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XX-2BDBA-12

December 1965

18 pages

Original

1.8MB

Document:	maindec-826b-d
Order Number:	XX-2BDBA-12
Revision:
Pages:	18
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-826b/maindec-826b-d.pdf

OCR Text

iDENTIFICATION
1.
.2

PDP-8 Maindec 826-8
680 5‘8” Character Exerciser

November 17, 1965

PDP

8
LIBRARY

PDP-8 Maindec 826—8

Page I
2

ABSTRACT

The 680 5-Bit Character Exerciser program further verifies correct operation of the 680 Data
This test assumes that the Teletype lines are full duplex. However, it the line
Communications System
outputs are iumpered to the line inputs, the test verifies that the input characters are received as trans—
.

mitted.
3.

REQUIREMENTS

3.I

Storage

3.I .I

Exerciser Program

2‘

Address 0
Concurrent Output Test

02008 to 03778
04008 to 05358
06008 to 06I68
I0008 to I0748
2200
to
23778
2400
to
25778

Output Data Table
Concurrent Input Test

Output Switch Register Routine
Output Butter
Input Buffer

000I

Interrupt Routine
3.I .2

Character Assembly Subroutines (List of Items)

0004

TT5BGN

Start of Subroutines

T5IN

TTI

T5IBF

Area

Input

T5OBF
,

‘

Output Buffer
Second

T5OBF2

Buffer

Output Butter

’

TT5PGO

Page 0 Constants

TTCHAR

Character Register

T5AXI

Autoindex

T5AX2

Autoindex

I I

T5AX3

Autoindex

T5AX4

Au toindex

‘

3.2

’

Subprograms and/or Subroutines
Digital-8-35-S-A
680 5-bit Character Assembly Subroutines

3.3

52008 to 55778
56008 to 64008
72008 to 75778
66008 to 67778
70008 to 7I778
0I458 to 0I768
0I778

Equipment
Minimum

Configuration PDP—8

680 DCS hardware (Including a 50 or 75 Baud

Clock)

PDP-8 Maindec 826- B

Page 2
3.4

Miscellaneous

The 50 or 75 Baud Clock in clock I.
4.

USAGE

4.I

4.I .I

It the

Binary loader beginning at address 7777 is in memory, go to Section 4.l .2.
Binary Loader must be loaded into memory.

Other-

wise the RIM Loader and/or the

4.l .2

The 680 5—Bit Character Exerciser may now be loaded into memory as follows:
Set

77778 in the SWITCH REGISTER

Press LOAD ADDRESS

Place the Character Exerciser in the keyboard reader
Press START

Engage the keyboard reader
4.3

Switch Settings (See Section 4.4)

4.4

Start up and/or Entry

4.4.I

Concurrent Output Test
Set the SWITCH REGISTER to 0200

Press the LOAD ADDRESS key
Set the SWITCH REGISTER equal to the lowest line number tobe tested.
Press START; the processor halts at address 0202.

Set the SWITCH

Press CONTINUE; the program outputs a fixed message on all
‘

4.4.2

Concurrent Input Test
Set the SWITCH REGISTER to 0600.
Press the LOAD ADDRESS key.
Press START; the program scans I28 lines for inputand retransmits characters on the same

line as the one in which they are received.

Output SWITCH REGISTER test
Set the SWITCH REGISTER to I000.
Press the LOAD ADDRESS key.
Set the SWITCH REGISTER to the line number to be tested.

Press START; the processor halts at address I002.

PDP-8 Maindec 826-8

Page 3
Set SWITCH REGISTER bits 7 through II
as

equal to the character to be transmitted, and SWO

follows:
SWO-down:

SWO-up:

Do not test for input

Wait for input and verify that it is the same character as is transmitted.

(See the

end of Section 4.4.I )
Press CONTINUE;
’

the program transmits a carriage return—line feed, the contents of AC

switches 64 times, and then repeats.
Note that since the input is two characters behind the output,

the Character Assembly Subroutines) SWO may not be changed from 0 to a I
It may,

however,

4.5

be changed from a I

Errors in

(due to double buffering of
once

the program is running.

0 and switches 7 through II may be altered at any time.

Usage

Hardware malfunctions detected by the program result in a processor halt.
a

The following is

list of these error halts and their meanings:

4.5 .I

Address 0002 Not Clock

Interrupt

Either an interrupt was received from a device other than Teletype clock I,
did not skip after an interrupt from clock I

the IOT 642I

4.5 .2

Address 0307 Data Error

The processor halts with a line number displayed in the AC indicating that a data error has
occurred on the line. Press CONTINUE; the processor halts at address 03I2 with the character that
should have been received in the AC.

Press CONTINUE again, and the processor halts at address 03I5

with the character that was received in the AC.

4.5 .3

Address I055 Data Error (Output AC Switches Routine)
Processor halts with the character transmitted in the AC.

This could be a carriage return,
in
the
the
a line feed, or
code contained
SWITCH REGISTER. Press CONTINUE, and the processor halts
at address I06I with the character that was received displayed in the AC.

4.5.4

Detection of an

Open Input Line

If the data error halt at address 03I2 is consistently executed with a specific line number
input line is in a constant "SPACE" or open

and the character received is always 0, it indicates that the

line state.

4.5.5

Detection of a Constant "MARK”

The 680 Character Exerciser was written with the assumption that the Teletype lines being
Also, the program assumes that any input received during the concurrent output
the line outputs are tied to the line inputs. Therefore, if there is no input on
to
that
due
the
test is
fact
a line or
any of the lines the program does not consider it an error. Assuming the test is operating with
inputs tied to outputs, the only way to be sure that a line is transmitting and receiving is to open the input
tested are full duplex.

line in order to force a data error.
Note that this procedure is likely to show up any errors in translating line numbers,- i.e.,
The line then is closed again and an error is in-

input line I7 is opened and the processor does not halt.
dicated, for example, on line 37.

The malfunction is probably in the decoding of line I7.

PDP~8 Maindec 826~B

Page 4

Recovery From Such Errors

4.6

Pressing CONTINUE causes the program to proceed.
leave some at the output lines in a “SPACE“ condition.
these outputs will run free until the program continues.

transmitting and receiving,

It is possible that an error halt will

If this happens, any Teletypes that are tied to
Also, in the process of opening lines to test For

it is possible to get the input of a line out of sequence with the output.

this case, it is necessary to restart the test.
RESTRICTIONS

The Character Assembly Subroutines scan the lines in even multiples of eight lines. Thereerror could be indicated on a line. or lines that have not been selected to be
fore,
the
in
Switch
Register Routine, it line I‘is selected to be run, the inputs of lines 2,
run, e.g.,
Output
and
be
should
3, 4, 5, o, 7,
placed in the ”MARK" state.
‘

it is possible that an

IO8

DESCRIPTION

6.
.

5:!

Discussion

o.I .I

General
The 680 5-Bit Character Exerciser transmits and/or receives 5-bit coded Teletype data at

the line speed of Teletype clock I and will verify correct operation of the 680 DCS hardware.
gram allows parameters to exercise up to I28 lines and includes three test modes:

Concurrent

o.I .2

Input, and Output the Switch Register.
‘

Test Descriptions

Concurrent Output Test

6.I .2.I

program

The proConcurrent Output,

The Concurrent Output Test accepts parameters to transmit on from I through I28 lines.
that all the lines selected are full duplex and that any input is due to an output line

The

assumes

iumpered to an input line.
The following message is transmitted on all lines selected:
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
0123456789 -?':$'.&#'().,;/"
RYRYRY

It input is received on any at the lines selected, the program verifies that the characters
Also, since the input is tested almost in-

received are received in the same order they are transmitted.

dependently ot the output, it is possible to jumper input Iinesto output lines in any configuration that is
desired, including and/or other than I for I
.

o.I .2.2

‘

Concurrent Input Test

The Concurrent Input Test initializes to scan all I28 lines for input.

When a character is

received on a line, the program transmits the character received on the same line.
i

6.I .2.3

Output The Switch Register Routine

This Routine transmits the code contained in SWITCH REGISTER bits 7. through II on the line
contents of the SWITCH REGISTER when the routine is started
the
The program transmits a
specitied by
.

carriage return, line feed, the contents of the SWITCH REGISTER 64 times, and then repeats. It SWITCH
REGISTER bit 0 is a I, the program transmits a character, waits for it to be input and then verifies that the
output and input are equal. Since the input is two characters behind the output (due to the double but—
tering of output characters in the character assembly subroutines), the compare mode must be selected at
the time the processor halts at address IOOZ.

PDP—8 Maindec 826—8

Page 5
METHODS (Not Applicable)
FORMAT (Not Applicable)
EXECUTION TIME (NOT Applicable)
TO.

PROGRAM

1094

Program Listing
PAUSF
/TYPF

68w

TELETYPE

LINE

MULTIPLEXER

BIT

/EXERCISFR
/KFN
12/15/66
/STABT

BOO

LINE

STARTING
/COMPUTEP NILL
/NITR

/SFT SNITCRES
/CONTINUE
/PROCRAN NILL
/IS

NUMBER

LINES

UNTIL AN ERROR
UNTIL STOP_

RUN
OR

DETECTED

SWITCHES

NUMBER

HALT

ROUTINE

/1NTFRRUPT
Rflflfil

flflfl1

6421

INRUPT,
HLT

5 BIT CLOCK
INTERRUPT
/YES, PROCESS INTERRUPT

/NAS

T5SKP

W022

7402

Mmm3

54®4

JMP

“2&4

522G

TSOIS

UNKNONN

/NO.
,+1

/TT5BCN

%2Mfl

W208

76Q4

OCSTST,

®2m1

323%

OCA

M2W2
W203

74fl2
76®4

OLA

OSR

/CET

STARTING

STRLIN

/SAVE

CLA

OSR

/HALT, WAIT NUMBER
/CET NO OF LINES
/SAVE IT

HLT

@2m4

3331

OCA

NUNLIN

@205

1331

TAO

NUNLIN

W2fl6

7241

CIA

W2fl7

3332

OCA

LINOEX

[SAVE

@212

1332

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LINOEX

/SET

/FOR

INITIAL.

/SET

M211

3345

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0212

1333

TAO

@213

123%

TAO

OUTOEX
STRLIN

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@215

1335

TAO

W216

123m

TAO

INPOEX
STRLIN

@217

3912
1337

OCA

OCRELP,

@221
W222

3411

OCA

1337

TAO

@223

3412

OCA

CHARAC
I z 12

M22@

/NO

/2'S

LINE

IT
OF

LINES

LINES
COMPLEMENT
FOR

COUNTING

/INOICES
OF

/INPUT ANO
BUFFERS

/OUTPUT
a

TAO
11

W224

7345

ISZ

NOEX

M225

522%

JMP

OCBELP

@226

1331

@227

4552

@232

flflflm

TAO NUMLIN
TSINIT
O
STRLIN.

CHARAC
/AOORESS 0F CHAR
/TO OUTPUT BUFFER
/AOORESS TO COMPARE
/CHAR TO INPUT BUFFER
/COT

ALL

TABLE

LINES

/NO

/SET

NO OF LINES
IN AC
/INITIALIzE TTY
/STARTINC LINE

NUMBER

PDP-8 Mai ndec 826- B
Page 6
@231

6424

TTSON

/TURN

CLOCK

@232
@233

6@@1

ION

/TURN

INTERRUPTS

72@@

CLA

@234

123@

TAD

@235

1334

TAD

@236

334@

DCA

@237

123@

TAO

STRLIN
OUTDEX+1
CUROUT
STRLIN

@24@
@241

3341

1332

DCA
TAO

CURLIN
LINOFX

@242

3345

DCA

NOEX

@243

174@

OTLOOP,

@244

3342

OCA

SAVCUR

@245

1742

TAO

SAVCUR

@246

3177

OCA

TTCHAR

@247

1341

@25@

455@

TAO CURLIN
TBSOF

ON‘
ON

/FORM START OF
/OUTPUT RUFFER

FIRST

/CET

TAD

CUROUT

LINE

/CET

NO.

POINTER

FOR

OUTPUT
'

/CET

OUTPUT

CHARACTER

/CET LINE NUMBER
/CHECK FOR FREE OUTPUT
/OUTPUT NOT FREE
/AOO 1 TO CHARACTER POINTER

@251

741@

@252

274@

SKP
182

CUROUT

@253

174@

TAO

CUROUT

@254
@255

7@41

CIA

1343

TAO

@256

744@

SZA

@257

5262

JMP

.+3

@26@

1337

TAO

CHARAC

@261
@262

3740

DCA

234@

ISZ

@263

2341

182

CUROUT
CURLIN

@264

72@@

@265

2345

CLA
ISZ

NDEX

@266
@267

5243
4551

JMP
INLOOP.

@276

5233

JMP

STRLIN+3

@271
@272

3341

OCA

CURLIN

1341

TAD

CURLIN

@273

1336

TAD

@274

334@

DCA

INPDFX+1
CUROUT
I CUROUT

/CET

INPUT POINTER
THE LINE
INPUT POINTER

/CET

,/37

OTLOOP
TSSIR

174@

TAO

3342

OCA

@277

TAO

@3@@

1177
@344

SAVCUR
TTCHAR

@3@1

7@41

AND

LSTCHR+1

CIA
TAO
SNA

INCINP

1742
745@

@3@4

5317

JMP

@3@5
@3@6

72@@

CLA

1341

TAO

@3@7

74@2

HLT

@31@
@311

72@@

CLA

1742

TAO

@312

74@2

HLT

@313

72@@

CLA

@314

1177

TAD

@315
@316

@344

AND

74@2

HLT

@317

274@

@32@

72@@

INCINP,
CLA

@321

174@

TAO

/ADVANCE TO NEXT LINE
/AOVANCE TO NEXT LINE
/CLEAR FOR TAD
/TESTED ALL LINED FOR
/NO, TRY NEXT LINE
/ANY INPUT AVAILABLE
/NO, OUTPUT AGAIN
/YES. SAVE LINE N0.
'

@276

@3012

/THE END OF OUTPUT
/NO
/YES RESET POINTER
/T0 FIRST CHARACTER

CUROUT

@275

@3@3

/HAS CURRENT
/LINE REACHEO

LSTCHR

/FINO
/FOR

SAVCUR

INPUT

/CHARACTER INPUT
/EOUAL CHARACTER

CURLIN

CHARACTER

/YES.

INCREMENT

EXPECTED
POINTER

/LINE

NUMBER

/HALT
I

SAVCUR

/CHARACTER

EXPECTED

/HALT
z TTCHAR
LSTCHR+1

/CHARACTER

RECEIVED

/HALT

ISZ

CUROUT

/ADVANCE

INPUT

POINTER

CUROUT

/CET

INCREMENTED

POINTER

FREE

PDP-8 Maindec 826- B

Page 7
@322

7@41

@323

1343

CIA

TAO

@324

744@

SZA

@325
@326

5267

JMP

1337

TAD

/LINE AT END OF
/INPUT CHARACTERS
/NO, TEST FOR MORE INPUT
/RESET INPUT POINTER
/TO FIRST CHARACTER
/TEST FOR MORE INPUT

LSTCHR

@327

374@

DCA

INLOOP
CHARAC
I CUROUT

@33@

5267

JMP

INLOOP

@331

@@@@
@@@@

NUMLIN.
LINDEX.

@332

@333

2177

OUTDEX.

BUFFR-l

@334

22@@

@335

2377

INBUFR-l

/NUMBER

@336

24@@

@337

@4@@

CHARAC.

CODES

/START

@34@

@@@@

CUROUT.
CURLIN.
SAVCUR.
LSTCHR.

@
@

/TEMP
/TEMP
/TEMP

NDCOD+1

/FOR

@341

@@@@
@@@@

@343
@344

@527
@037

@345

@@@@

/FOR

NDEX.

BUFFR=22@@
INBUFR=24@@
/5 BIT CODES

ANDING
/FOR

OUTPUT

LINES

COMPLEMENT NO OF LINES
/FOR FILLING OUTPUT BUFFER
CHECKING OUTPUT BUFFER
/FOR FILLING INPUT BUFFER

BUFFR
INPDEX.
INBUFR

@342

/2'S

OF 5 BIT CODES
STORAGE BUFFER POINTER
STORAGE CURRENT LINE NO.

STORAGE CHARACTER POINTER
DETECTING END OF CHARACTERS
TTCHAR
COUTING

DCSTST

#400
@4@@

@@1@

CODES,

@4@1
@4@2

@@@2

/LINE

@@@2

/LINE

@4@3

@@37

37
22

@4@4

@@2@

@4@5

@@24

@4@6

@@@1

/CARRIAGE
FEED

FEED
/LETTERS
/T
/H
/E

@4@7

@@@4

/SPACE

@410

@@27

@411

@@@7

@412

@@@6

@413

@016

@414

@@17

@415

@@@4

/I
/C
/K
/SPACE

@416

@@31

@417

@@12

/B
/R

@420

@@3@

@471
@422

@@23

@@14

@423

@fi@4

/SPACE

@474

@@15

@425

@@3@

@426

@@35

/O
/X

@427

@@@4

/SPACE

@433

@013

@431

@@@7

@432
@433

@@34

@@26

@434

@@@5

@435

@@@4

/SPACE

@436

@@3@

RETURN

PDP—8 Mai ndec 8265- B

Page 8
0437

0036

0440

0001

14E

M441

0012

01
12

0442

0004

/SPACE
’/T

0443

0020

0444

0024

0445

0001

/H.
/E:

0446

0004

M447

0022

0450
0451

0003
0021

«72

0025

‘04

/SPACF

0454

0004."
0011

0455

0030

M456

‘32
02

/D
/o
/G
/CARRIAGE RETURN
A/LINE FEED

/FIGuRES

0452

0453

/SPACE
:/L

M457

0032
0010

M460

0002

M461

*0033.

13}

M462
0463

0026

0027

M464

0023

0465

0001

/2
/3
/4

10
i

0466

0012

01
12

M467

0020

/5
/6

0470

0025

0471

0007

/7.

0472

0006

0473

0030

/97

0474

0004

/SPACE

0475

0003

M476

0500
0501

0031
0016
0011
0015

/MINUS
/QUESTION
/COLON
/DOLLAR
/EXCLAMATION

0502
M503

0032
0024

0504

0013

0505

0506

0017
0022

M507

0034

34
14

/CDMMA
/SEMI COLON
/SLASH

0477

16
11
15

/AND
/NUMBER SIGN
/APOSTHROPHE
/LEFT PARENS
/RIGHT PARENS
/PERIOD
4

24
17

0510

0014

0511

0036

0512

0035

0513

0021

/0UOTES

0514

0010

/CARRIAGE

0515

0002

0516

‘0037

/LINE FEED
/LETTERS

M517
0520

0012
0025

12
25

05?1

0012

0522

0025

0523

0012

0574

0025

0012

0526

0025

NDCOD,

RETURN

0525

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PDP-8 Nkfindec 826—8

Page II
TT5ON:64?4

/TURN
/TURN
/SKIP

TT5OFF=6422

T5SKP=6471
TTINCR=6401
/6RO

LINF

/LIST

CLOCK ON
CLOCK OFF
ON CLOCK FLAG

/INCREMENT

LINE

MULTIPLEXER
ITEMS
T5IBF=72OO
T5OBF2=7OOO
T5OBF=660O
T5IN=56OO
TT5PCO=145
T5AX1=1O
T5AX2=11
T5AX3=12
T5AX4=13
TT5RGN=59OO

TTCHAR=177
*TT5PGO
M145

OOOO

T5INFL.

M146

7177

M147

MOOO

M150

54OO

M161

5423

M182

5447

T5RFK,
T5NL.
TSSOUT.
T5SIN,
T580,

M163

66mg

TSOUTK,

T5GOS
TSOBF

M154

7774

T5ONT1,

-4

M155

OOGO

M156

MOOO

T5OBF2

/INPUT READY FLAG
/TO RESET INPUT BUFFER POINTER
/-NUMRER OF LINES
/SKIP IF OUTPUT FREE
/SKIP IF INPUT READY
/INITIALIZE ROUTINE
/POINTER TO 18T OUTPUT BUFFER
/HOLOS MAJOR LOOP COUNTER
/MINOR LOOP COUNTER
/COUNTER FOR INPUT BUFFER
/FOR ANOING
/2NO OUTPUT BUFFER

T5CNT5.

/OUTPUT

T5CNT6.

-O

T5IBF—1
O

T5OUTS
T5INS

M157

M177

O16O
M161

7000

T5CNT2.
T5CNT3.
T5K10,
T5K36,

MOOO

M162

VMOOO

M163

777G

T5K2,

M164

56OO

T5K3.

M165

7776

T5K5,

M166

O4OW

T5K6.

4Mfl

M167

66OO

T5K7,

T5ORF

M17M

5291
QOOO

T5K8,
TSKQ,

T5COM

M171

M172

6577

T5K9A,

T5ORF-1

M173

5237

T5KQP,

T5CM1A

M174

5361

T5K9C,

M175

5221

M176

7000

177

-1@

T5IN
-2

COUNTFR

COUNTER
/TO RESET RIT COUNTER
/RESET INPUT TTI POINTER
/FOR SUBTRACTION
/TO RESET 5 BIT ASSEMBLY WORD
/K FOR lST OUTPUT BUFFER
/TO ENTER COMMON ROUTINE
/LINE NUMBER -1
/FOR CLEARING
RIT

AVOID OUTPUTTING
SET OUTPUT BUFFER
/FOR NORMAL RFTURN

JMP

/TO
/TO

T5K9O,

T5CM1O
T5COM

T5K9F,

NOP

/TO

INPUT

FROM

DOUBLE

ONLY

*TTSDGN

LEVEL
INTERRUPT ROUTINE
/ALLOWS MULTIPLE LFVFL INTERRUPT TO
/AND UNLIMITED
/MULTIPLF

IS?

52mg

P366

52Q1

5216

T5OIS,
JMP

52M2

3367

OCA

5293

701O

RAR

5204

337M

OCA

T5SVLK

5205

iflflO

TAO

ROUTINE

/LEVEL

T5LC
/2ND

T5OISE

/SAVF

T5SA

/GET
O

THIS

LEVEL

ACCUMULATOR

LINK
/SAVE

/INTERRUPT

COUNTER

INTERRUPT

LINK
ADDRESS»

BUFFER

PDP~8 Mai ndec 826- B

Page.12
‘6226

3371

5227

6414

TTRL

5212

3372

OCA

5211

6424

TT5O N

5212
5213

1171

TAD

6413

TTSL +1

5564

5216

6424

5217

6001

ION

522D

54MB

JMP

5221

1373

5272

3155

JMP

1375

T5K9

T5 K3

5227

5351

JMP

6232

6405

TTO+1

7155
5225

JMP

5235

6414

TTRL

5236

3375

DOA

5237

1374

3155

5241

2D1O

5242

141C

5243

7112

5244

743C

5245

5326

5246

72MB

T5CM1A."

7OBD

T5COM3,

525m

2D1O
2376

182

5252

2155

5253
5254

5241

2154

5255
5256

531%
1164

5257

3010

TAO

.1171

TAD

700l

IAC

5262

3376

5263
5264

1377
3154

2161

5266

5316

5267

1165

527M
5271

3161

5272

3375

1171

TSOUTK

/REAO
T5MNC2

/NO

T5CNT2

/MINOR

T5AX1

526B

‘

T5COM4.

5261

5265

/SAVE

ISE

T5COM2,
TAD
CLL

‘

/LINE
NUMBER
/OUTPUT

DONE

NUMBER
NUMBER
LINES/4

LINE
LINE

LOOP COUNTER
/AOVANCE FOR NEXT INPUT LINE
2 T5AX1
I
/CHARACTER ASSEMBLY WORD
RTR
/PUT BIT 12 IN LINK
SZL
/CHARACTER NOT COMPLETED
JMP T5COM6
/STORE CHARACTER
CLA
/CLEAR AC FOR TAD
/OR JMP T5CM1O
NOP
ISE 7 T5AX1
/UPDATE FOR NEXT INPUT LINE
/UPDATE LINE NUMBER
T5LN?
IS? T5CNT2
/ARE ONE-FOURTH OF LINES CHECKED?
JMP TSCOMZ
/CHECK NEXT LINE
ISZ T5CNT1
/HAVE ALL INPUT LINES BEEN CHECKED
JMP T5COM5
/RESET AND DISMISS
Z T5K3
/T51N
DCA Z T5AX1
/RESET TTI POINTER
7 T5K9
/START LINE—1
/SET TO FIRST LINE
DCA T5LN2
/RESET LINE NUMBER
/-4
TAD T5K2A
/INPUT CHECK COUNTER
OCA T5CNT1
IS? 2 T5CNT5
/HAVE ALL OUTPUT LINFS BEEN CHECKED
JMP T5COM5
/RESET AND DISMISS
TAD 3 T5K5
/-2
/RESET COUNTER
OCA 2 T5CNT5
TAD 2 T5K9
/START LINE~1
OCA T5LN
/RESET LINE NUMBER
RCA

5247
5251

TAD

LINES/8
LOOP COUNTER
NUMBER

T5LN

5233

/MINOR

T50UTK
2 T5CNT2
T5COMD

T5COM8

DCA

5234

T5COM1;

/-NO.

WORD
/CHARACTER AVAILABLE
/NOTHING TO TRANSMIT
/INCREMENT AND TRANSMIT
/RFSTORE CHARACTER
/UPDATE OUTPUT POINTER
/ARE ONE-EIGHTH OF LINES
/CHECK NEXT OUTPUT LINE

RNA

IS?
IS?

524a

CLOCK FLAG
/RF—ENABLE PROGRAM INTERRUPT
/RETURN TO THE MAIN PROGRAM

INPUT TTI LOOP
T5MNC
DCA 7 T5CNT2
TAD T5LN
/SET LINF
TTSL+1
TAD I Z T5OUTK
T5COMB,

1553

3553

/CLEAR

TAD

745%

2153

ADDRESS

/READ LINE NUMBER
/SAVE LINE NUMBER
/TO CLEAR CLOCK FLAG ONLY
/RE—ENABLE PROGRAM INTERRUPT
/STARTING LINE-1
/SFT LINE REGISTER. CLR AC
REGISTER, CLR AC

FROM

T5COM,

5226

5231

LINE

5225

5232

/SET

/2ND LEVEL INTERRUPT
TT5ON
T5OIS3.

/RFTURN

6413

ION

TSDISQ,

5214
5215

6273

TSSVLN
‘

6DO1

5224

/SAVE

T5SVO

DCA

PDP-8 Maindec 82648

Page 13
5273

2162

TSR

5274

5353

JMP

5275

1163

TAD

5276

3162

DCA

5277

2161
1172

TAD

53mg

Ts;

TSCNTD
T5COM9
T5K2
7 TSCNTD

/ENDING 7TH RIT?
/NO RESET NORNALLY
/41O
/RESET COUNTER
/ADD 1 TO COUNTER
/T5OBF~1
/OUTPUT POINTER
/TSOBF2
/2ND BUFFER POINTER
/SPECIAL ADDRESS. T5CM1A
/RESFT ADDRESS
/JMP T5CM1O
/SET TO DO OUTPUT
/TURN OFF INTERRUPT

(“"14 T5CNT5
TBKQA

53D1

3013

DCA

T5AX4

5302

116%

TAD

“H

T5K36

53D3
53D4

3153
1173

DCA

TAD

TSOUTK
z TSKQB

53D5

3170

T5K8

1174

DCA
TAD

53D6

T5K9C

5307

3247

DCA

TSCDMS

531D
5311

7240

STA

5312

1366

TAD

T5LC

/LEVEL

5313

3366

DCA

T5LC

/RESTORE

5314

1366

TSLC

6002

T5COM5.

10F

/~1

5315

77OO

TAD
EMA

5316

5212

JMP

T5DIS2

5317

1372

TAD

T5SVLN

532D

6413
1376

CLA

/LINF

71D4

CLL

T5SVLK
RAL

5373

1367

TAD

T5SA

5324

6OD1

ION

5325

5771

5326

7112

T5COM6;

5327

7012

RTR

533D

3411

LDCA

5331
5332

1376

TAD

3411

DCA

5333

10lO

TAD

5334

1165

TAD

5335

301O

DCA

5336

341%

DCA

5337

1166

TAD

534D

341D

DCA

5341

2145

IS?

5342

2156

5343

5247

IS?
JMP

5344

1146

5345

3011

DCA

5346

1147

TAD

T5NL

5347

3156

DCA

535D
5351

5247

5352

5232

JMR

T5COM79

TAD

JMP

T5COM8,

TAD

5353

1167

5354
5355

3153
1175

DCA

5356

317D

DCA

5357

1176

TAD

536M
5361

53D7
1553

TAD

JNP

T5CM1DA

RTR

“HHJ-fl‘HS‘H‘H—IH

T5AX2

/STDRE

5LN2
2 T5AX2

/LINE

T5K5
T5AX1

/w2
/RESET

COUNTER NORD
ASSEMBLY RORD
ASSFMBLY wORD
/SFT TNRUT READY FLAG
/RAS END OF BUFFER REEN REACHED?
/CONTINUE
/TSIRF41
/RFSET TNRUT BUFFER ADDRESS

POINTER
/2ERD STATUS_AND
/NORD TO RESTORE
/RESET CHARACTER

T5AX1
T5K6
Z T5AX1
T5INFL

T5CNT3
T5COM3
E T5RFK
7 T5AX2

/w«UMBER OE LINES
/RESET LENGTH COUNTER

T5CNT3
T5COM3

/CDNTTNUE

/INcREMENT

T5COM1
? T5K7

LINE

NUMBFR

/CONTINUE
/TSOBF

T5OUTK
T5K9D

/RESET OUTPUT POINTER
/NORMAL ADDRESS, TSCDM

T5K8

/RESET

T5K9E

/NOR

T5CON5R1

TAD

CHARACTER

NUMBER

/STORE LINE NUMBER
/TTI RDINTER

‘H‘VH‘HI‘N

T5AX1

TTINCR
JMP

T5COM9,

T5SVD

OLL

NUMBER
LINE REGISTER. CLR AC
/PICK UP LINK
/RESTORE LINK
/RESTORE AC
/RF°ENABLE PROGRAM INTERRUPT
/RFTURN TO THE MAIN PROGRAM
/REMOVE START CODE
/SET

5321
5322

64ml

LEVEL COUNTER
COUNTER
/RESTORE AC, ETC.
/CHECK INPUT AGAIN, ETC.
/LEVEL

=TTSL+1
TAD

COUNTER

T5AX4

T5OUTK

5362

3413

DCA

5363

3553

DCA

T5OUTK

/2ND

ADDRESS

/CDNT:NUE
BUFFER CHARACTER
/STORE IN 18T BUFFER
/CLEAR 2ND BUFFER

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PDP-8 Maindec 826- B

Page I5
S442

1412

S443

22?3

5444

6001

S445

5673

5446

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5452

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5467

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5466

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5467

1362
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1373

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T5K37

5471

3012

DCA

6472

TAD

5473

1147
3246

6474

1363

DCA

T5AX1

T5AX3
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TSCNT4
T5K22

6475

341%

DCA

T5AX1

S476

3410

DCA

T5AX1

DCA

MN TSAXZ

1166

55ml

3410
3411

TAD

TSKé

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3412
2246

65B4
65MB

5274
1364

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T5002

TAD

T5K24

BSDE

3410

DCA

65B7

1147

TAD

5519

7012

RTR

/—M/4

5511
5512

701m

RAR

/-N/8

@365

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/17

6513

1366

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T5K26

/776D.

5514

3767

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I‘T5K27
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I
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5515

1767

5516

1767

TAD

5517

3774

DCA

5570

724%

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T5AX1
TSNL

TABLE

OUTPUT

SSOZ

DCA
I
T50NT4

LINES

/TSOBF-1

BEDS

ISZ

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TSCNT3

TAD

LINES
LINES

‘

5463

T5009.

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5464

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TSNL

DCA

/377
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/37D
/TWO'S COMP. NUMBER
/-N, CONSTANT

1147
3156

BSBD

T500

B463

6477

LINES

N0.

6464

DCA

5460

S462

/EXIT
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TBINS

I71

5461

S461

N0.

I0 N

TSINONI

TBINIT=JMS
Dmflm

LINE
EXIT

/INDEX

/INITIALIZATION ROUTINE
/ENTFR WITH NUMBER OF LINES

5447

/PICK

TSINS

/CLEAB
/COUNTER

DOUBLE

BUFFER

NEXT LINE
I z TSKB
/STORE FINAL JUMP

/Do

/JMP

/-N

MAKE

NUMBER

NEGATIVE

PDP—8 Moindec 826—8
Page 16

55?6

1165

5527

5535

3161
1164

T5CNT4
Z TSBFK
T5AX2
/SET
TAO T5K28
OCA Z T5CNT1
TAD Z T5K5
OCA 2 T5CNT5
TAO Z T5K3

5531

3510

nCA

5532

1167

TAO

T5K7
Z

T5OUTK
T5GOS
T5K9

T5K9

5521
5522

DCA

3246‘
1146

5593

3511

55?4
5595

137G
3154

TAD

DCA

5553

3153

OCA

5534

724G

STA

5535

1647

TAD

5536

3171

OCA

I
3

5537

1171

TAO

5545

794g

CMA

5541

3217

5542

3145

OCA
OCA

5543
5544
5545

7245

STA

3771
2247

INPUT

T5AX1

T5SL
2

T5INFL

OCA

T5K35

IS?

T5608

/SET CNTR TO SKIP 18T TIME
/T5IBF*1
BUFFER POINTER
/-4
/MAJOR LOOP COUNTER
/-2
/OUTPUT COUNTER
/T5IN+1
/SET TTI POINTER
/T5OBF
/SET OUTPUT BUFFER POINTER
/—1
/STARTING LINE NUMBER
/STARTINC LINE NO-l
/STARTING LINE -1
/MAKE NEGATIVE
/—STARTING LINE NUMBER
/CLEAR INPUT FLAG COUNTER
/—1
.

/T5LC,
/INDEX

5546

1372

TAO

T5K35A

5547

3162

OCA

5555

1175

TAO

5551

317W

OCA

5552

1176

TAO

T5K9E

5553

3775

OCA

T5K4O

5554

5647

JMP

T5605

5555

T5K14,
T5K15;

377

5556

@377
WOO7

5557

@015

5568

337$

37“

/FOR

5561

5577

T5K16,
T5K17;
T5K20:

/FOR
/FOR
/FOR
/FOR

5562

5563

6577
6403

T5K21,
T5K22:

T5IN-1
T5OBF~1
TTI+1

5564

557g

T5K24:

JMP

5565

fl017

T5K25,

'5566

776®

T5K26:

5567

5373

-4

T5CNT6
T5K9O
T5K8

RESET

INTERRUPT

LEVEL

EXIT

/-7

r/SET SPECIAL
/T5COM
/TTI RETURN
/NOP
/T5COM3
/EXIT

5-BIT

COUNTER

/CONSTANTS
7

/FOR

EVEN MULTIPLE
EVEN MULTIPLE
EVEN MULTIPLE
STORING TTI'S
OUTPUT AREA

/FOR

FINAL

/FOR

-N/8

776$

/FOR

MAKING

T5MNC

/FOR

~N/8

MAJOR LOOP COUNTER

T5K8

5570

7774

T5K27;
T5K28,

5571

5366

T5K35,

T5LC

/FOR
/FOR

5572

7771

T5K35A,

-7

/FOR

T5OBF2—1
T5MNC2

5573

6777

T5K37,

5574
5575

5374

T5K38,
T5K40,

5247

ANDING

T5COM3

DIAGRAMS (Not Applicable)

12..

REFERENCES

12.1

Other Library Programs

Digital—8-35-S-A
680 5-Bit Characrer Assembly Subroutines

/FOR

/FOR
/FOR

JUMP

NEGATIVE

INTERRUPT

LEVEL
COUNTER
DOUBLE BUFFER
~N/4
SWITCH
5‘BIT

COUNTER