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DIGITAL-7-11-IO

April 1964

7 pages

Original

0.4MB

Document:	TICTOC
Order Number:	DIGITAL-7-11-IO
Revision:
Pages:	7
Original Filename:	http://bitsavers.org/pdf/dec/pdp7/DIGITAL-7-11-IO_TICTOC_Apr64.pdf

OCR Text

Tlctoc

DATE!
SPECS'

ABSTRACT:

Teletypet in;~l!t","·tJ;"ntput cO~:~1/.~loi1 package tor tbl!

PDP-4.
j.'t;

Con'n~r-"G lnput t,C) 'cH)no1ae code and packs

ttl1"'ee tt) (j. "'tJ.:Oro~

Conv'tr-ts pack~d concise eooe

taxt to teJ.~'tY'.pf; an" ';;,yp~~~ 1. t

Ot.\t 4'1

Rout1n~s may

D1g1 tal-J+,..34-u

P~e

DESCRIPTION:
is a eomplet;$ 1"..0 conversion package. No
external routines ~'e rsquired. There are four
main subroutines 1il ~rx~roc which perform the fol'rICfl'QC

lowing serV1C!6st

tic

converts a string 0,(, typed-in charaoters ~o concise oode an.d packs them
thl"ee to a word :In the part of memory
dl'i:signated by ttte user.

onet1c

will eonvert one typed character to
concise coda and present i.t to the
user 11 s program.~

METHOD:

toe

will type cut So string of text packed
in the 8 &me format used
by tic ~
,

cotoc

Will convert and type out one chal~ac
tar presented t,o 1~ in concise code.

TICTOG userJ a ta.bl~= lO('1kup for conv61 s1ol"'i 111 both
1O

directions
~~ and .!l~ft shifts are kept
track of internally and ,do not; generate codes for
th~ us~n:l(t
'wh~)n text is typed in or out, case
shifting is done :tnternally !3.:'1d on input 1s automatically provided ~'here n~ceb Jary
Tabula.tions
are also perfo:rrned ccrr.reG t~ly "
0

'i'

RESTRICTIONS~,

The FIO-DEC and t.peletype character sats atte far
from compatible ~Iherl special characters are required. HO'WE':'Is'r, ,all. thi'jsecharacters neede'(j for
the Assembler or tor F<:>rtran have been provided
flqu~.valf~nts on t;he Telety'pe [l,et.'f as shown in the
l;8.o1e

nig1tal-4-~U

P.... 3

FIO~DEC
=

!!tetD!

letters

numbers
•

(

)

..
(underbar)
V
1\

(overbar)

x (multiply)
t

USAGE:

1. Input

onette

(minus)

D181 tal-4-Z~4-U
.
pag:f; 1.4,

When a }cey has tHit8n struck..

on~t1c will convert
the oharacter to concise ocd.~ex1t with thla

code in the AC. It the resulting character is
upper case in the FlO-DEC aat, ~hen AC o will be
set to 1.

By tta naturel onet1c does not 1n~. t1al1ze
the shirt tlaga If.nUl Rlt~·T8 recommended that one

use the subroutine reset before usins ,2!let1c tor
the first time. ThlS'-lo- easy enough, mere'!y 8~
reset
•
•

onet1c
and the Job '.r111 'be don~.

Re8~t

returns the car-

and sets all flags and

riage, gives a line ree<l~

the tab count. toO zero.
One-tie keeps track or the tabulator count,
and 1rtnetab key 16 stl'!uc}k.1' the program will
space out to the l1ext,; tab stop.
To lnpu,t e.. string of oharacters and pack
them into meluory§ the subroutine tic is required"

The calling sequence is
la~1

._r~

stop ohar

tic
aae butter

where ~t9~ char .1s the c~nc1Be code 01.· a term1-

nat1ngf!mtr1."tUI.. When ~,fh1s c.haracter 1s typed"
tic packs 1 t S,\1a.y with the rea t of the text ancl

stops l:tstening. a'urfer is tlS addrStss of the
first l()catton of "r'tr.nrl!k of ~)t·;~rl:lge into wh:1.ch
the 1rlcoming t~ext is '·1;0 be pa(;',ked
Chlu"ac ters are packed. "three to a \A/ol'ld.. 1:he
first, f;ecclnd arid thi!'d charar.;tars :In order of"
arr1 val are packed tnto the le~rt I m!tddle s.:nd 1che
4

right sections' of the word, respect1velyo

When

the terminat.1.ng charanter 18 e'ncoux1tered,l 'C is
packed a.way and t:he \\i'oro 18 filled out wl.th the
specl,g.l cod~13" If} t;he last; word 1s comr;lete
in ltaelf 1 an extra. ~lor'd conta.inlng 1)oth1n.g but
:L3 • s 1 a a~dded to the text
The norrnal return fr(")m J,~!ft" 1.s to the ins truct10n following the II dac tlufl~Y, wi tl1 the quanto

tity "dac buffer+n+1 n in the AC where n is the
number of ~~ used in packing the text into
storage.

Two k~y~ h~}IIt'l ept1C i~,l meaning f~t)r tic ~
~.~

!",lne f eed te&"U{il$!::\ t-.:te t() tgnerrlt ':!ffbJ~,:,t ha$ been t,yped M(i ~tart
ov'ell a.garn~ LF tlf:!'~ct1vely ~raaes the ~lnrOl~Attt;)l~i
1n thetru.ffar d! i\ e~"'7'1~~ge return 1!J pl"ov1d&J by
4

the a\~brout1nts"

Onetlc ol:.!cup1oEl eljOS" It)catJons

~'t.

1IMIII~lW'lHIt

With ,~J..£# the pr(~gram oc~uples 3178 locat1onB.

To ~ype out a s-iflgle t~hf.lt~a.ct~~r.l' the 0al11ng St~quen
ce

~,.s

ls:v: char
(;otoc

wh,ere char is 'the c()n(~!se. \~cd,e of' th~ character
t;) be 'tyPia, It; 1,:3 a good idea here also to call
reset before the first qae of cotoc, since the
~r prc~gram makes no as~:,tul'lt~;roil""i about the ~ltate
of 'the k&ybo?:trd or thf;: ce.JjS of the incoming lett;ers
The case shift codes are treated by setting
th~ casefla.g in c()toe a;:;cc)rd1rtgly..
No character
i:J typed. out ~ /'1. ''t~~j3T!'(':;'ount :ts kept, and th~:: code
,..l.
r""'o''''~

4·
~',;h
tIt.".,,;,.;

(3.;:")\
.?.} ",·.li1"1
\Ill \~....
.. ""~ ...... th<f·
tf~1..

.;:1,U,1o.)l,;;

•

,\;~

telep~"!J.",,:,l.J...,,~
,.,,\.it,-ar ,to
v
I

ppel'~,~

~'Q'-_ ,_

to the next t~h stop~

A carrit=ige rE;ttrrn t~tll caUFH'~ both en B.nd LF to be

typed ..

stop eode

D1g1 tal-4-3 At-U
1)8.81& 6

Tt.'t type out a string of' text' psu3ked aocordingly to
the format deacr1bedfor tic, the calling sequence

-,-

law butter -1
toe
~~er.

"butrerff is the address of the first word of
t~18 block ot storage containing the texto
The last
c~aracter 1n the string must be a Itop code.

to~~.

Here again r8S6t 11 not needed separately as

does its owrl""Tiin1a11z1ngo Using eotoc
as a 8ub•• -.,..1
rou~1ne, toe w111 print the content8 of the butfer
unt~.l it encounters the stop code, at whi.ch point it
will.. return to the main program with 13 in the AC.

It either toe or catoe encounters a code f9r

wh11'Jh no tsletytS'requ1'VKllht haa been assigned (see

table), a If?" w111 be typed in its place.

The output subroutine oacup1fls 3128 locat1onsft

3. Useful subroutines.
TICTOC oontains some small subroutines which m~
be or use. The name of the subroutine and 1ts'call
ure 1dentioal.
ca..rr

This types a CR ~"1d a LF and sets the tab

typit

This wtll type out the character glven by

cO'W1l;er to zero '"

the code in the lo~r"... order f1 va bits of the

AC.
tab1t

This spaces the ca.j~riage to the nex.t tab

stop",

Use 01' this subroutIne requires

the u.ser to keep a c.ount of spaces in the
storage 1(;lcat1on II t.{\bc U
Thls count is
kept aut,omat1cal1y :tll TICil"tQC ~
It

D1g1 toll,~'34-U

'age 1:"

ASSP.MBLY PROOElOOltII
TIC~roc <H'n818t~
&88.,,1'018d in a~1Y
.

ot three AS 'tap~')8.
order.

They &!lay be

SU'brout ines ~c. n contains ttl. tl1.1brout1nes, constants and 'V'4r1able!l 8aaential 1.~O a.ll of tne TICTOO programJ. It muat be Inclu1ied when using 'J..nY
one of thei'.!.
ft

"t.nput" ~~onta1n. the two lubr<)1.1tinel,. onet1c a?~
Whel'l UI1fJg tne ;rOl1'tffl!';-on.lY

tic!i in ,hat orcler.

tne f1r1Jt part of' the tape nl(td ~. &SI!Jf!\bledc Th.e
two prv,jgrams are separated by a start J to ansemble tic treat the two Paltta or the ta.pe &J two
I

8epar~~te programs

til