_ _ _ _ _ _ _ _ _ _ _ _-'I':-----'-M-=E'--'-'-NT THAT 18 NOT SUPPLIED BY DIGIT!h_______
_ ____ _
2~
I
24
I
2S
I
~2_=_e------------ I---.....--::;-;-;;;~------_-_ _- _ - - _ - - _ - - - - - -

...

~EJECT

XI-3-5

D!L.18 SRC
28

I
I

:JIll APR 72

C. PROTUu

I CDPVRI~HT 1871, 1972, DIGITAL !QUIPM!NT CORP., MAYNARD, MAS~S~.L-_________
I
I TOY (TASK D!V!LDPMENT) TASK, NAMED "DEL ... ", 'OR DELETING 111.~~~lta_~_ _
I T~E DISK VIA "LUN".

31
32

n
S.
35

38
37

111111I11111111111111111111111111111111111111111111111III

I
I

TDV~DEL

FILE1,'%LE2,I'%LE3

I
I

TDV~D[L

'ILEl SRC,'ILE2 8IN,FILE3 803

I T~!

I
I
I
I

---rser-------------------------~/~C=D~M~M~&N~D~S~T=R~I~N=G-E=X~A~M=P~L~E~I---

I
I

_____~ __ ______________1____ ____~ ___ _

--~4.T-------------------------~/~/~/~/~/~/~11~/~/~/~/~/~/~/~/~I~/I~/IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

nLE NAME EXTENSION IS OPTIONAL ... ~ "SRC" IS THE DEFAUUA~8UMPTfoN~-- - ~ ~
.7
I
.8
I 1M! eOMMAND INPUT LINE IS READ 8y THE RESIDENT TOY TASK ("TOY ••• ") AND
_____..""8----------------------------".---=I:....:S'--'-T-R..:......A..:..:..N-=-S':......:E::..:R-=-R-=E::..=D---'..T...:......O THIS TASK BY MUNS O'THE~~..RC"'D DIRECTIVE. _~~_________
5.
I
51
I
eOHHAND SYNTAX • 'DEL'.cNSP~cSP~cl'ILE NAME~((CSP.cEXT~)/)
-----srccOM-~cnLENAME~ ITc~sP.cExfi)7rmt~Rj;/c(Mi) --- 52
I
53

I
I

bi
55

I
I
I

b8
57

cNSP~ • NON-S'Ae! eHARAeTER
cSP~. A SPACE CHA~ACTER
~cnLE NAHE~ • 1 TO
ALPHANUMERIC~CHiRACTERi
cEXT~ • 1 TO 3 ALPHANUMERIC CHARACTERS

---n-·----------------------------';,.-------c=-;e....O.r.M.-::.--=.-----7A----;C...O~M,...;"'nA,:..:::'---~-------- --~--.--~-~- -- ~ ~ - --- ----- ~ - -~58
I
cCR.. A CARRIAGE RETURN

000021 -A
00001!1 A

7.
7!1

78
77

-'1~~

LUWilT'--

~D~C

ILUN NORMALLY ASSIGNED TO DISK.

TDVTTY.13

~ __ ~_n~_ERRO~~_~~~ ____ ~ __ ~~ _______ ~~ __ ~ ___ ~

.oCt

IAUTOINCREMENT REGISTER 10.
IUSED WHEN THE SKIP IS NOT INTENDED.
ISIZE OF THE COMMANO LINE BUFFER FOR UP
ITO 80 CHARACTERS.

00011110 A
XU-1III
i-DX-tst
4.00~0
___C~~Sl~·4~
1/l0.~,!~~

~--------------------

XI-3-6

----~~-----~-------~--

PAGE

- DE-L: ~ fe- SRt------------••• -10V- FUN CTl ON "DELETE"

7g
80
----81

Ql0f1101/J R 00~3e ~ - 00001 R 0003'2 R
800e2 R 777762 A
C110003 R 5403" R
--- 00ri1-ji-R50mlf7·j---

83
8'

8-5
88
- -- 87
88

80
81
SI2

--~--

DEL

CAL
r;lL

XFER
WAITFR

ITRANSFER THE COMMAND LINE

S.O

ICOM~AND

L..-w----.. le----

-' ' P

R~AD

;X-S-'-HE--ei.iFFER- nrO- Sio'!-AL.L. ~--1:-f..;
LINE TOO

BV "TDV ••• ".

is -tHE

LO~G?

/YES.

ERRl

--------.-.-- -1--tN·tT1A~LizE THE FETCH-A-CHARACTER SUBROUTINE. THIS MUST HE DONE HERE,
_ _ _ _ _ _ _ _-!/~RnHER __'@~ur~_N~_!~SEM!~~Q__ l"!__ l~ __ ~_ASL!~E_ t!~K :r,~_fJ_~~_O_ J"'-_C;:.9B~ __~~Q_______ _
1 IS THUS NOT REINITIAL.IZED.
1

-'0lllllli!lTR20C11422R--------CAC(FACLB+2)
00005 R 0'~313 R
OAe
FACLBX
00007 R 200'23 -,,- .. -- -l~Ae
CfiCCB+~)-___0~0:....:0:....:1..:::c0_R_'0:....•. . :11I;. .:3'_"1__'_.___
R
_:_---~f..--.J~-Cj:B.!------- ____ .. __ ._______ . _________ . ___________ ._

!:
•~

1
I FL.Y_~~

_________________

COMMAN.o

~",PUT THR_D_UGI'I

THI!: FIRST 8REAK CHUACTER •

C110011 R 1002'7 R
_~L~SH
JMS
FAC
I'ETCH A CHARACTER FROM COMM.ND ~INE.
- ieiff2--T'54g'24 RSAD
T40)
ISPACE?
00013 R 600C1121 R
JMP
NEXFIL
"----vr
80014 R !U0d!5 R
-ulI-cT5)-------7CARffiAGE-R-ETURN?-100
0001e R 741"'00 A
SKP
- iii
0001Tlf-S'0'iUR
---~-AD
- (175)
IALTMODE?
102
00817 R 8Q10121 R
JMP
ERR2
ISYNTAx ERRPR.
103-0002SR 5'0011111 If ------------- JMP
fLlfsH
85
;,
88

104

----fIT
108
[IT

108

1 uNPfEl(fHEffiE NAMr.------- ---------.-----.--- -----

- ------ ---

- - -0002"CR 20U27--"----N-riFIL: - iAC- -- (BUfI';;r,00022 R 050'311.1 R
DAC*
(XlI)
-~-r~T

IINITIALIZE THE NAME 8UFFER.

net

toe

.---- IUNPAC-K
NAME (UP
"cHAR-.CTERh.JMS _--'U::....N-'-P~~_K________ '-1t~t~_~~lF. ~~_~~~QR._qft;UR_:.:.R.:;EI)::..:.!...__ _ _ __

LAW

-.~-

In
110 _ _--=0-=.0024 R 100221 R
-----------,----------nl
112
I' CONVERT --_.
Tt4E
!!I-.E_ NAME. TO_ ._SIXBT_ ANQ ST!JREI_T IN T':I_E OEL~:rE CP!!_
------------------,---------

0"3
11'

.DEC
- __ 0011120 R 200!52-Fr----------LA~- - u---ifiJr+2-----115
00025 R 540e05 A
LRS
6
---rTf ------l/1li027 RUn! 1 If
LIC---B\Jfi 1
118
000~1 R 54,e05 A
LRS
5
--00031 R 200;'!50 R
-------1.Ar----- BU,..
120
000~2 R 540614 A
LLS
12
121"
-80033 R -Tlf2j0A------- ------sNA--122
100U R «SltUl R
JMP
ERR2
ISYNTAx ERROR ... NULL FILE .. _~.~_~_g_. ______. _____ . __
In
0003! R 0'0333 If
~At
DElOtrr+r----------124
010~6 R 2003ee R
LAC
BUF+,
--rw
00037 R 6'0~0iS •
1:lfT"-- ·-6---125
00040 R 20t3~4 R
LAC
BUF+4
.. -----ur---00041 R 64051ll$ •
.--- --In -T - ..
128
01042 R 2003e3 R
LAC
BUF+3
12D
000.! R dAteU i
LL-s----U---·- - . - - - . - - - - - - - . - - - - - - - - . - - ---.------.------.130
01044
R
040334
R
CAC
--- fh-- -- ---------------------- -OELETf+4
.115'-

m--- - __

-n~-----

~OCT--

XI-3-7

_u _ _ _

- _...

PAGE

*** TOV FUNCTION "DELETE"

•

IND .- ILhEGAL DELIMITER.

US
U7
U8
.--;I~.c;.8_ _ _--=-0I1I=-:1II=-;5~7--;,;R--,:-7=-71,-,7:-,:7:-",.,----=,A_ _ _ _ _ ~~ _ _ ~ _________
15e
1111181 R 180221 R
JMS
UNPACK

151
-----rsr-

I
I

153

----,---sr--155

-----Tn---- 157

--,n158

rn-----

181

152 ---

183

n-~----------

185
Ue- 187
In-188

0011181 R 200350 R
UI15a R 8.0588 A
111111183 R 200357 R

. _____ II..!.NL~C~~~1!J~UJ!~L1VP __ ~Q ~-.--CJ'lA.~~tTE~~l.
IRETURN IF NO ERROR OCCURRED.

COhlVERT THE FILE NAMEElCTENSfoN To·h.-SixsTANo sToIiElT-fN---tHfDECfTE-t-P-B~----- -----:OEC
LAC
aUF.&
- IRS- LAC
aUF.7
-. - - - ---

i8lilGiU A 15'0!1/I8 A

0011185 R 200358 R

-·-5·-·-----·-~·-·-·---·-·--

LAC

BUF+6

- -T~f -

IIIIUe It 641118U A L - L r

. OCT
-SNA
JMP ______ ~_R2 _______ _

00111e7 R 741200 A
01l1li171 R 800121 R
8011171 R 74111111.10 A

SKP
I

---- -------------,-USE: THF. DEFAULT EXTENSION "S-RC".
I

32R--U![SRC- LAC---t2'32203)
-i.SIX8T "SRC".
80073 R 04(1)335 R
nA; ______ ~~~_!,!:~.~_____________________.___ _

-~f9V2Ir__z;aQ,_..

----,711------- -- - -

------------------- I DELETE THE FILE AND ~AITFOR COMPLETION.
0011174 R 11100330 R
r.AL
DELETE
IDE~ETE THE FILE.
I n - -nv-s-RB034'2""R---- CAl.
WAITFR
175
0011178 R 200344 R
LAC
EV
------rn--00G171 R :5401433 II
-----0-0-- ----I;.;l'"3J __ u________ ------177
00101/1 R 800123 R
JMP
ERR3
IFILE NOT FOUND.
178
00101 R 54~.34 R
~AD
(-54)
17g
00102 R 800125 R
JMP
ERR4
IFILE STILL OPEN.
180
00103 R 741100 A
SPA
181
00104 R 600127 R
_______ ~!_~ _________ ~!!~~ __
__ .}DELETE ~~~OR_. ___ _
182
- ----------------------1

171
172
173

183

---r- -- --

~EJEc:T

XI-3-S

lSi
185

187

lea
18;
lre--

-·m

lIJiH05 R 211"113415 R
001015 R 54e43JLR
0010,--"R-eiiii21 R--00110 R 540425 R
- 00BTR00e4S0 R---·-

::~ ~~

~:~:::

LAc----cHA-R-------·- -. - .-.. - -- -... ---. --.-.-..-- - ... -..
SAD
(54)
ICOMMA?
JMPii/ElCFIL.
IYES -- PROCESS THE NEXT FIL-E NAME.
SAO
(175)
IAL-THODE?
CAL.
neY
IYES .;.. SIMp·LY EXIT.

i:~ _h_.iL5L _____ .___ ~~}:~-AGL~~Tl!R~?.

1513
110114 R 500121 R
~P~~~_g
Ir4
-00115 R 000323 R "'·-EXTT-- CAL
REQTDV
185
~~ll.!~. 00U30._R_ _ _ _ _ _ ....t.AJ.___.__ H!lJ .. __ . __.... _.
·Ue--- - .
,

IN.O . .. -JI.!.,.EGAL DEI..I"'~TER.
,REQUEST "TDV ... ".

_ IEl!H WJTHOUT WAITING FOR HESU\.T.

, ERRORS ... PRINT THE ERROR "'ESS~GE AN..!L ~~t.I.REQUESI ~1.Q_~.H."~ ~VE~ _I.f ..
, TH~ LINE TERMINATOR IS AN ALTHQOE.

187
10e

18;

. - -00117" 208435T---nlH-·-i.AC·

211

00120 R 741000 A
SKP
-----TfiTlT200.-38R·--·!RR2 -- CAe· --1p4£·s-2)
00122 R 741000 A
!KP
~.
00123 R 200437 R
ERR3
LAC
a05
00124 R 741000 A
SKP
- 2U----·--~5 R 200440 R
- ERR·"'·--Lic···
(tolES4)
217
001215 R 741000 A
SKP
"2-18--00127 R 200441 R
. ERRS--LAC-- ·-··CMEs~f
I"DELETE" ERROR.
a0;
00130 R 04~142 R
nAC
TYPE.4
-~---.
00131 R 211111J344 R
LAC ---EV------·--mvEEvV.LUT·si)"TH-~TSOMEONI-·MAY-Tx.MINE
211
00132 R 040347 R
OAC
ERR COD
lIT BY USING THE "OP~N" MeR FUNCTION~
212- - - . -00133 R 000135 R
- -CAL. TYPE-----· --- ,t-YPE TtoIE MESS-AGE.·
.
-...
a13
00134 R 000342 R
CAL
WAITFR

2n·
al3

·zfi·

00f3~e001~-----JMT-EXIT-

215

·--2111
217

. - ---2"18
a1g

0
.---

--·-ne

001315 R 002700 A
001~7 R 000344 R

TYPE

2100
F.V

-------·-0114, R QU!lemlt5 .. -------"-------TDVfty---- - - - - ---00141 R 000002 A
2
00142 If 1401!140

221

-- ~··itDV···t·TV-EIHfOR L.u ....
IIOpS ASCII.

------.-- --- -/MESsiG~ '"t'ORE-SS.

--~

1J1/Ji43 If 1bIII!S1Ii1i2 I
00144 R 00011100 A

",ESf

00145 R 422131 . - - - - - - . - - - . - - - . - - - -..- - . - . - - - . 011415 R 428e30 A

- . -°

01...,.---,r-ue 3 IS III .-----_----;0....0r-:;1...
570.....,R..-5i-Oi2Mj0i-ii2715-=:-III-'A.-_ _ _ _ _ _ _ _ _._____ .___.. ____ ._ ...-. -.-- -- _.._- _. _ .. _ .101S1 R 4'&~54 A

00152 R 048235 A
-.-.-.--.-.-.- .
00154 R 5al100 A
-- 001 S5 R 1UJ4111i1J2 A
_ _ _- i0".0,..1,..,5&
.........R.......;,I....I.;..I.,..,01;;.;0;;-,A,.---_ _ _ _ .--- - - _ . _ .. _. __._---_.. _-- .. - ..-. _ .......... - ..... _._._--_._._ .. __ .. .
11151 R 422131 I
001151 R 42815415 A
·--e~Pf41"2181

-. -- -----lITIf

~·S2-A----·----

--- - -----. ---" .-

XI- 3-9

PAGE

DEL.18 SRC

- - - - - - - - - - - - - - - ... _----

*** TDV ~U~CTION "DELETE"

-----;;:.='-.-,1elr.2----R....-.-.....-='.,ee"""=-----.,---------- -- ---------------- ---~
.1183 R 2"2132 A

.1171 R '2881' A
11171 R '.8311 A
.1172 R 521234 •
_ _~1",;'-71..
7 .R..------;;;....7.;8~5;,U;,__:;A_;__--- __________________ . ____ _
.1174 R 8'3238 •
11175 R 52135" A
8117& R '8e •• " •
225
'11177 R 8"S"12 •
.IZ61 R "'11' •
• 1201 R '22131 A
'12B2 R ~25e14 •
• 1213 R "5318 •
1121. R 521245 •
• '2'S R 522231 A
"ZI8 R .48111 A
.1217 R .75'11 A
------------11211 R 5'7132 r------------225
.1211 R 88.""2 A __ !!~~~__
"04",2,
- - --- -- _n__
IUU R 88"'e •
'1213 R 422131 •
3"...'

lun

jii 428ell I
IIJ821SR '25318 •
1112115 R 552212 A
.111217 R 2IIl2132 •

11221 If
227

-'2T-

-:-um----------- ---- ---- ---

XI-3-10

-~~--.-------

22i
. - - ----- ----------- -- --'-Su8RnUTINE UNPACK .;.- -UNPACK 7·-BIT ASCII CHARACTERS FROM THE COI'IMANO
231
I INPUT LINE AND STORE THEM SEQUENTIA~LV IN WBUF" VIA XlI (A~READV SET UP).
-ii1...3rTl--------------/:.--.;T......H'"'F~"'r.:-EG AT XvE COU NT
(lUX I ,",Uk Nu~bT1: HARAC TERS+irn-fNftfE- -AC-.--- -232
I

233-

.... - --- - ----

'CALL-ING SEQUENCE.-

234

238
-. -237
238

I
I

2n-

~COUNT iN THE
.-J.~_S

___
U&A~_____.____ . ___ . __ _

(RETURN IF NO ERROR OCCURRED)

--- --- ------------------7TLTEREn--IfEGISTERS:

240
- "Iii

I
-. -. ---------.-----------;----

242

I
UNPACK

2d
244

2.45

00221 R 011111fIJl"
00222 R .4.3.5 R

AC & MQ

0---------------·------··OAC

'---ii2u-"A 1III0urR-{ooPi- -jM-S

CNT

FA-C--

248

l~~_VE. COUNT I.

l'E1CH A CHARACTER.

00224 R 048348 R
OAt
CHAR
u,---- -882"2-!-R' S4U31 R
SA"D
(!U)
ICOM"'A,
U8
01225 R CS01U4 I'
__ 4~---~.OT~!l---.- _____l!~__ ~~_DE~~!J;.RJ. ____ . ___________._.__ .. _
--:fig
01127 R 7i3737 •
..~
.~,
250
11230 R 7411fIJ0 A
SPA
"lSi
--i023T-RH8u4T --------- J~NerTeaT
.77
252
18232 R 7237~1 A
AAt
2n8Un R 74mlf/UII A
---SMA
254
88234 R CS8m244 R
JI'IP
NOT8ST
2SS
liIJ23! R 440U5 R
---yntNT
258
10235 R 741008 "
SKP
-257 ---- -----80237R601121-R-·--·--:fl'lP----ERR2------ -- -noo 'UNV CHAfhcTEffs.
258
11241 R 2083.8 R
LAC
tHAI'
_/~!qRE_CHAFUCTER •.
-In
- 08241 R 100818 A
OAC.-- ---xtT ----2151
1iU1242 R CSI0223 ·R
_ _ _ _--"-JM~ _ _L!!q~L ________.__ . __ ..... ___.__ .. __
-_._------_._---_._----281
I

---m---- -- -___________

~-F-I-LU-N-T-H~--R~~~INDER-~~- THE I'tiAI'IE WITH ~ER_O..!S~_

- ----rn-- 2U
--nr-2158

--Tn-----

882'S R S2B221 R

JMP.
UNPA~'
-:EJEEf---------·-- --- '--"------

XI-3-11

DEL.U SRC

.*. TDV 'u~CTION "O!LETf"

278
271
272
273

I
I
I
I

SU~R"UTINE FAC •• FETCH A CHARACTER FROM THE 5/7 ASCII LINE BUFFER 'FACLB'.
THE INOICI!! 'FACLBX' AND 'FAccax' MUST aE SET WHEN A NE~ IS REA~
CHAlUCTfRS ARE NOT "ETcHED BEYOND TERMINAL CHARACTERS.
- - - - ----------

275

I
I
I

SEQUENCEi
JHS
FAC=------------------------ ------------ ------- - - ---------- (UNCONDITIONAk RETURN WITH CHARACTER IN THE AC)
------------------ -

27'

----us-

C_LLtN~

277
278
278

_ _ _ _ _ _ _ I_AL n'tEJL~~!!JERSI ______________ _

2Il

_ _ _ _ _ _ _ _ _ _ _ _---"'-c--_ _ -.AL!.._~ _______________ _

I
I

--281---

--nr283
214
215

---DT
217

-"2U218

01a'7 R 180180 A
li258 R 2203l. R
11251 R 7'8111 A
I125a R 5111277 R
11253 R 201"2 R
1125. R UB3U It
012155 R 221313 R
l1125S R U1II313 R
11257 R 052188 A

FAC

18277 R 5'1'25 R

FAC2

LAC*
II'ACCaX
SMA
-JM'P - ----'FTC2-LAC
CFAcca.l)
--- ---- OAC-FACCBl( --LAC*
FACLBl(

IFETCH THE NEXT UNPACKED CHAR AciiA7Ro-M----rFAccBi-. --

____ tW_~~__ H~Lc:H,·lt~~_li'L8J.!.F1~~----'!__~g:_Bl __ ~!'l~n1 ___ _

INO -. TEST FOR A TER~INAL CHARACTER.
'.f!.C;ll..'----I.RO"'_J__""_~ __ I.Nl'_u_T ~lN1J __ _

_1!~~ --~EII'H.J..

I (FIRST

IOX--n~-------------

HALF OF WORD PAl!U-L--_________________ _

LMQ
nUl/! If 75.1111 A
---ClATtLr --2i2
283
el201 R 101315 R
JMS
FACUPS
I(FIRST C~'RACTE~).
2D"4-~ R 111305 It
- jMS
F.CUPS
I (SECOND CHARACTER).
285
10203 R 10838' R
JMS
FACUPS
I(FIRST • aITS OF THIRD CHARACTER)
--fl'!'""Inu R 221313 R
LAt*---mLex-------/CS!'coNTf"H-AO'Ci"fWo1fO--PAIRr; - ---'--287
IIa05 R "0313 R
rDX
FACLBX
-288
luee R 0'1517 A T - I f S -17--------- - -- in:-isf-3 BfTS 0" THIRD CH_RiCTER).
U8
10207 R 20031. P
xOR*
FACCBX
---- 10270'- QIi'0314~---------1'-AC.- FACCBX-300
301
10a71 R 75e001 A
CLA
----nr01272 R 1113o, R
JMS
FACUPS -------'CFOURTH C-HARAC"TER)-;303
01273 R 111305 R
JMS
FACUPS
I(FIFTH C~ARACTER).
n.r
--iaI2T4'1C20111'43 R
LAC
(FltCB)
IRESET THE C~ARAtTER BUFFE~ INDEX.
315
00275
R
0'0314
R
OAC
FACCBX
- --one -- ---- -mi218lf- 22111314 R
--TR.-- -F'ACCBX
;,'ntH THE FIRST CHA-'HCTER FROM THE

307
--,n-U8
310
311

3"12-313

0li3-10-~-'!21112~7jf--

00301 R 5'0.25 R
--- - Q;103HT--a2'0-2""'-'R

314

315
310
317
318
319

_~~~~}~~R_ ~~!...fIR-,

SAO
--JMP*
SAO
j"'l'*

(015)

FAC

(175)

FAC

-I

IIF IT IS A TERMINAL CHARACTER, CARRI.GE
iREl'URN OR ALTMOOE, RETURI'ot wITH THE CHARACTER
lIN THE AC BUT 00 NOT AUGMENT THE CHARACTER
IBUFFER INDEX. THUS, REPEATED CALLS TO FAC
___ ~...b..~ _~ EI~ ~_~ 1 H_;_ J!~!H _N A!-_C HARA CTE.r~_-,._______ _
lIT IS NOT A TERMINAL CHARACTER .- AUGMENT
ITHE CHARACTER BUFFER INDEX AND RETURN WITH
ITHE CHARACTER IN THE AC.

00303 R "0314 R
00304 R 020247 R
~EJEc:T

XI-3-12

PAGE

DEi..16 SRC~

-- -rSUflRi'lUTINE FAtUI'S

320
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--'22---~2~

324
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328

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332
333

I
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SU8ROUTINE USED BY 'FAt'.

C.LLINr. ~cQUENCE:

I
I
I

~27

I
I
I
I
I

AC & LINK MUST BE CLEARED.
NEXT CHARACTER MUST BE IN
THE HIGH-O-ROER ENOOF THE MQ.
i~ACC8X' MUST
POINT TO THE
-WORD PRECEDING THE ONE~rN
wHICH THE CHARACTER IS TO
-13-E -STORED-. -- -J"'S
~ACUPS

-rUNtONDftto~-f.L-

R-EluRN -wITH

iFACCBX' POINTING TO THE
---STORED CHARACTER AND-wff~f--------- ---- -------- - - - THE A~ !~I~~ LEFT C~EAR~O)

33e
I
ALTEREn REGISTERS:
337
--------338-------- -------------;-I -----------____________----:./~- AC~__M_Q________________________________________________ _
33P
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341
. 342
343
344
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3.8
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0030!5 R 000000 •
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rox
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nAt. - - -neCBl(CLA

I$HI~T THE CHA~ACTEA INTO THE AC. THE (bw
IORDER BITS 0' T"E THIRO CHlRACTER ARE ZERO
. ieECAusCTME· LfNK--is ZERO~
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XI--3-13

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. _ - - - - - - - - - - - --.- - - - - - - - - - - - - - - - - -

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IGO.RO WORD .~tUAR.~t~es 'INDI~~
ICARRIAGE RETURN AT END OF BUFFER.

01425 R 008015 A .L

-00427 R 10~347 R *L
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IE VENT VARIABLE.
. ---- - -

I~OONTER~--

IINPUT CHARACTER.
-- --'EV -YALiiE-s-'YElf 8EFOR-E ERHOR- PRINTOUT INICASE SOMEONE WANTS TO EXAMINE IT USING
. - ---. ------ --- --lfiif" "OPEN"i1CRFuN CTloN;.- - _.. - -------- ------

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XI-3-14

- Dll~-r6-$RC-----.-•• T-DV-FUNCTiON "DELETE"

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XI-3-1S

"AG!

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DEL

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255
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XI-3-16

CHAPTER 4
CONSTRUCTION OF I/O DEVICE HANDLER TASKS

4.1

CONVENTIONS FOR I/O HANDLER CONSTRUCTION

I/O Device Handlers are Tasks responsible for controlling
the
operations of I/O devices. Unlike front-end interrupt driver Tasks,
I/O Handlers are written to facilitate concurrent use by several Tasks
by means of a standard system interface, I/O Directives. Although the
basic RSX system provides Handlers for all standard I/O devices, the
user can facilitate the operations of nonstandard or infrequently used
devices by writing his own I/O Device Handler Tasks.
Conventions for constructin~ I/O Device Handler Tasks and a brief
description of the most important concepts behind the operation of I/O
Handlers are included below:
1.

The name of the I/O Device Handler Task must consist of
characters, followed by four dots, as in the following:

two

LP ••••

Co ••••
AD ••••

Characters included in a Handler Task
name
typically
represent the name of the device associated with the Handler
(see Table 4-1 below).
2.

I/O Device Handler Tasks are built to run in EXEC mode.

The RSX system effectively allows device independence.
I/O
requests are typically issued by Tasks to devices identified
by Logical Unit Number (LUN). Requests are queued, by means
of the QUEUE I/O Directive, and are routed through the
Handler associated with the appropriate device.

LUNs and their current device assignments are stored in a
Logical Unit Table (LUT). There are one-word entries or slots
in this table for as many as 512 different LON assignments,
and all can be reassigned or removed by means of the REASSIGN
MCR Function Task.

The Attach Flag Table (AFT) contains a one-word entry for
each LUN.
When a user Task requests that a device be
attached, the AFT slot for the appropriate LUN is set to the
address of the requesting Task's System Task List (S'l'L) node.
If a LUN is not attached, its slot is filled with zeros.

XI-4-1

The Physical Device List (PDVL) is a system list or deque
containing a series of nodes describing all physical devices
in the RSX system.

I/O Rundown is the delaying of the availability of a core
partition until all transfers to and from that partition have
stopped or have been allowed to complete.
I/O Rundown is
performed when a USER-mode Task exits.

Each time a LUN is assigned to a particular physical device
unit, the I/O Device Handler for that device is requested by
the REASSIGN MeR Function Task. When in core, the Handler
then initializes itself by connecting to an interrupt line
and by entering its Trigger Event Variable address in the
appropriate PDVL node. This effectively informs the system
that the Handler is ready to accept I/O requests.

The Handler idles in a wait state until the requesting Task
causes the Trigger Event Variable of the requested device to
be set, indicating that the Handler is needed.

10.

I/O requests are handled by processing requests according to
Task priority. If a device has been attached, only requests
from the attaching Task will be serviced, until a DETACH
Directive is issued. Requests from other Tasks can, however,
be queued.

11.

Handler processing proceeds at Task level (API-7), but can be
interrupted by hardware interrupts from the device it is
handling. The interrupt service subroutine which performs
this interrupt operates somewhat independently of the Task in
which it is found.
Interrupt service routines must save
commonly used registers on entry and restore them on exit.

12.

When a request has
been
completed
(successfully
or
unsuccessfully),
the count of current I/O requests is
decremented before the Event Variable associated with the
request is set and returned. The Handler then waits for the
next Trigger Event variable to be set.

13.

When the last LUN assigned to a Handler is reassigned, the
Handler associated with the referenced device must relinquish
system resources and disconnect from its interrupt line
before exiting.

14.

Special I/O buffers located in a Task's partition are
available to I/O Handlers for buffering small data records.

xr-4-2

Table 4-1
RSX Devices
Device Name

Device

Handler Task

TTn

Terminal

TTY

DTn

DEC tape

DT ••••

MTn

Magtape

MT •.••

Disk Driver

DSK

Fixed-Head Disk

RF ••••

RPn

Disk Pack

RP ••••

RKn

Disk Cartridge

RK •.•.

Paper Tape Reader

PR •••.

Paper Tape Punch

PP ••••

Card Reader

CD ••••

Card Punch

CP •.••

Line Printer

LP •.••

Analog-to-Digital Converter

AD ••••

Automatic Flying Capacitor Scanner

AF ••••

Universal Digital Controller

UD •.••

System COMMON Communicator

CC ••••

VTn

Display

VT ••••

VWn

writing Tablet

VW ••••

XY Plotter

XY ••••

XVM/RSX VIB

XI-4-3

•

September 1976

4.2

SAMPLE I/O DEVICE HANDLER TASK

This section presents a sample I/O Device Handler Task named LP •••• ,
which is responsible for handling the LP series of line printers. A
full assembly listing of LP •••• is included on subsequent pages.
The
following description summarizes the flow of control through this
program. Line numbers in the leftmost column below refer to decimal
line numbers included at the left margin of the assembly listing.
Line Number

Label

Description

209-291

START

This is the Handler
initialization
section
required by all I/O Device
Handler Tasks. Between lines 209-213,
the
Physical Device List
(PDVL)
is
scanned for a node for this device.
If
the node is found (line 216), this means
the device name (line 260) was found in
the PDVL and the node's address is
returned in the AC register.
If the
node is not found (line 215), the Task
exits since no node having the name "LP"
was found in the PDVL. Once the node
address is returned in the AC, the
address of the Trigger Event Variable in
the node is calculated and saved (line
218) •
The
interrupt line is then
connected (if no connection was made the
Task exits)
and the address of the
Trigger Event Variable is placed in the
PDVL node (line 223). Lines 225 to 227
calculate an adjustment factor to
be
used for the Index Register later ,.,hen
obtaining
arguments
by
indexed
addressing in areas outside the current
4K memory page. The Handler then clears
the controller and waits for the Trigger
Event Variable, TG, to be set (WAITFOR
TG) •

294-297

WFTGR

Wait for the Trigger Event Variable to
be set nonzero, indicating that an I/O
request has been queued.

299-348

The Trigger Event Variable has been
triggered.
(The CAL Service Routine in
the
Executive
triggers
the
Event
Variable whenever the Handler has an I/O
request.) The Trigger is cleared (line
303)
to prevent the Handler from being
inadvertently called when the WAITFOR TG
is
again issued.
At line 327 the
request is dequeued
(remove from
the
queue)
and, if the queue is empty, the
Handler issues a WAITFOR TG, which will
be set at the next I/O request for this
device. If a node was dequeued,
the
request node address is saved for later
XI-4-4

Line Number

Description

Label

node access
(line 330), and the CAL
Function Code is extracted (line 334).
The CAL Function is then
tested for
ABORT, ATTACH, DETACH, etc. During the
attempt to dequeue a request (line 329),
if the dequeue
as not made (empty
queue), a return from DQRQ immediately
follo'.,s the JMS; othertvise the return
is at JHS+2 (line 330). If the dequeue
\-las made, the AC contains the address of
the dequeuec1. node.
If
not, the AC
contains either zero, (if the queue was
empty), or nonzero, (if the device has
been attached).
This is useful when
Device Handlers are multiunit and the
REASSIGN MeR Function removes one of its
units from the Logical unit Table.
T.....

352-377

ABORT

The ABORT request can legally be made
only by the I/O Rundm'ln Task, lORD
(lines 352-354). It is a request to
terminate all I/O for the named Task.
At lines 369-377, the DHTQ subroutine is
called to detach (if necessary) the line
printer and the LUN by \'lr.:ich it was
at taCh(3d , and then to empty the Line
Printer I/O Request
Queue
of
all
requests
Hade
by
t.'1e named Task.
Because the Line Printer Handler 1s
internally buffered and does not dequeue
another request until a transfer
is
complete, it is not necessary to stop
possible
ongoing
I/O.
For
other
devices, this is not generally the case.

382-390

ATTACH

Routines to ATTACH, DETACH,
Handler Information (HINF).

410-901

Routines to prepare information for and
handle the hardware of the LP device.

908-913

and

return

Subroutine to wait
for
the
Event
Variable to he set nonzero and then to
test if an ABORT request has been made.
Whenever an ABORT request is queued, bit
2 of the
Handler's
Trigger
Event
Variable is set nonzero. If ABORT is
pending, it must be honored at this time
because WFAB may have been called to
wait for expiration of a mark-time delay
(lines
893-894) ,
following
a line
printer not-ready condition. Since the
printer could remain in the not-ready
state indefinitely, the Handler cannot
wait for that condition to clear before
performing the ABORT. At line 927, the
DQRQ subroutine is called to dequeue the
ABORT request node, whose address is
returned in the AC register. Then the
XI-4-5

Line Number

Label

Description
DMTQ routine is called to detach the
printer and the LUN by which it was
attached (assuming it was attached).
DMTQ then empties the I/O Request Queue
of all requests made by
the
Task
referred to in the ABORT request. When
the ABORT request has been honored, the
Event Variable is set (line 931) to
signal the I/O Rundown Task of this
fact.

942-967

SEVRN

Subroutine for setting the requester's
Event Variable from the value in the AC.
This must be done using the
Index
Register, since the requesting Task can
be located outside the 32K addressing
range (line 953). Once I/O is complete
(this includes setting the requester's
Event
Variable),
the
requester's
transfers-pending count is decremented
(line 957) so that a count of pending
requests
(which
could
alter
the
requester's core) is maintained. This
count is necessary for the success of
I/O Rundown.
A Significant Event is
declared (lines 959-96.0), which
may
cause control to pass to a Task of
higher priority (i.e., if that Task has
been waiting for the Line
Printer
Handler to set its Event Variable).
Finally, the I/O request node, no longer
needed, is returned to the Pool of Empty
Nodes (lines 962-965).

971-999

DAEX

DISCONNECT & EXIT request made only by
the REASSIGN MCR Function. This occurs
after all LUNs are reassigned away from
the Line Printer.
until the Handler
honors this function, the line printer
cannot be resurrected (reassigned back
to a LUN) because the assign inhibit
flag is set (by REASSIGN) in the line
printer's Physical Device node.
First,
the I/O request node is returned to the
Pool of Empty Nodes
(lines 971-975).
Then, the line printer is disabled and
the
Handler
disconnects from
the
interrupt
line
(lines
980-981).
Finally, the assign inhibit flag within
the LP Physical Device node is cleared
and the Handler exits (lines 995-999).
Interrupts are inhibited briefly so that
the Handler cannot be interrupted after
clearing the flag but before exiting.
If this
were
not
done,
REASSIGN
(assuming it was given a priority higher
than the Line Printer Handler) could in
XI-4-6

Line Number

Description

Label

theory request the Handler while still
active.
Note that decrementing
the
transfers-pending count (as is done at
line 957) is not necessary here, since
REASSIGN is not a USER-mode Task.
1003-1034

INT

This is the interrupt service routine
which reads the status of the line
printer (always nonzero) and saves it in
the
Handler's
Event
Variable.
A
Significant Event is then declared and
return given to the interrupted program.
The
Accumulator,
the
only
common
hardware register used, is saved on
entry and restored on exit.

1036-1085

XADJ

Variables, CAL
error messages.

xr-4-7

Parameter

Blocks,

and

PAGE

RSl(

LIN~

PRINT!:R HANDLI:R
• TITLE RSX LINE PRINTI:R HANDLI:R

I
I

2
~

•

CUPYRIGHT (Cl 1!n~
OIGITloL EQUIPMENT CORPORATION, "'AYNAIIO, HAS,S.

I THIS SOFTWAIIE IS FURNISHEU UNOEI< A LICENSE FOR USE UNLY
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'1
8
SI

TI1E INCLUSlON OF THI: ABOVI: COPYRIGI1T NOTICE.
THIS
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1 O~ ITS sonll"'E ON EQUIPMENT WHICH IS NUT SUPPI.IEU tly
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1
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Ie
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12

13
14
1~

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1'1
18
lSI
211

21
22

PAGE

LP.~2

SIIC

RSX LINt PRINTt.R "ANDLER

24
2~

21i
27

28
211
30
31
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3'
35
36

37
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8/2lil173
11/C!5173

EDIT "23
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full "2:>
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EDIT "031

1/9/74
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2/2174
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5/2'j174 SI,;!i

EDIT "032

~/917:>

II/C!517~

3111 APR 72

"2'

~II

40
.1
'2

CUPYRIGHT

1971, 1972, 197-"

"..111

S. ROUT
G. LOLt , S. ROUT
S.R(;Or FIX roo SHORT LINE
H. IIRt:JCI
C. I'RUltAU
II. A. IJtSlMUNt
SLR CLEANUP
SCII CLtANUP
SLR CLtANUP
AI'I TlUP VEI,;TOR NUl1t1EH t.RROH
FIX NO Oil EXIT PROtlLEI"I
FIX II"IAG MOUE COUNT
PuT L'IIIf ~EtO I:I~CI\ FO" L>C1:1 IMAIit. "'ODE
"",31'1 HAD A HU",-OOIjN PROIILtM, HE Tlit.NCH
TO 029 MOSTLY
MlSSING UlSCLAI"'EIi

1974 UIGITAL tQUIPMtNl CORP., MAYNARD, MASS.

••
4'

'5
'15

•8

~II!

51
52

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515
57
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511
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70
71

I'IUIJI~ ICAr IONS

FOR UI,;15 UNICI1A"NEL LINE PRINTEHS

I'IHI:N THI: ASSEMtiLY PARAMETER UC15.0 IS SUPPLIED,
~O" THt: UI'fICHANNEL PRINTtRS IS CREATtD •

IN TI11S CASE THE INTt.RNAL BUFFtR IS PAClltO Twa CHAR'S PE'"
I'IORD, RIGHT JUSTIFIED, WITH THt TWO TOP BITS UNUSt.O.
THt flRST CI-uRjlCTEN GOES ON THE RIGHTI, THt St:I,;ONU ON THE LEFU
tRROR CONUITIONS ARE ENTIRELY HAI\IIJLED ON THE pUP-II SlUE. TI1E
POP-15 SlUE HAIoiOLEH ASSUMES THAT THE OtVICt NEVE'" MAI\ES AN
EI<RORI SOI'l~ OPEHATIONS JIJST hilt: jI WHILt TO COMPLEH. fHRQR
MESSAGtS ANE PL.ACED IN A TAIILE 11\1 TH!:: pII<EX-l1 EXt.C. A
SEPAkATt: T~SIl PRlIIITS OUT ANY Et'RUR ~ THAT O[;CUI'I. THE
POP-I t I1AI'fOLES TlMEOUT IJIIITlL OtVICt READY.

IN ORDt" ~OR THE U1:1:> HANOLEw 10 ~UNI:TlOIII PROPtRLY, THt
PDP-11 MU:'T II!:. ABLE TO ACCESS OUI< INTEI<NAL tlUHtl(
,AND TCb'S. THIS MEAIIIS THAT THEIR AUOHt.SS "'UST tiE LtSS THAN
2811 TO n,~ PDP-ll. THUS. IF Hit POI'-l1 LOCAL MtMORY IS 81<..
THIS HANOLtR MUST "'ESIOE BfLOw 2111K IN PDP-l:> CUlltl THIS IS
tQUHALt.NT TO 50"'90 OCTAL. SIMILARLY, IF THt. LUCAL
PDP-II Mt.I'IOIIY IS 121(, THt. "A~OLE" MUST RtSlUt bfLOw
4011'1!10 OCT"L.
STANO.HU SEkitS pWINTt,RS

7.
75

vEl/SIaN

TH'IS HAIoij)LtH DRIVES THE Lt'I!l PRINlEH St;i'CltS.

XI-4-8

IT Hi

PAGE

76
77
78
711
811)

81
82
8~

8.
85

RSX LINt. PR INTER MANDL.ER
COMPATI8Lt. wITH NORMAL OUTPUT FROM MACRO & fORTIUN wRITTEN
PfiOGRAMS.
TU SATIS~Y A PHINT HEQUt.ST, TilE LI,.t. IS MOVt.U TO A tlU~Ft.H IN
TME H",NULEH TASK SECAUSt iT MAY HAYE TO SE MODHlt.u (IF NUHMAL
fORIRAN OUTPull, AND SECAUSt. A NOI/MAL MUOt. REQUESTOH MUST
NUT BE "BL.t. TO MOOlfY THE LINE AFlEH THt:: MANUwANE HAS BEGUN
TU READ IT (TME LP15 CONTHOL.LER UNPACKS 517 ASCII CHAHACTEHS
UNTIL A Vt::HTICAL CONTROL CHARACTER IS FOUND).

AL.L

87
88
811
118
111
112

12 (LINt. Ft.tD), l ' (FORM ~EED), 21 (OOUtlLt- SPACt), OR 211)
COVER PHINT) 15 PRECEDED tlY A LINE FEtO, AND PNINTfU IN

!I~

II.
95
96

97
Sl8

1111
100
101

IMA"E MODE OUTPuT AND ASCII OUTPUT NOT St."lNNIN!> IIIlTH

SINGLE LINt. MOOt..
FOR AsCll MODE OUTPUT BtGI"'NING WITH 12, 14, 011 21 (FCIRTRAN
01S OUTPUT], THE HIGH OHDt.R HEADER HALFWOfiO IS SET TO TIilO (TO
INDICATE TWO "LINES") AND THE LINt. IS OUTPUT IN MUL T IPLt.-L.INE
MUOE.
FOR ASCII "'ODE OUTPuT Bt.GINNING llilTh 211) (tORTRAN OTS OUTPUT TO
O~ERPRINT TilE PREVIOUS LINE], THE HIGII OROER HtADt.R HALFWORO
IS SET TO T 1010, THE 2111 IS CHANGED TU A le. (CARR lAGt. fiETUHN,
WHICH IS EFFECTIVELY A NOP), AND THt LINE IS PNINTI:;O IN MUL TIPLt.
LINt. MODE.

1IIl2

TIIERE ARE NO IMPOSED PA(;E EJECTS AT PAGt. SOTTOMS.

103
lU
105

THI: FOI.L.OlollNG CAL PARAMI:Tl:R BL.OCKS ARt. uS to TO UU~UE NEQUESTS FUR
Pf(IhTER S~"VICE:

106
U7
108
1051
110
111
112
113
lU
115

CPS

Ct>s

(HINn

2411)0

ATTACH PRINTER

2100

PKINT LINt

t.VA
LUN
MOOt.
LlNt

117

122
123
124
125
126
127

HANDLER INFORMATIUN

EVA
L.lIN

116

118
1151
12e
121

3ti00
EV
LUN

CPS

2500

atTACH PRINltN

tVA
LUN
TilE R~QUt::Sl0RIS EVENT VAIHA8L~ 18 CL.E"R~D (lEHO~I)) !oIIiEN THE REQUEST
IS IilUEUEO ISY TilE "QUEUE 110" DIRECTIVE.
IF THE REQUEST CioN ElE
PERFORMED, THE EVENT VAI/1ABL.E IS SfT TO ONE (+1] UPON COMPLt.TlON.

XI-4-9

PAGE

RSX L.INt PRINTER tlA,.,OLER

128
1211

131'

131
132

133
13'

137
I"Vll.'l012
"'00111113

"'I1IP11I17
"'Vlfllt PI 1
"'01"102

143

"101)1103

1'4

",00111"4

145

"'011!107

1.6
147
148

14g

"0"'123
PI1I0I240
"01"252
",001325

1~'

"'01.'1332

1~1
1~2

-I!

-II!
-24

136

I
I

135

13i
1311
141'
141
1'2

It- THE REQUEST I:UNOT til: PERFOR"EO, THE EVENT YAR UIIL.I: IS SET To ONf
Of THE ~OL.LO'IliNG "IEGAllVE VAL.UES:

-40
-203 -

I
X12-12

XU-13
X17 8 17
Rl-101
R2"1I1l2
113-103
R.-Ie.
N,Du-U7
SNA"·123
PUOL-2'0
POYL-252
ALAO-325
DI.AU-332
DgRg-331
YAJX-3.2
IutO-345
D"T"'-361

"111111337
"0913.2
"'0111345
",IIP3til ,

155

II!l1Il'Pltil

o. no-10

1~15

'"0"'01"2

LUN-2

1:17
1:18
158

"'011!03~

"'lllI""'34

NCAa3.
CAA-35
L.PPl-71i!65'1
L.I'P"-106521

1~'

use

71118541

1151
1152

7il6521

7015552 A

L.I'RS-7e65~2

1113

70(1154. A
7111f15til
711H'i1!21
7"'III!'1

LPEl-706544
LPDl-7Vl6561
L.PCD-706821
L.I'CS-"6641

111.
1155

1116

187
itl8
1611
17.
171

172
173
174
175
178

177
178

178

705522
71115521 A

.lNI1-71/J5~22

.I:NS-705!121
I
I
.1FOtF

IL.LEGAL REr.lUtST FUNtT IUN
IL.L.EGAL OAl A '"'ODE
IL.I.EGAL UUTPUT "EADER wORD .. PAIR-COUNT « l )
L.U'" "AS tlEl:N REASSIGNEo WH1L.1: RI:r.lUtST ",AS IN [,IUEuf
UUT-OF .. PARTIllON TUI'ISI'EH (NORHAL. I'IOUt:)
lL.LEGAL. TO ATTAtH tiR OtUCI1 ~ROM UTHtR THAN TASK L.I:VI:I.
IAUTO-INtHEI'!ENT RI:G 12
IAUTO-INCREMENT REG 13
IAUTO-INtREI'!ENT RI:G 17 (USED TO SET RtQUESTOIII S EYl
IRE-ENTRANT RI:GISTEIoC ONE
IRE-ENTHANT REGISTEH TWO
IRE-ENTRANT REGlSTEH THREt
IIIE-ENTHANT Rt:GISTEw fOUR
INODE AUDITION ROUllIIII: ENTRy PUINT
INAME SCA" WOUTtNE tlllJRY POl/lIT
IL.ISTHEAD FOR 1'001. uF EMPTY "lOUtS
1L.18THEAO FOR PHYSICAl. DEvItE L.IST
,ATTACH L.UN & DEY ICE ENTRy POINT
IDElACH L.UN & DtY1CE ENTRY POINT
ILlE-QUEUE REQUEST E"TRY POINT
IVERIFY & AUJUST I:NTRY POINT
IDECL.ARt: 110 REQUEST COMPLETE ENTIn I'OINT
IDElAC" & EI'!PTV QUEUE ENTHY POIIIIT
IPOSITION 01' TRIGGER ~YENl VARUIIL.E IN PDVL. NODE
fL.UN fOR NOT .. READY MESSAGI:. (L.UN 3 NOT USEO SINCE MC!'I OUTPUT
ICOUL.D liE tHANNEL.ED THRO LU" J)
INORD COUNT AUDRESS (NOT uSli.O IH L.P CONTROL.LEH)
ICURRtNT ~OURESS "EGISTER ADDRUS
IPRINf ONI: L.INE
IPRINT MUL. TlPL.E 1.1Nt
I!'IEAD L.P STATUS
It:NA8L.E L.P INTERRUPts
IDISABL.E LP INTERRUPTS
ICL.EAR L.P DONE FL.AG
ICL.EAR I.P STATUS AND UROH "L.AGS
IIN"IIIIT INTERRUPTS
ItNA8L.E I"TtRRUPTS

UCle>

,
UIUATES FUll UNICH1NNEL. PHINTERS
I
Al'nL. T-~6
APII. VL.-2
L.I'SI 8 AP ILYL.*0!0.70Ci 101
S10.U 10b0fU
L.IOH'"'060Ii1b

XI-4-10

PAGE

I.p.32

RSX L.INt. PRI NTER HANDLER

"Rt

1110
181
1112

CAP I.APII.VL.*~0+7If1iU'

183

Dt.Vt;OOa,

I
• JfU"'D

NCSPI.
IDEVICE coot: IN PIR~X

.lfDt.f
Dt.VCOD a 21'
.t.ND!;

187

188

NOSPI.

12010 BIT

~Of(tllDS

.DEC
.lfUNO

I
I
I

1113
111'

ILINE tluFf Ef( SIZE HAY

L.tlZ

LISZ a 13.

ICONDITIONAL ."SSt.l'ltlI.Y,

lSI~

I
II'IUST tit: IEV!:N
.U'Do;
.DCl
UCI:;
.!fUND
I.tlZX a l.8Z/2*2-I.BZ
, JfNlR
I.llh
.t.ND -- I.IlZ MUST tiE EVEN

1117

1118
11'0111001 A

lSlSl
21e

211

212

2215
2215
227

228

'L.ISZ'

,!:;NDt;
1lI1'l!'l0Q1111 R

L.ISFs.

I
I HANDI.ER INITIAI.IZATION
I
STA~T

111111111111111
911111111111

~0"'e27

111111111,,,
11111111'1/13
111111"'1'1'

~I1I(II1'l30

.. 15p-1I2'

I1IIIUIIII~

III1!1'I1I2~

1110111011
IllI!1 III 07
11101/11111
!/IlliCIt I
11101111'

",.111581
723010
",.".562
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'8101550
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1100032
"'150!!152
!'Ifl0!033
,.111031

R
A
R
R

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111111"'21

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A
A

A
R
R
A
A
"'111552 A

2211

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OAC*
L.AC
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(Rl)
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(H2)
L.SNAM

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OAC
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+0. TG
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)(17, XR. & AC AHE AI. TERIiO)
INOUE FOUN01
IND -- EX IT
ISAVE pavl. NOUE ADDRESS
lAND
/TRIGGER l'Vt.I'fT VAHlABLE ADDMESS ADDRESS.
ICONNECT lN1ERRUPT I.INl'
ICONNt.Cl OKAY?

(10)
I.TG
PDVTA
L.7001111J

INa -- t.XlT
IYES -- SliT THIGGtR EVENT VAR 1 AIlLt. ADDRESS
liN PHYSICAL DEvlt;E NUDE
IDE rER"'INt ·XH"AOJ •

.II'UNU

ISCAN PHYSlt;AL. DEvICE LIST

"''''1112' ~ 7015621

LPCD

fOR NODE

If OR THIS DIiVlCt..
I (Rl, R2, Rb,

XAOJ
UC1:;

230
231

HOIiIEvtR

"GUAMU 1I0MU· PROTECTlON 10 1I0RI\).

213
21.
2U
216
217
218
2111
221
221
222
223
2U

(fO~

VIA

IMAliE

.1:. ... 01;

212
213
2U
215

211

liE CHANGED

POP-15 LINE PRINTERS MAY HAV~ "'AX Uf 132 CHAR '5 IN

1116

SPDOL.llltli

.END~

18e
lee
lSI 1
lSI 2

2117
2U
21111

If I)PUOL.ING AL.LOWt.D

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18'
1815
186

1L;I.t.AM L.P CurHRULL.ER

XI-4-11

RSX LINt. PRlNTER HAI'<OLEH

PAGE

LPCS

232
233
23.
2315
236
237
238
239
2'0
2'1
2.2

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UC15

JMS

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2'3
2"
2.5

ICLtA" OUT OEYICE, UlT FOR COMI'LtTE
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II'OP~l1 SIGN " n TO OURS
15K IP IF PHOtlLEM
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/TYPEU, NOlO ExIT

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C"L
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(10

211'
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271110

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2'7
248

Ml)II'<lT

249
250
251

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EV
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252
253

111111 MS
I

254
25~

"'14411''''2, 000iHiJ01 .ASL;II

"*** 1110 LP IN I'IRtX"<1:i~

256
257
258

111'''''24

259
25",

1110"'25 ~ ,4 .. ",0i1l A

0100121'1

"'0~01!1'" "

251

25!5

256
257
258
259
270
271
272
273

275
276

217
271j

279
280
281

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nun FOR Hl1l>GER

252

253
25.

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I
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!II1lI"!27

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"''''''':H

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.. ",1.'11'3 A

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IPOINT TO fofA"IULER 'UME
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/ADOR OF OUJ TRIGGGER
II. IT ERAI. f OH XR AUJUS TMENT

ItNU OF 11'<11 IAlIZ"TlOIII COUE

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.... ,.,. ........ ,. ...... ,. ...... Tt-tE AtlOYt CODE IS UYER- " ............ " ........ " ........ ..
,.,. .. ",.,. ........ " ...... ,. .. LAYEO tly OTS ASCII LINtS ........ ,."",.,. ........ ,. .... ..
01141111:i

282

XI-4-12

IIWARO 1>101010 CONTAINS A CAHIHA'"t R~TURIII (1:i) L.INf
ITERMINATOR FOR BOTH ASCll & l"'AG~ MOOE LINtS.
ITS
IPUHPUSt 15 TO STUI' THE L~ 1:' I:ON1HOLLtH HAL. INE

PAGf.

L.P.32

SRC

RSX

L.lN~

PRINTEfi "AhllL.EH

283
28.

IDOES "lOT CONTAIN A VERTICAL. CONTROL. Ct1ARACTER
IREQUIRED TO STOP THE CONTROL.L.ER ~ROII fETCHl"lG
IDATA FROII CORE •

285
2815

• ENOC
.1FO~P

287
288
28G
211e
2111
2112

PUTP

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TO SIGNAL. T"AT A REQUEST HAS IIE~N QUEuED.
I

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CAL.

WFTCPII

.1FUND

UCU!

THE HSK HAS IIEEN
0101' 1111 '" , '1,11580
1IJ0~11 D '1111115151

TlilGG~R

EVENT VARUIIL.E TO liE SET

PI.!

DZII
L.AC

TRIGG~RtD

TG
POVN'"

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ICL.tAR TRIGG~H
IDEYUE A f<EQUEST

311J5

.ENDC

311115
307
308
3f1111
310

.IFD~F

UC1!S

311
312
313
31'

L.AC
TG
OZM
TG
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SPAjCL.AIlAC
JMP
PQ1

315

316
317

318
311l
320
321

322

PU1

323
324
325

326
327

IwAlT FOR

zgG

3111.

L.~Z/2+2+L.IIF-.

.~NOC

2113
211.
2115
21115
2117
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311JIII
3111
311J2
303

UC15

.tiL.OCII
III

SAO
JI'IP
SAO
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IA80RT till TO AC0
I:SKIP IF "'OT, SET UP 1 fOR COMPARtS
IPII,;K OFf AIIDHT IN NOR"'AL. "'ANNE~
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332

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XI-4-13

RU L.INt PRINTER HANUL.ER

PAGE
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IYES -- AIIORT TASK 110
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IYES -- DETACH & tXIT
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II-4-14

PAGE

lUX LINt PRIIIITER HANDLER

IIIRe:

LP.32
Gl01l15!!

(R2)
ATTOET,x 1(113, 1/4, 115, Nil, Xlii, X11, xR, & AC AkE AL.TtRtO)
I 101 AS LUN DEl AeHt-O',
JIIP
SEV
INa -- SET IU:;QUESTON'S tVtNT VAlUA~L.E TO -24 DR -2111"
CL.Ajl~C
IYES -- SET Rt-QUESTOR'S EVENT VAHU~L.t. TO +1
JIIP
SEV

10""'"24
41"'2112

Gl0~!511

1110'-157 "
(IIIII~I!III

1111'1'-61

110"'373
7""'0311
110111373

SPi
f(

I
I
I
C!l0?62 II
1lJ0'-fl3 II

R
12[11636 II
j 2916315

IIONITOR SUBROUTINE C~L.LS FOR ATTACH-DETACH

AHIlE T

Jllh
Jllh

(ALAD
(OLAO

I
I

I RtTURN tUNUL.EII INFORIIATlOt<l 1111 EvEIIoT VARIABL.E
I
1IJI'I'64

1IJ1ll1lI1I!l

'091631
MJ(II37J

HINf

LAC
JIIP

(111101'111)
StV

PRINT LINt
.IFUIIIO

UC15

LAC
OAC
AND
SAO
JIIP
LAlli
Jill'

1,X
ISAVE 1I00t. I"lOICATOR
III
(771716)I1F DATA MOllE IS DTJoIER THAlli 2 (ASCII)
(01110002) lOR 3 (IIIAGE), sn REQUESToR'S EVENT
IVAllhBL.E TO -1
.+3
-1
SEV

I
I
'1'1!01/)1
111(1.11'"11
1111110117
"""'5S11
~1II1!'1540
111027111
IIIGB!7t II ~4!l11141
1100275
0""7,- II
777771
110"'373
0111'74

PI(INT

1II0,n

.ENoe
.IFOt.f

UC15

LAC
OAC

2,X
STLA

I
PfotlNT

IREMEMBER 1010 ISSuED I"RIN1

SORRY ~~OUT IIIEXT FEW, DATA HOOt MUST Bt 2 OR 3'
PUT IN III II NOP FOil MOllE 3 AIllO St\lP FOR 1100t 2
LAIJI
TAil
RARjeLL.
SNAIWAL
JMP
LAW
JIIP
SIoIH"
lIOtl
O~C

.. 2

/A~O

1111 "'Oot- TO Gl Vt II all

7,X
.+3
-7
SEV
tSKP
III

III IN AC IF ONLY IF L.EGAL. DATA 1100E
15KIP ILLt-GAL
INOIJI AC III FO~ ASCII, 1 FON IIIIIGE
ItRNOR X IT
If ON ILLEljAL. OATA IIOOE
111111/1111 FOR IfIIAGE IIOOE
ISKP OR NOP AS REQU~STEO

XI-4-15

LP.~2

'IRC

Q!\lI?7!!
00'7111
AQl?""
1'''''31111'1
(/JilJI'!I

AI1!~/)I'

A0~"'~

111111..,""

'11101557 H
1)16C'1624
'1 111 011'
",6"'642
1)14"'563
75"'030
/)1601643
, 2"'644 R

AA~I'!~

~1!"'372

otl'l~"'1'1

777777

~601642

"'1II~P7

010..,1(11

"601633

1110~11

IIIA~l'

D
D

"'ot~l~

010314
1'10:>11'1

'2"'11112
(114"'I1'P'"
~4"510
1I!0C1!6'~
"'6,"64~

1l!0321

72377b A
740111'10
""0",323
717762

OIil~2'-

1'!00137~

01'1311'1

01'1~17

ilI"'~201

00~23
0I11I~?4

iii '0"'56~
II 1116"'642
12015.4

RSX LINI:. PR INTER HANDLER
,t::NDC
LAC
OAC·
LAC
oAC·
oAC
CLAllAC
oAC.
JMl:j.

RN
(R2)
1i!I, X
(R3)
TEMP1
(R4)
(VAJX)

JMP
LAW
TolD"
DAC"

ERR3'"
-1
(R3)
(X12)

LAC.
OAC
LtlS

X12
LBF
10
(176)

AI,O
OAC-

(H4)

UC
Si'lA
JMP
LollIII
JMP

-2

LAC
OAC·
JMS*

TtMPl
(R3]
(VAJX)
ERR31/1

.+~

-16
SI:.V

1l!0~2'1

OIQI~2f1i

iii

flip0I372 R

J",P

"'0327
"';1133'"
011'1:>131
1!II!13'

,201643 F<
741)10~1 ol
"41l!563 Ii
72~21'16 ol
"''''11110 A
""01"'337 R
777572 A
"'4"'563 R
,I'I!lIt;.b R
"6"'641 lot

.IFUIliD UC15
(R4)
LACTCol
OAe
TEMPI
AAC
+LHZ
SMA
JI'IP
.+3
LAW
-L8Z
TEMPI
O.C
(LBf)
LAC
(XI3)
OAC ..

01/113~

011'1113'
ilIl'I:53!!
0103311

1:1
D
1:1

A"'~37

1111'134(11
1'111111',
OIOI~"

01111"3
OII1'~'A

D
1:1

,2t;11i!112
"1501f'!13
.4015113
'11l""~41

LAC.
OolC·
ISZ
JI'IP

X 12
X13
Tf::MP 1
.-~

XI-4-16

PAGE

lUX LINt:. PRINTER "ANDLER
1110345 p 75"'030
01111:'14" II 1 i1I1'147!1

CLAjlAC
JMS
SEVRN

, 1II1lI!5 !56
(lIPl3A'
"!A\l!650
£11035"
1'0 1l1 37!1 I<
Pl0351
!!I1Il3!!' II 'Ill 010111 2 II
IlI035:'1 II '1I11M!51 II
1Il!!l3!54 II '14011152 R
OI!!IM!5
60"'''11 R
l1li4"'653 R
"':1135"
IlI"'357 II f1101i'1411 W
Pl0:'1f111! II '14"'654 R
1'0111411 R
"'Ill 36 I
Pl0M,
,,4 "'6!5 !I II
1111113113 II '41 III III III A
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111111311!1 II 'I0!l1656 R
IlII1I:'III' II '4"'657
014"01112
PlIII3''''
1'0"'411 I<
011137,

LAC
SAD
JI'IP
LAC
AND
SAD
JI1P
SAO
JMP
SAD
JI'IP
SAD
SKP
JMP
LAC
A""O
XOR
OAC
JMP
.tNDC

ILINE HAS Btl::N MOvED AND IS REAOY TO tiE
IPRINTED fROM INTtRNAL SUFFER, INUICATE
ITO THE REQUfSTIJR THAT THt LINE HAS SEEN
IPRINtED tlY SETTING HIS t:VENT VARIASI.E TO

1+1.
I'll
(3
I.f"PSI.
L.tlF+2

(77"000
(::1001110
PTI.
IYES -- PRINT TWO L.INES
(060000) IfoID -- FORM FtED l14)1
IYE5 - .. PRINT TljO 1.1"11:.5
PTI.
(1040011) INa -- DOUBI-I:: SPACE (21)1
PTI.
IYE5 -- PI(INT TWO I-INES
(10000111)//110 -- OVtRPfllNT (20) 1
INO -- LINE Ft:.ED , PRINT 5INGL.E LINt::
I.FPSI.
L.tlF+2
IYES -- CHANGt 20 To 1::1 (NOl" I-INE) AND
(ld03777) IPRINT TWO LINES
(06400"')
I.tll'+2
PTI.

UC15 StCllO'" TO TRANSFtR BUFI'EH

.lFOl:.f
I
I

UCI:)

t:.QUATES

I
I.INL.EN-I.BZ-2

ICHARACTEtR5 PER LINE

I
LAC.
XI2
(I.BI'+2
LAC
PUTP
OAe
(M4
LAC_
111
XCT
SKP
SKPI!,;I.I.IRAR
AAC
-1
CI'IAllAC
OAC
TEMPI
GETI~
LAC
OAe
GETSW
I.AC
PUTt'"
PUT5111
OAC
OIl'!
L.tll'
CLAI!,;''''
OAC
fIRST

IllMOVEll FMOM HEADER TO POINT TO DATA
/PUTTER PUINTER IN I"UTP
IHERE Is \IIOf/O COUNT OF BU~Ft:.R
ISKIP ASCll
'/iMlAI>E, SKlP TO SUtiTMACT 1
/ASCII, RtDUCt:. TO PAIR COUNT, SKIP TO TCA
IIHAGE, CORRECT FuR T"O !IIORUS IN t1EADtR
INEGATE FOR lSZ LOOP CONTMOL.. ISZ FIRST
IINIT. CHAR Gt:.TTER
/INlT CHAR PUTTER
IClotAN CHAR,aCTER COUNT
15ET UP FIRIIT SWITCH

XI-4-17

PAG~

RSX LINt. PRINTER HANDLER
DZM
JMS
I
I
I

TtMAR
RESETL

ISO IT ISN'T A CR IN CASE Of BLANK LINEI
IHESET LINE POINTt.RS

MAX"I LOOP TO TRANSfER CHAR'S TO "'''NOLER BUffER

MAIN

JP'lS
OAt
5NA
JMP
AAC
SNA1:1PA
JI'IP
SAn
JMP
SAD
JMP
LAC

GETCH
TCHAR
MAIN
-4e
MSPt:C
( 137

MAIN
(131)
UCL,Pil4
I!LANt<C

ICHMutTER IiETnR , LEAVtS IT IN AC
ISAVE IT
15KIP UNLI:SS ~ULL CI'1API
I!'IUL.L, IGIIIOI<E
ISE~AIlATE 11 ~XT' CHAR I S ~ RO'" CONTROL. CHAR'S
ISKIP ON REGULAR LHARS
IGO 00 SPI:CIALS
IHUt! OUT?
IlGNORE
IAL 1 MOUE
If~U of LlNt ON A~T MUUt
IUO WE HAvE PENIlING BLANKS/TAIIS TO St:NO

NOTE TI1'T 8LoIINKC HAS MINUS THE COUNT O~ CONSt:CuTlYf 8L,ANt<S
TO StNU. A HS IS CHAIllGEU TO CONSECUTIVE BLANKS SH,CI: THE
POP-ll HAwow"Rt DOESN'T KNO" A80uT TA8S.

MAINO
MAINt
MAINK

MIIINt:

SMA I !;LL
JMP
TAD
SM"j!;L,A
JMP
TAD
JMS
LAC
TAD
JMS
OZ'"
LAC
JMS
ISZ
J"'p
LAlli
OAC

15l
JMP
JMP

"'AINC
(2011
I'1AINO
(201!1

PUTCH
[2el!l
BLANKC
PUTC-H
I!LANIIC
TCHAR
PUTtH
TAllt
MAINE
-11!1
TABC
"'AXC
MAIN
UCLP04

ISKIP If ANY AT ALL
Il\iOPE, GO DO REIiULAR CHAR.
ICHtCK IF MORE THAN 127
ISIOP If YEs
INOPE, PUT OUT ONt. COUNT Of 8LANKS
IF IIIST Of TIoU COUNTS, 128
ISET uP BALA,~CE
IBALANtE ~OH TWO, ALL I f ONt ONLY CASt
IHESET COUNTER
10RIGINAL CI'1AIi.
IPL.ACED IIIITo tlUfFtR
IINCRE"'ENT 1 AI! COUNTER
IIIIOT OYER" LOW, GO ChECK
IFiESET TAl! COuNTtw

LIN~

COUNTER

II'1AvE wt RUlli uuT uf LI'It
INO
IYES, GO ~INISH UP, RESET LINt: POINTERS

/
:;PtCIAL. CMARACTEIiS
/
MSPtC
SlAll.L.AICMA
JMP
MSPt:.Cil
floC
BL.ANKC
OAC
BLANKC
JMP
"'AINI(
MliPtC2 L.IIC
TCHAR
SAD
(11

ISK1P IF IT IS ,. tll-ANK
INO~E, CHtCK FOR UTHEfo( THIN,"S
/AOO ONt: T U tlL.ANK COUNTER OS MINUS COUNTtRl
IJOIN L.IlI:t AIliU TAt! CONTROL. SECTlON
IGE T I:!ACK 010( lIiINAL. CHAR
I1S IT A TAb

XI-4-18

PAGE

I.p.32

SHC

RSX I.INt PRINTER t1ANOI.ER

l5al5
5a6
5117
sa8
5 lUI

J"'P
SAO
J",P

SAD

8l1li
1581
882
613
804
8115
816
817
818
81U
810
611
612
813
814
8U
818

MSPtC5
MSPEC3
MSPtC4

HCR

MTA~

817
818

8U
82111
621
822
623
624
825
626
827
628

,
I
UCI.PI1J4

UII
63111
1531
832
633
834
6315

,
RfTHY

1538
637
638
6311

U,
Ul
842
6<43
6<44

U5
846

,
OPDOHE

JI'IP
SAO
JI'IP
SAD
JI'IP
LAC
JI1S
JHP
LAC
JI'IS
J",P
JI'IS
I.AC
JHP
I.At
TAD
DAC
I.AC
CI'IAlhC
TAD
DAC
51'1 A
JI'IP
I. A iii
DIIC
JI'IP

'ITA~

(15
UCI.PIII4
(Ill!!
HCR
(14
HSPEC3
C21
MSPEC4
(12
PUTCti
HAIN
(12
PUTCH
"SPEC:!
RESETI.
(115
MSPEC3
USC
III.ANKC
III.ANKC
UIIC

IYUP, GO 00 IT
ICARRIAGE RE TURN
lEND OF I.INt. ON CARRIAG!:: ~t.TURN
IFORTRAN OTS LlYERI'RINT, DO AS CR
IfORH FEED
IJUST PUT IT OUT, fOR NOli
I~ORTRAN OOUIlI.E SPACE
IUD AS TWO 12'5
10EFAUI. T ON UNRECOGNIZED CONTROl. CHAR. IS I.INE FEED
IPL.ACE IN IIUFFER
IGO DO NEXT
l~lWST OF TWO 12'5 FOR THE 21

IGO DO THl: SECOND 112
IHESET UNE POINTtRS
ICA"'RIAGE Rt.TURN
IPUT CHAR AND 1.001'
IGET REMAINING COUNT !'OR 1 AIS
/AND ADO TO CUMUI.ATlYf III.ANK COUNT
lAND TO I.INE CHECo(EII

,"",XC
MAXC
UCI.PIII4

"'111'

TAIIC
HAIN

CL.A llAC
SEYRN
JM5
LAC
L~"
SZA1&;L"CMA
RHRV
JMP

ISKIP IF SOl'lE I.INt LEI" 1
INONE I.EFT, FINIS" UP, Rt::SET POINTERS
IRESET TA~ CIJUNTEw
INExT CHAII

If ROM USER tlU!'FER, SET t::v
ITHlS RETURNS NODt SETS tv tTC.
IIiET ttiAR COUNT
ISl<lP ON ZEfo/O COUNT, -1 15 II IILANK'
IGO 00 REGUI.AR
IMAKE COUNT 1 FOR Tt1E tIL. liNK
IPUTS A SINGLt ~LANII IJUT

I:iZ

L~F

JI'IS

puTtH

CI.AllAC
OAt
DZH
LlC
J,,8
JMP

POST
LPDON
TCIIP
LPIU
IOIFTGR

ICl.tAR INTERRUPT "APPfNEU
IpOINTER fOR PIREX COMI'IANU STlU"'G
,SENO IT
Ir.AIT FOR I"'T~ilHRUPT TO IOIAKt. US UP

POST
LPOON
EVl1
077777
(17l1lJU

IRETURNED FHO,", pop ...
ICI.t.AiI fL.GS
IPOP-11 STATUS
IIIEEp THE POP"'11 tlITS
lOUT OF POOL ERROR

DZM
DZM
LAC

."D

ISET POST, SAYS Wt'RE WAllING

XI-4-19

PAGE

R5X

L..IN~

PRINTER HANDL-ER
JMP
RTLSPA I WTR
DAC
JMP

647
648
6411

6l5fll
651
652
653

654

6511

656

I
I

657

658

6511

IMP~RR

660
661

664

11MPOSSI BL.E !::WROR

HOL.UI:~

CI'IARACTER UNPACK I NG ROUT I1\1E
THI5 ROIJTlIIIE

'OWNS'

THI: MQ

I
I

662
66;'
665

RETRY
IYES, GO TRY AIOAIN
IPOP-l1 SIGN ~lT TO OUR 51GI\I ~I T
IWEMAKE OHIG, COUt, SKIP IF UK
IMPERR
ISTURE' II'IPUSSI~L!:' ERROR ANU CONTINUE? I?
pg
1[;0 L.OOK fOR MORE WORK

CHARACTERS ARt: OI!TAINEO ~ROI'I X12 pUINTt:R. EACH CHAW
15 RETuRNtD RIGHT JU5TIFIED IN THE AC
TEMP1 HAS A MI111US COUNT OF THE IIUIW5 TO BE OtlTAINEO
~ROM THE IllipuT POIIIITER 1/12

I
I
GI:TCH

XCT
SKI'
JMp"

666
687

668

I'll

ISKIP If

IT IS A5L.Il

I(;ETSw IS POINTt~ TO COt<wt.Cl ACTION ON ONTHt.
It:OWRt:CT ONt OF THE F I VI: 1"'01J51l!LE CHAR' 5

6611
670
halo DO IM).GE MODE

671
672

673

ISZ

TEMP 1

674

SliP
JfIIIp
I.AC.
JMP

UCLP04
X12
GtTCI'I

InlllISH UP I'll COI'IMON

(177
GE TCH

It'OlNTEH TO tORREI::T At:TlON. INIT't.D fHO,", Iit.TIN
/l'ILI.EO IlY J!1S GE TS ... AF TEH t.ACH t:HAH
II::OMI10N FINISH UP, STRIP XTNA lilTS
IUUT

675
676
677
678

0711

Gt.UII

680

681

Gt. TLM

682
683

684

GI:UN

685

686

687

I
Gt:T1.I

6811

651",
6511
6112

GH 1

6S!;'

6114

6515
6136
6137

ANIl
JMP"

11 III IT GETSII TU POINT TO ~lRST CHAR ACTlON

GETI

INDIV11lULA CHARACTER ACT ION

688

6S!8

I SKP ON NOT THRU YE T
IUONE

Gt. T2

J/45

GETS,",

IAFIEH 5T~ t:!1AR, POINT ~At:1I

ISZ

TEMPi

IUU1 OF PAIIIS't
15K!P IF NOT
IASI::II, RESET I.INt. POINTERS ON FiUNouT
I~ IHST WORD UF pAIR
11NTO Mg ~OH SHIFTl"G

SI<P
JMP
I.AC"
I.Mg
I.L.S
J,..S
I.LS
JMS

UCLP04
X12

TO ~Iwsr

7
G~TSW

7
GHSw

IUONE, L.EAV~ POINTER fON SEt:OND CHAR
IliEt:ONO CHAR
IL.EAVING pOll<TEI< ~O~ THIIIU

XI-4-20

PAG~

egll
1111111
11111
71112
71113
1U
71115
71116
707
71118
7l1l5I
710
711
712

7U
711
71!1
716
717
718

1!1

~SX

L.INt PRINTER HANDL.ER
GtT3

GtT4
GtT:!

L.L.S
DAC
LAC.
LIIg
LAC
LL.S
JIIS
LL.5
JMS
L.I.S
JMP

I
I
I
I

I
I

I
I
I

AND

lSZ

123
724
725
726
727
728
7211

JI1P
SAD
JMP*

lSZ
J"'P*
PuTSW

745

748
,.411
7!10

(377
FIRST
.+3
(12
PUTCH
LtlF
puTSW

JMP.
I
PUTlN

PUTCH

ItIGHT HITS REMAIN
100N'T SEND A L.EADING LF. POP-ll PUTS ONE IN
INOT fIlISl TIME. SKIP H.Sf
/15 IT A L.INt: FtEu
IYUP, DO NOTHING
ICDUNT AN OUTPUT CHAR
1100 DO FIRST UR SECOND CHAR
IlNITlED AS PUll. FIL.L.ED L.utR tlY JI1S PUTSW
IDONE, RETUkN
ISTART AT FIRST CI1AR

PUTt

PUTQ
Pull

135

7.6
747

IIUCK TO TOP fOR POINTER TO 1

Ii!

722

,.4.

IL.EAV ING 1'011

GETQ

TWO CHAR Iii PER WORD fORMAT. FIRST CHAR IS R IGH T JUST IFlfO, SECOND
IS PL.ACEIl IMMEDIATELY ABOVE FIRST, L.EAVING TOP TiIIO BITS Of WORU
UNliSE D. el1AR IS DEL.EvEliD TO US IN AC. IN IT PUT SW By OAC I INIi CONTENTS
OF PUTIN INTO IT. ROUTlNt COUNTS THe: OUTPUT CHARS IN PUTCH

PUTCH

738
137
138
7311
7'1/)
741
742
743

,.GETSW

CHARACTER PUTTER FOR PDP-II

720
721

731
732
733
73.

litTSW
3
GETSIII

/THE HAL.F-AND-HAL.F CHAR
IVERY TEMPDIIARY
ICAN'T END IN MIDDU Of PAIII
ISECONO WORD TO SI1IHtH
ItlRING tlACK FII1ST
ICOMPLETE CI1AR
IL.EAYING POINTER TO FOURTH ACTlON

7ie

731/)

•

GETSW
Xl2

JMS
DAC*
JMS

PUTSW
PUTP
PUTSw

IL.EAVt POlNTER FOR FIRST AFnR StCONO
IHRST CHARACTER .CTION, "LACE RIGHT JUST lflEO
IL.EAVING POINTER fOIi SECUND

PulO!

CL.L PIWHA
Rofoli
leUR.

DAC*
ISZ
L.AC

SAD
JIIP
JI1P

IPUl CHAR IN HIGHT PL.ACE
PUTP
PUTP
PUTP
PUlP
(PUTP
UCLPIIl4
PUTQ

IPUT HAL.VES TUGETI1ft<
ItlOlH 1111 tlU~"'ER
II'IOYE POIIIITt~
lOUT OF BUFFER CH~CI\ If PUIIIITt:.R PUlillTS TO
IUUl OF SPA(;t!
troD Tt.LL. PUT Sill

THAT PUll U

iIIEx5T

foIESETL
THIS ROUTINE RESETS THE POINTERS TO THE SEGINNIiIIG Of

XI-4-21

A L.IIIIE

St.L.~

PAGE

115

L.P.32

~lir;

RSlC LINt PRIIHtN HANIlLER

751
752
753
75.
755
756
757
758
758

R~StTL

711e
7111
7112
7113
711.

FIRbT
Ll .. LI"
'UXL
TC;HAR
BLANKt
UBt
STLA
I
I
I
Tce
I

7115

7116
7117
7118
7158

77 III
771
772
773
77~

775
776
777
778
778

II
LAW
OAt
oZM
LAC
OAt

-18

18 SPACES PtH TAB

UBC
5LANKt
LINLI"

/THt POP-ll OOEs"q KNOW ABOUT TAl!S
IZENO COUNT Of COl'oStCUTIVt ISLANIIS
INUI'IBER O~ LHAlUCTEkS PEN LINE

"'AXC

J"P.

REStTL

I
I

IlNlT To -1 TO SHUW flRST tHAR.
ICOUNTER f DR "AX LHAR I S PtR L.INt
100 ISZ ON L.INLIi'! COUNT HtRt
ITE"PORAIU fOR HOLDING CHAR
ICOUNT OF CI.INSECUTIVf BL.ANKS
'''ODULO 8 COUNT wHfNE NEXT TAl! GOES
IREI'IEI1BER WHO IS uO llllb PR 1 NT
IASLI1 SKIPS, I MAGE OOtSN IT
~ OR

StNDING BUFFtR TO POP-l1

TtB
EVll
SUDO
LPIOT
STATUS

/TELL. PUP-l1 "HtNt TO StHU HHERNUPT
IPINEX UEV ICE tOUt
It.VtNT VAHAIBLt fROI1 PIREle

APUL. Y..Qhil+APIL.VL.
OtVCUD
III
III
L.l!f

IPERHANtNT BUFfER ADOR
IhOT USED
IhOT UStO

111

III

Tts fOR SlOp 110 TO LINE PRINTtR DRIVEl(

7ell
7111

782

783

I
nBII

III

784
785

EvllK

Ot VtUDEU 77""1iJ+2~14
8

786

787

788
788

I
I
I

POINTERS TO TCIPS

TCBP
TC8KP

1911
791
792

I
I

793

7941

L.POON
POST
I
I

795
796
797

LOCATIONS fOR UC15 VtRSIUN

798

799
UII

LPlu

81111
882

Tt8
TC811

11 IOtHtN OPERATlUNS fINISHtO, OTHENIHSt. til
11 "'HtN IIAITING fuR INTtNHUPT. OTHENIIIISE II

"
"

EVll
EVllK

ISU~ROUTINt TO SEND TO PDP-ll
ItLtAR kETURN VARIAl!Lt
/ANI) THE OTHER ONt., IN CAli~ 11 USED
ISKIP H PDP-ll CAN TAKt 1T

XI-4-22

PAGE

RSX LINt PRINTER HAI'IOLER

'1RC

I.P.32

803
814
80~

806
817
818

.-1

JMP
I.IOR
JI'IP.

LPIU

0
OZM
OZM
LAC
JIIS
CAL
J"P.

POST
LPOON
TC8KP
LPIU
IiFCI.ER
CLEAR

INOPE
lAC POINTS TO INSTRUCTlOIII I. 1ST
/THAT'S ALL

I
CLEAf~

8ee
810

811
812
813

8141

81S

816

iIIfCLER

817

1!;l.tAR POST,LPOON,PIRf:X

20
EVll K

ITELI. PIREX TO CLtAR
IPIREx RELl SENDER
IwAIT FOR PIREX COMPLETION

IlIIAll fOR PIREX Ttl SET EV fUR CLEAR DEVlCt:

818
ate
820

821

Pl1ll37!!! 11/ 777750 A

ERR31il

.ENO!;
I. Aill

-30

822

823

I
COMMON TEHMINATION 01- NOh-PRINTlhG REQUESTS
I
SEVWN
ISET EVENT VA~IABLE, DECAL HE SIGNIfICANT
St.V
JMS
JMP
I'Ll
IEIIENT, RETURN NODE, PICK NEXT RELl.

82.82S

826

Pll!l373 III I 0il'-7~ R
Ple3" I) "I0Pl211 R

827
828
8U
83e

831
832
833
834
835
836
837
838
83e

8·1
8·2
8413
8,..
U~

846
847
848

8se
851
852
853
85.

SECTION fUR PDP-15 PRlNnRS
I
I

Pl037!5
1110:01711

'0Pl5!56 R
""''''01110 R

I LINt. FEt.1l •
I
LfoPSI.
LAC
OAC

PRINT SINGLE LINE

"1
I.dF+1i!I

ISET MODE IhDICATOR 1111 HE,lDtR (UNPACKING
IHARD.ARE IGNORES HIGH ORUER HEADER HALF WORD
IWHEN PHINTlfllG IN SIIllGI.E LINE MODE).

LAC
JIIS
L.PPl

(LFI.)
PRNT

IPRII'IT LINEFEEO 1.1NE

711!1I5.1 A

IlIIII.III' III ,f/JIlI6.b R
IIIIUI'I3 III 10"'11 R
PlIUU III 70115.1 A

L.AC
JMS
I.PPl

(I.IIF)
PRhT

IPRINT REQUtSTEU L.INE

JI'IP

PLl

IPICK I'IEXT RELlUEST

1!I~20ia3

ILINEFEED L.INE

1I!11I377 II '01'1650 R

Ill"'."'"
1II1t1.I1I1

1001.17

"\UI1!!I III "101'1211 R

I
PlIUQlII III ",0?I1IPl3
lI!eU7 III "'1'10101110

IIIIUtlll

II'

"'091012

I.FI.

0000"'1il
11100012

PHI"'T TIilO I.INES

XI-4-23

PAGE

8115
8116
8117
8118
85S1
88e

881
882
863
85"
865
886
8117
8118
86S1
870
871
872
873
87"
875
876

878
8711

88e
881
882

883
88"
88l!
81!16
887
888
88S1
811e
8111

RSX LIN~ PRINTl:R HANDLER

I
"'0'1!

"'''''Il)

8S16
8S17
8S18
8S1S1

lIee
901

902
903

ge"

Sle5
Sl06

,o016111

""0I0~"

01111.14

'011111.6
111101.17

OIQI,!!! II

7~1I5'1

"'0.!:!!

(1il02002)/AL.TER HEAD~R TO INDICAn. TwO
L.IIF+e
IASCII "L.INtS".

PTL.

l.AC
JMS
L.PPM

(L.IIF)
PRNT

IPRINT IIOTH "LINEs"

JMP

IPICK NEXT REQUEST

I
I

QlIU! 7 II "'01111/l~0
0111142111
1 .111.52
'fIU21
723777
II ",.11155'

PI,,,..,,

"'1lJ'2~ II "'5"'662
0111142' II 1 6"'15113
42 01 4P'
1110'21!
,.11155!)
110.27 II 7065"" A
11111143'" II 10",.!!3 R
lIIe'2!'!

"'0'~!

I
I PICNT -- SUIIROUTlN~ TO
I IN "C, AND THE lOT TO
I
PIINl
PRNTEF
-1
CAliF
(CAA)
PICNT 1
(foICA)
PHNT
f.:V

,011155!) R

PI".. 3'
1110'33
"'lIlA 3'
"'0'3!'!
(110'3/5 II
",e'37 II
Gl0441'" II

"10066' 1/

7't20"
1101U!!1l
,12'111452 1/

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1'112'<'1 . . 4

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II 111101.53
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8113
811"
8S15

II
II

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11 ".~".576 k

10111.53
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IIIIU'7 II "H!I",.,3

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1I!04'!5
IlI",4AI!

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li"11451

~4111.17

"2111417

PIClIIoT A L.INt.
TH~ LINE IIUFFEIC .ADDRESS IS
PIIINT 15 IN THE L.OCATION ~OLL.OWING THE JMS.

ICLI:'.AR ERROl< FLAG
IDETERMINE & SAVE CURRENT ADDRESS
ISET CURRENT AOOR~SS
IPRf.: VENT ,,0110 COU,.T OVf.:R~ LO ..
1t.XI:'.CUTt:. PHlNl 101, CLI:l\1o( f.:VI:NT YARIAIILt:.,
ItNAIiLE L.P lN1ERRUPT, AND WAlT FOR THE EY~NT
IVARU8L.E Ttl liE SET NUN-ZERIJ IIY THE INTt:.RHUf'T
ISERVICf.: ROUTINE.

L.AC
Aiii 0
SNIo
JMP
L.AC
SZIo
JMP
CAl.
J"S
eL.A llAC
OAC

Ev
IlNTERRUPT liAS OCl:URRtD -- ~XAMINI: PRINTER STATuS.
(200000)
IALAR" I:'.Rk OR L.P OF~ LINf.:?

CAL
JI'IS
L.AC
JMP

MTCPS
"FAt!
CAliF
PRNTl

PRNTXT
PRIIITEf
PHNT2
TEMCPII
wFAIi

11010 -- tXlT PH NT SUt!ROUTlNt:.
IIliEIOI tRROH't
INO -- UEL.AY liND kETRY
IYES -- TYP~ ERR MESSA(;~

PRNTEF
JUELIoY
ItjETKY

I
PHNUT

PRNT
ItXl T PRNT SUIIROUT l"E
ISZ
PRNT
JMP*
I
PRNT Ef
I
I
I W~AII
SUllliOUTlNI:. TO WAIT fOH t:.VI:.NT VAkIAIILI: TO til: StT ANO THEN TO
I CHECI< THE lktGGt:.R EVENT VARIABL.E TO S~E H AN AIIOHT Rf;~UI:ST SHOUl.l)
I lit:. PROCESS~D.

XI-4-24

PAGE
5107
908
919
9U
1111
1112
5113
9141
1115
1115
1117
1118

111

LP.~2

,.,e

0
CAL.
LAC
R TL.
SMA
JI'IP"

WI'ECPS
TG

IIIAlTl'OR ~v TO tiE SH.
115 BIT 2 O~ THt. TIHGGtR SET?

WI'AtI

INO

RETUkN

Ot-IiIUEUE THE A80RT REQUEST.
14"'~150

1111/141'1.

1I00li151
(11151/1523
12111526

DZI'I
LAC
DAC"
JMS"

TG
PDVNA
(Rl)
(OQRQ)

1110415'5
01111'151\
1'104157
"'111'7111
1/I1/I'7!
11111147,

f'!2U!!3
"4111!!57
(116111624
, 1'1 III li6 1
tl'6IH!23
.211163'

JI'IP.
OAt
OAC.
LAC
OAC*
JrlS.

WI'AH
liN
(R2)
POI/NA
(Rl)
(OMTQ)

lII'U7~

II/IU7~

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SEVR"I

1'1047' R 112l'14!53 H

JMP*

wfAB

011/1.61
IIIIU152

920
921
922
923
924
92!!
921'1
927
928
929
11:50
931
1132
1133

II ••
U5
1iI'6
9'7
11'8
11'9
llli0
II!! 1
11152
iii 15:5
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9!5li
91515
iii 157
Sl!5S

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1 1/1
1II1II'~t'!1 p
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1111'1415111 P 112(11 4!! 3
11I1'I4!!'
1'II'1'!!'5

I'IUI5~

937
1138
1139
1iI'0
1iI'1
11'2

1'IIlJ'!!~

IIU

IiIU
iii 3 15
iii 3 15

RSX L.1Nt PRINTER MANDLER

!lRC

II
II

IPHYSICAL. DE V ICE ,"ODE AON
I(Al, R2, R., Afl, XI( & AC ANt ALTERED).
IIIAS A REQUI:ST fOUND?
INO .- SHOULO Nt.Vt.A RETUAN HERE.
IYES -- SAV!: NOuE ADR
IPHYSICAL Dl'lICE NODE AOIi
IOETACH L.UN & DEVICE, IF NECESSARY, AND THEN
IlHPTY THt. REQUEST QUEUt. OF ALL 110 REQUESTS
I"'AOE By TH~ TASK 81:ING AtlOkTED. (Rl, R2; R3,
IR!!, R6, XU, X11, H2, XI< & AC ARt. AL TERt.O).
ISET REQUI:STER' S l'IORD'S') tv, DECRtII'IENT THE I/O PENUING COU"'T, AND liETURN NOIlt. TO PUOL.

.t.NOC

I
I St.VRN -- SUIIROUTINE TO SET nlE RELiUt.STOH'S "VENT VARIABLE TO
THE QUAlliTITy IN AC, OECL.AkE II 5IGNlI'ICA,.T EVENT, UECREMENT 110
I TIUNSFENS PtNUING COUNT (NORMAL I100t) , AND RETURN HEQUEST NODE
I TO THE PCOL.
I

1II1""7!! ,. "'''''''000 A
00nl! ,. 12'00O
1110'7' II ,O1111557
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~'l'I!5!'i2
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1110!!1113 ,.
2"'0 A
11105111' ,. 110111511
:UP!li52
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721000
11105"'15
73!l10P116
1'10507
11111151'"
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5t:.VI<N

RN
UOJ

ISAVE Ev VALUE
IREQUEST NOllE AOR

P.\X

14,

OI!'1!!1! " ,0(11!!!!?
"S1iI624
1It!!!!I'
.20!66li
1II1'I!51:!1

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L.AC
TAD

/
NOSET

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NOSET
XAllJ

INONE SPECH ItO

III, X

ISET EV

LAC
DAC ..
JI1S*

HN
[R2)
[lOtD)

IllECLARE 1/0 REQUEST COI1PLETEO (DECREMENT
/TRANSFERS PEIllDINII COUNT).
I [R!!, )tR, & ~C ARt. ALTEHt.U)

XI-4-25

P.G~

2111

RSX LINt PRINTUI 11."'OLER

!IRe:

LP.32

g!j9
115e

"'111"1141 r: ""1'1666
IIIIII''It!! r: 705:1U

LAC
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(401000) IDEeLARI: •

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g63
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95:1
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01'1!!17 II' "'6"'623

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(POOL)
(Rl)

00!!2111

J"'h

(N.DO)

JMP*

SEVRN

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971
972
1173
97.
9711
976
977
97e
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982
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111111'521

II'

'2"'67d R

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II:.XJT

'SEVI/", '

SUBHOUTHIE

I
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EXIT REIoIUEliT

(FHO'" T"511

• ••• RE.")

I
I!!lIJ!!2'

",!rII.HI?

1110!!2~

",6"'623
UPl!5!!7 R
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12"'li70

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111111'1211

o AEll

LAC
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L"C
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JI'IS*

(POOL)
(Rl)
RN

IRE TURN Rt-QUEST NUDE TU PUOL.

(H2)

("1.00)

PDP11> TURN off 1.1"11: PR INTER
.IFU".O lIC15
LPDl
CAL
DCPt!
.ENI)\;

701'i5fH
"'0"':172

fJ0!!27
1lI111"!:!!1II

I'DP-ll

IUIUIlLI: L.P INTERwUflll!
IOISSCCCO"'N!:CT

TUH", OFF LtNE PRINTER

.IFO!:F UC15
JI'IS

lSZ
CAL

CLE.R
CCP8
CCPII

ICLEAR OUT OEv ICE 1 N P IRI: X
''''AIIE CONNECT. DlSCONN!:CY
ONU OISCDN"'ECT

POilU

ICUAR ASSIGN INHI8IT FLAG IN PDVL !IIODE

.t-NOI.

ISZ

00!5:!!1 r: 4'!I'!j5i2 R
IIIfJ"I3' II' 7'!5!52i2
1""!!3 11 D 16P1!j62
III 0 !!:!! 41 D 705:121
III PI "!:!!!! r: "''''Cllfi2:>

.INI1

Dl"'*

POVU

.EN8
CAL

(Ul)

II:.XlT

101111
1002
1003
10114
10I'l!5
10fJfi
1007
1008
100i
lue

RI:.QuEST "'UOI:. TO POOL

I (R2 IS AL.RI:ADY StTUP)

lie.

IIS!5
geb
9S7
lise
gell
IIl1e
11111
1192
1103
gil.
glle
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II lie
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IR~ TUHII/

SIGNIFICANT I:.VENT

00"1311
1110537
"l0!'1<1'"

"0"'1111710
711'771'i2
",,1lI!j!53

I INTERRUPT SERV ICE ROUTI"'E
I
IlNTERRUPT til/TRY POINT
INT
0
DIlA
OAe

AC8!'

IENTER INUEX
ISAvE .t

lPAGt)

MOOf.

POP-15 LINE PHINTEH INTEk~UPT SECTION

1110!!',

711'''15152 A

.IFU"'O UC15
LPHS

IHEAD ST AlUS AND SET IN EVENT VARUtlLE

XI-4-26

PAGE
1811
1812

11113
1810\

121

RS~ LINt. PRINnR HA",DLER

LP.32

"RC

lllfOS"'?
1111115"'3
I1HIlS . .

""""'55!! R
711HI641 A
'1IJ151521

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DAC
LPCS
I.PCO

EV
ICLt.AII STATUS, ERR FL.AG, & DOIl4E !'LAG

.ENDt

11115

11116
11117
1018

POP-11 LIII4E PRINTER INTERRUPT SECTION
.IFDt." Ut15

111111
182e

1821
1822
111123
112",
1825
18211
1827
111128
111128
1III3f1l
18111
111132
111133
11113.111135
111136
1137
1138
1038
1111"0
1111"1
1IIJ42
1111"3
1fIl4 ..
10"5
111146

I .. '

CAP I
LAC
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JHP
aAC
OAC

105e
1851
U5e
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lIiI55
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1057
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1058
10611
11181
1882

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TG
LPOON

ItLI:AII OU1 t I._G st. T BY PINt.X
110IANTED 011 NOT
15K IP IF YES
11'101 ",A"'Tt.O, JUST GtT OUT

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1IIt!l5"'!l
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(4I1JlQllIIlIJ)/OEtL.ARE A 51GNIFICANT EVENT

IU
INT11
I
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CABf
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ACBF

I/)

IXR ADJUST CONSTANT TO SUISTII_CT PAGt. IIITS
lAC BUFFER
I INITI AI. tUWRENT ADDRESS t$UfFER
IEVENT VAHIABL.E
IMODE INDICATOR
I ADDRESS OF REQUEST NODI:. P ItKt.U fROM QUEUt.
/TRIGGEII EVt.NT VAllIABL.E

IIJ
III
IIJ
IIJ
III
0

IRESTORE At
IRETUIIN TO l"1TEkRUPTEU PRCGIUM

INT

I
"'01i1I1JIII~

A
",1110000 A

paV,..A
POYTA

IPHYSICAL Dt. V ICE NODE AOOIIESS
IADDRESS OF ,lOR Of TRIGGER t.v IN PHY DEV NOOE

I
1'J1IJ58:.'1

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11"8

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1110!!158
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1110'57"
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II
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II

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215
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ICONIoIECT CPt!

16
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I.EAVE 50MI: OUT FOR UClb TO SAVt-. SPACt;

DCPII

12
IIJ
111

IDISCONNECT CPB

XI-4-27

PAGE

10e3

"'111!!7!!

RU LINt PRINTf.R HANDLER

~Rr::

LP.32
~

"'11Il"5~&

INT

R
I

Uu
U15e
10156
10157
lee15
1015.
107iJ
1071
1072
1873
187.
1075
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1877
1078
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1880

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1!111I!!7f! ~ "'111111"'13 A
IIIA!!77 D "'01115!!5 R
11111111111111
"'0"'012 A
1111;1 II iii 1
11111"'0(111 A

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p r>01115!!:1
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1

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2

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I

1111;11111

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0111111f11 P 11;.7&150
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1081
1082
1083
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PAGE

.END

~0111000

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START

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'lax LINt PRINT!:." HANDLER

LP.32

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00155P1
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'1011101113 A *L
774011111 A *L

oL.
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NO EHROR LINES
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0085~

XI-4-28

PAGE

2.-

A80liT
"CSF
AI.AD
ATTAC"
ATTDET
CU
CA8F
CCPIl
DAElt
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DL.AO
DMTQ
DQRQ
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ERR30
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01110325
III I!! 2:501
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11105:54
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01110337
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111"555

LP.32

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111"264
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11105315
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III I!! 547
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141

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71115541
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XI-4-29

PAGE

PQ
PIIINT
PRNT
PIINTEf'
PIINUT
PRNTI
PRNT2
PTL.

1l1li1211
1111112515
1110417
1II1l4:52
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111

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112
113
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701

XI-4-30

CHAPTER 5
CONSTRUCTION OF FRONT-END INTERRUPT DRIVER TASKS

The Front-End Interrupt Driver Task has both computational and
interrupt-processing capabilities. Unlike the Computational Task, the
Front-End Task has an internal interrupt routine. The Front-End Task
does not however, utilize the QUEUE I/O Directive to control this
routine as do I/O Handler Tasks.
The following pages present a sample Front-End Interrupt Driver Task
named VPVEC, which is used for generating straight-line vectors on the
VP storage scope. A full assembly listing is included on subsequent
pages.
VPVEC is a subroutine with four entry points for performing
the following operations:
• Connecting to and disconnecting from the interrupt line
• Erasing the display
• Plotting a straight-line vector
The following description summarizes the flow of control through this
subroutine.
Line numbers in the leftmost column below refer to
decimal line numbers included at the left margin of the assembly
listing.
Line Number

Label

Description

25-43

CINT

Connect
display
interrupt
routine,
VPVEC, to interrupt line 14. Note that,
if the Event Variable (EV) is negative,
the connection could not be made and the
subroutine will delay for ten clock
ticks
and
then
try again.
If a
successful connection is made, EV is
cleared before returning to the caller.

44-54

DINT

Disconnect display interrupt routine,
VPVEC,
from interrupt line 14. The
testing of the EV is not required here,
so
the
address of EV in the CAL
Parameter Block, line number 52, is
zero.

55-61

ERASE

Erase the face of the storage scope.
This
operation
(EST)
generates an
interrupt once the display has been
erased
and
requires
waiting until
completion. This is done by issuing a
XI-5-1

Line Number

Label

Description
WAITFOR EV from routine WFINT (line
180). The interrupt routine,
VPVEC,
clears the display flag when the erase
operation has completed, sets the EV,
and declares a Significant Event (API
level 6). This results in a scan of the
Active Task List and a return following
the WAITFOR (contingent upon priority).

62-178

VECTOR

This is the straight-line vector plot
routine
which calculates the points
required to generate the line,
and
displays them one point at a time.
Following each
point
displayed,
a
WAITFOR
is
done
to wait for the
completion of the displayed point (lines
149 and 176).

179-186

WFINT

Subroutine to issue
a
WAITFOR
EV
Directive
until the point or erase
operation has completed. It then clears
the EV before returning.
(If the EV
were not cleared, the next WAITFOR EV
issued would return immediately since
the EV is set.)

187-197

VPVEC

Display interrupt service routine which
sets the EV signifying the operation is
complete and declares a
Significant
Event (API level 6). The display flag is
cleared and control returned to the
interrupted Task.

XI-S-2

PAG~

VP,t!

SRC
I

EDIT #t!
EHASE

I
I
I

!:I

1
4:?
.5
6
Ii

16
17
18
19

:58

SUBROUTINE TO ERAS!::

~)(8:171/lI/l!:l~~
~Y8=7fdI/l611l4
ESTa7fc?fd/~4

SODF=7~fc?'~1

CDDF"=lfdlO7,2

L.Xt3D=7~"'~4
L.VBD=71/l1c?~~4

I
,~L.OBI..

CINT,DINT.EHASE,VECTOR,.DA

I
I
I

000kH!J
00001
000",
000".5
00004
001110;
000fc?6
000k:l7
0012l1~

H 000f/l00
to(
000011
R ,O0236
H 14121236
R 740100
to( 620000
R k:l000",5
H r,H/l12l2~6
H 600''01

O0011
00012
00013
00014

H ~00k:l11
H 00121236
R "00k:l14
~ 0002U

A
R
R

elNT .- CONNECT INTERRUPT L.INE

CINT
CI NT1

A
R
R
R
R

I/l

CAL.
I.AC
utM
SMA
JMPo

~AL.

MARl<

CAL.
J"1P

WF'CPB
CINTl

IC
EV

CINT

4O
41
42
43
44
4,
46
47
46
49

CA~LABLE

Hl0!:104 A
700604 A
7~0124 A
700'21 A
700722 A
700'64 A
7OO664 A

.- FORTRAN

V~lNT

0001' H r.p00k:l13 A
00016 H 0012l2.56 R
00017 R k:l00 " 112' A
0012l2~ R "12l0001 A

I
MARl<

J.J

l-.V
1~

1
I
I

DINT ...

DIS~ONNECT

01Zl04:?1 R 000k:l00 A
0002~ H 000024 R
000C!~

~20021

DINT

III

CAL.
JMPo

OINT

51
52

00024 H "00"'12 A
210025 ~ 0rbnl2l0 A

0002~

R ~00014 A

,KREJCI

TO CONSTRUCT A VECTOR FROM P1(IX1,lY1) TO p~

14:?
1.S

3k:l
31
32
3.5
34
3,
36

VE~TOR

1k'
11

1-1

ICALLING SEQU~NCESI
CAL.L ~lNT
(CONNECT INTERRUPTJ
I
CA~L UINT
CDI~CONNECT INTERRUPTJ
I
CAL.L ~RASE
I
CAL.L VECTOH (IX1.IY1,lX2,IY2)

2fc?
21
22
23
24
2,
26
27
28

SCOP~,

11 OCT 71

kl
l.~

XI-5-3

I NTERHUPT Ll NE

PAGE
54
5)
56
57
56
59
6ID
61
62
63
64
6,

66
67
68

69
71/1
71
7'Z

73
74
7;

76
77
78
79
811)
81
82
83
84
8,
86

87
88
89
911)
91
92
9J
94
9,
96
97
91:1
99
10'"

101
UC!
U.s
104
11115
11116

VP,6

SRC

1/l0027 R 0011l2U R

V~lNT

I
I

1/l00Jk1 H 01/1001211/l A
"003i Fe 700724 A
1210032 R 100202 R
1/l01/l~J ~ 621/l0~0 R

I
ERASE

lJ~lNT

ERASE

VECTOH •• CUNSTRUCT L.INE

VECTOR

ra
JMS·
JMP

I/J

III

X2
V2

IZJ

.DA

IrE. TCIoI ARGUMENT AODRESSES

•• 5

rc?

01/l04J H 221/l0J7 R
1/l1/l1/l44 R 740031 A
001/l4S H 361/l0 41 R
1/l0046 R 722001/l A
1/l01/l47 H 741101/l A
1/l01/l51O ~ 740031 A
1/l01/l,i H 040222 R
01/l0,C! R 731/l001/l A
U0,J H 75111210 A
1/l1/l1/l,4 R 777776 A
1/l01/l~S 10( 740031/l A
1/l1/l0'~ R k140224 R
iZl00,7 ~ c!20rc?41/l R
1/l006rc; R 740031 A
0121061 R JU042 R
1210062 H 722000 A
I(H1l063 H 741101/l A
121011164 H 741/l031 A
1/l006~ H 040223 R
1/l1/l066 H 730"'01/l A
1210067 to! 7'11~HJ A
131/l0710 R 777776 A
130071 H 74210JI/l A
01,"He! R ~4121225 R

I/J

[5T
JMS
JMP*
I
I
I

1/l1/l1/l34 R 0001/100 A
001/lJ5 H 120240 E
IUI/l36 H U01/143 R
00111057 R rc? 00 1Il0l/l A
1/l1/l0411l to( 01/l1/l0 0I/l A
1/l1/l041 H iH'l1/l01/l0 A
1/l1/l0.2 ~ 000 I/II/l I/l A

ERASE •• ERASE STORAGE SCOPE

L.AC*
TCA
TAO*
PAL.
SPA

ID~TERMINE

DEL.TA-X & X.INCR POL.A

T~A

OAe
OEL.X
PI.A
SPAtel.A
I.Aw
-2

lAC

!JAC

XINC

L.AC*
TCA
TAD·
PAL.
SPA
TCA
UAC
PL.A

IOETERMINE DEL,TA-Y & Y.INCR POL-A

DEL.Y

~PAtCL.A

I.Aw
lAC
UAC

... 2

I.AC
TL:A

OEL.V

TAD

OEI..X

YINC

130217,s to! 2"'0223 R
002174 H 740ra..sl A
00075 H .540222 R
1210076 to! 741101/l A
002177 M 60111121 R
121010'" M 200,22 R
0121Ul H 040232 R

SPA
JMP
I

I,.AC
OAC

lIS

DE~TA.X

GREATER

T~AN

EQUA~

IYES _. INITIA~l~E rOR ~ORlt I.A~GE
INO ..... I~ITIAl..l~E rOR VERT ~ARGE

OEL.x

INC=OEI.X

XI-S-4

PAGE
107
Uti
109
11"
111

112

1105
114

11'

116
117"
111:1

119

121d
121

VP,I:I

SRC

H 2rl111J223 R
011Jlldo5 H 1Il40235 R
011JU~ ~ c201d37 R
0rl11kl~ H 0411J230 R

011JUI~

1Il0106 H -2211J040 R
1Il0107 H "40226 R
11J011~

H ~00241 R

00111 ~ 040177 R
00112 H 2rl10242 R
001105 H 040173 R
011J11~ H c011J224 R
00ll!) ~ ~402;$1 R
00116 H 211J11J225 R
1Il0117 H 0411J227 R
11ll1J12id H 600141 R

12~

123
124
12;
126
127
121:1
129
130
131
132
133
134
13>
136
137
13t1
139
14k?
141
142
143
144
14'
146
147
148
149
151d
151
152
153
1541
15~

156
157
151:1
159

L.AC
OAC
L.AC*
UAC
L.AC*
OAC
L.AC
OAC
'-AC
DAC
I..AC
UAC
L.AC
UAC

0012:. H 200223 R
011J12c H 1d40232 R
1Il012J H 2rl10222 R
0012~ ~ 0411J2J5 R
1Il012~ H 220040 R
11l012~ H 1d411J231Z1 R
0ru27 H 220037 R
0013k! ~ 0411J226 R
00131 H 2iZ10243 R
001J2 H 0411J177 R
00UJ H 200244 R
0013~ H 040173 R
1Il01J!> H 200225 R
001J~

JMP

I..AC
UAC
L.AC
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L.AC*
UAC
L.AC*
OAC
L.AC

R ~40231 R

001~~

ISCCaY
IL.CMaLXBD
ISCMIIloYB
IL.CI=XINC
ISCI-YINe

DlL.v
NO
DEL.X
NR
Y1

INC~DEL.Y

INlohDEI.X
II.CcaV

\.AC
OAe

NC
NT

DAe

L.AC*
L.X8
\.AC*
LoYBD
JMS

I..AC

INC a 0 ?

VECTOR

1VE.::i .... EXIT

HeR

R ~40234 R

IL.CCIIX

'-AC
OAC
I..AC
UAC
L.AC
OAC
I

00141 f( 200232 R
00142 H 0411J233 R
00143 H 744020 A

INHaDEl.Y

Xl
LCC
Yl
scc
(loXBD)
I..CM
CL. YB)
SCM
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I.Cl
VINC
SCI

l.CC
Xl
scc
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L.CM
(I. XB)
SCM
YINC
I.CI
XINC
SCI

u~c

00137 H 200224 R
001~fd H 040227 R

DEI..Y

ISCCaX
ILCMIII.YBD
ISCMaLXa
IloCI IIV I NC

Isex-xINC
INT-NC
INA=NC/2

01ca4, H i20037 R
0014~ R 700!>04 A
00147 H 2221040 R
2IflIl'''' H 7021664 A
0fl11'l. 10( 100202 R
001,2 R 200232 R
001'3 ~, 742,200 A
0"1~4

10(

I
PLl

SNA
..IMP.

620"34 R

01111;5 R 723177 A
001'~ ~ ~40232 R

IPLoOT INITIAl. POINT

loin NT

HC
OAC

.. 1

INO •• NCINC .. 1

01111>7

200234 R
001~0 H 340235 R

L.AC
TAD

NA
NR

001~1

H il40234 R

OAC

XI-5-5

INA-NA·NR

PAGE
16117

161

162
163
164

16!:>

166
167
168
169
170
171
172
173
174
17~

176
117
178
179
18111
181
182
U.s
184
18:;
186
187
188
189
190
191
192
19.5
194
19!)
196
197
198
199
200
201
202
2121J
204
20!)
2216
21217
208
209
21"
211
212

VP,8

SRC

12101~c R ,rD1II233
l2lru~~ R 7401i'JJ1
12I11l1~~ H ;s402J4
121016> R 7~Uell2l

R
A
R
A
121016~ R 600174 R
1210167 ~ 04111234 R

I2IU7~ H ~IU1226
121111171 R "4111227

R
R
0"172 H 04111226 R

0017~

H 7~1'/lIi'J4121 A

001704 R 22111123121 R
I2If1117S ~ J~1Il231 R
121017~ R 04023121 R
00177 R 7,UIi'J4121 A
12102117117 H 10021212 R
00201 H ~~U52 R
00202 H 0111011700 A
121021iJJ R liH'02216 R
0111204 H 14111236 R
12111120~

SCM
I
PL2
L.CM
I

I
wF'INT

121111210 R 000flllll0 A
00211 H 70'1762 A
11111121~ R [11421237 R
1II1!I21J R 440236 R
00214 H ~0e1245 R
e1021S H 705,04 A
1;"'216 H 71110722 A
1210217 R 2riJ0237 R
1210220 H 71ZJ3344 A
1210221 R ~2021121 R

WF'CP8

INA>NT

NA
PI.2
NA
scc
SCI
scc

INO -- DO I.AR~E COUNT MOVE~ENT
IYES -- NA.NA-NT & COMBINED MOVE
ISMALL COUNT MOVEMENT
ICL.YB OR I.X8)

Lce
I.el
I.CC

JMP

PLl

ILARGE COUNT MOVEMENT
leL.XBD OR I.YBD)

wF'lNT

ITO EXIT TEST

0
OI!M
JMP*

I.AC
TAO
OAC
XX
JMS

CAL,

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XI-5-6

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XI- 5-7

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21h

CHAPTER 6
USE AND ALLOCATION OF I/O BUFFERS

This chapter presents a description of the allocation of I/O buffers
within a Task's partition for use by I/O Handler Tasks. It also
describes how Tasks such as the Assembler make use of available free
core and how buffer preallocation is performed.

6.1

I/O BUFFERS

Some I/O Device Handlers or I/O Driver Tasks require intermediate
buffering of data.
For example, disk file Handlers read and write
blocks of 256 words to and from the disk, but user Tasks typically
read and write much smaller records. Thus records are packed and
unpacked in intermediate I/O buffers rather than being transmitted
directly to and from the disk. This has the effect of reducing the
number of disk transfers. It is often necessary because some disks
can only be addressed in complete blocks.
It would be possible to provide I/O buffers internally within I/O
Device Handlers, but this would limit I/O handling capabilities, and
it is desirable to have an unlimited number of open files in the disk
file Handler.
Thus buffers must be provided externally, and are
created, when needed, within the partition of the Task issuing the I/O
call.

6.2

PREALLOCATION OF I/O BUFFERS

A partition is constructed in such a way that the Task resides in the
bottom of the partition and I/O buffers are created at the top. A
certain amount of free core (see Figure 6-1) usually separates the
two. Tasks such as the Assembler are written to take advantage of any
available free core (for building dynamic tables), but a Task cannot
have information on how much free core exists at the time it is
loaded.

XI-6-l

When a Task is made active, free core is determined by the size of the
partition
(P.SZ)
minus the Task size (P.TS). The symbols in
parentheses are the names of these parameters that appear in the
Partition Block Description List (PBDL) node. Initially, the Task
size is the amount of core occupied by both resident code and
overlays.
For a USER-mode Task, the size is always adjusted to a multiple of
256, which is the unit of core allocation when memory protection and
relocation are used.
I/O buffers are created at the request of I/O Handlers, for example,
when the Task issues a SEEK directive to open a file. Creation of I/O
buffers necessarily diminishes the free core. The Assembler needs to
use free core before it has opened all its files: it thus uses the
mechanism described below to preallocate buffer space.
The Assembler issues a PREALlocate I/O directive to each LUN which it
may eventually use. If a LUN is connected to an I/O Handler that uses
external buffers, the Handler calls a reentrant routine in the
Executive to perform the Task. Preallocation of a buffer simply means
that space for a buffer is reserved but not created. Buffer space is
reserved by decreasing a parameter called the Virtual Partition Size
(P.VS). Initially, the Virtual Partition Size is the same as the
actual size of the partition (P.SZ), but it is reduced every time a
call is made to preallocate a buffer.
The Virtual Partition Size establishes a ceiling on the Task size
(which can be increased at run time). Free core is the difference
between P.VS and P.TS.
Since buffer preallocation is
not
a
requirement of all Tasks, P.VS also is reduced when a buffer is
created out of free core space.
Buffer preallocation by the Assembler sets aside enough space in the
top of its partition to satisfy the future requirements of the I/O
Handlers which it may use. Once this is done, the Assembler issues a
RAISEBound Directive to the Executive. This causes the Task sizes to
be increased to encompass free core (consistent, of course, with the
requirement that USER-mode Task sizes be a multiple of 256 words). The
address of the top of free core (the new highest Task address) is
returned to the Assembler so that it can tell how much it has
available.

6.3

BUFFER ALLOCATION AND DEALLOCATION

Buffer allocation and deal location are performed by reentrant routines
in the Executive. Within the PBDL (see Figure 6-1 below) is a buffer
pointer (P.BP) which is the head of a chain of buffers within the
partition.
Initially, P.BP contains a zero to indicate that no
buffers have yet been created.
Buffers are created starting at the top of a
partition
and
subsequently right below the lowest buffer in the chain. A buffer
consists of two header words, followed by the actual buffer space
usable by the I/O Handler. The first header word is a pointer to the
next buffer in the chain (zero if there are no more), and bit 0 is an
XI-6-2

availability indicator (of the current buffer, not the one pointed
to). Bit 0 contains zero if the buffer is not in use.
When a buffer is deallocated, its "in use" bit is set to zero, but the
buffer remains in the chain. In other words, "garbage collection" is
not performed. If a buffer in the chain is free and is exactly the
size required by the Handler, a new buffer is not created and the old
buffer is reused.
Buffer sizes may differ among the various Handlers.
Duffer-allocation routine uses the following rules:

6.4

correct

As a result,
size

exists,

the

If a free buffer of exactly the
buffer is used.

this

If an appropriate buffer is not found, but sufficient space
exists to create the buffer, this is preferable to using a
free buffer that is too large.

If an appropriate buffer is not found and sufficient space
does not exist to create one, an available buffer should be
selected which is large enough and most closely matches the
required size.

REENTRANT EXECUTIVE SUBROUTINES

The following three reentrant system subroutines have entry points
fixed in the System COMmunication (SCOM) area of the Executive:
PABF = 350
ALBF = 353
DABF = 356

/PREALLOCATE I/O BUFFER.
/ALLOCATE I/O BUFFER.
/DEALLOCATE I/O BUFFER.

Calling Sequences:
R2 -- I/O request node address
R4 -- I/O buffer size
JMS* (PABF)
Return here on error
Return here if successful
R2 -- I/O request node address
R4 -- I/O buffer size
JMS* (ALBF)
Return here on error
Retur~ here if successful
with the buffer address
in the AC
R4 -- I/O buffer address
JMS*
(DABF)
Unconditional return

/Registers R4,R5,XR,and
/AC are altered.

/Registers Rl,R3,R4,R5,
/R6,XlO,Xll,Xl2,
/XR, and AC are altered.

/Registers R4,R5,XR, and
/AC are altered.

Note that the I/O buffer address in this case is two more than the
address used internally within ALBF and DABF, since the caller need
not know about the buffer header used for chaining and size.
XI-6-3

TOP

P.BA
P.SZ
P.TS
P.VS

I/O BUFFER 1

P.BP
PARTITION
BLOCK
NODE

I/O BUFFER 2

I/O BUFFER 3

P.vS

P. S

TASK AREA

..
BOTTOM
Figure 6-1
I/O Buffers Within a Partition

XI-6-4

P.BA

INDEX

Advanced task construction, 1-1
Allocation of I/O buffers,
6-1, 6-2
Altmode, 2-1
Attach Flag Table (AFT), 4-1

Buffer allocation and deallocation, 6-2
Buffer preallocation, 6-1
Buffers, 4-2, 6-1
within a partition, 6-4

Carriage return, 2-1
Command input line, 2-1
Construction of advanced tasks,
1-1
Conventions,
I/O handler construction, 4-1
MCR task construction, 2-1
TDV task construction, 3-1
CTRL/C, 2-1
CTRL/T, 3-2

Deallocation of buffers, 6-2
DETACH directive, 4-2
Devices, 1-2, 4-3
Dots, 3-1, 4-1

Hardware interrupts, 4-2
Hardware registers, 1-2
Header word, 6-2

IFAC subroutine, 2-1
Internal interrupt routine, 5-1
Interrupts, 1-2
I/O buffers, 1-2, 4-2, 6-1, 6-4
I/O device handler task example,
4-4
I/O handler construction, 4-1
I/O rundown, 4-2

Listing output, 2-1
Logical unit number (LUN), 4-1
Logical unit Table (LUT), 4-1

MCR function task example, 2-2
MCR interaction, 2-1
MCR request inhibit (MCRRI) flag,
2-1
MCR task construction, 2-1

Name of MCR function task, 2-1
Naming conventions, 1-2
Nodes, 1-2

Event variables, 4-2
Exec mode, 3-1

Fetch-A-Character (FAC)
subroutine, 2-1
Files, 1-2
Free core, 6-2
Front End Interrupt Driver task
(VPVEC), 5-1

Partition Block Description List
(PBDL) node, 6-2
Partition size, 6-2
Physical Device List (PDVL), 4-2
Pool of Empty Nodes, 1-2
PREALlocate I/O directive, 6-2
Preallocation of I/O buffers, 6-1

QUEUE I/O directive, 4-1
Garbage collection, 6-3
Guidelines for advanced task
construction, 1-2

XVM/RSX VIB

RAISEBound directive, 6-2
REASpIGN, MCR Function task, 4-2

XI-Index-l

September 1976

INDEX (CONT.)

Reentrant system subroutines, 6-3
Registers, 1-2
RSX devices, 4-3

Use and allocation of I/O buffers,
6-1
User mode, 3-1

Subroutines, 6-3
System resources, 1-2, 4-2
System subroutines, 6-3

Virtual partition size, 6-2

Task exit, 1-2
Task priority, 4-2
Task size, 6-2
TDV function task example, 3-3
TDV task construction, 3-1
Trigger event variable, 4-2

XVM/RSX V1B

XI-Index-2

September 1976