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DIGITAL-8-19-U

December 1965

12 pages

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Document:	digital-8-19-u-d
Order Number:	DIGITAL-8-19-U
Revision:
Pages:	12
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/digital-8-19-u/digital-8-19-u-d.pdf

OCR Text

IDENTIFICATION
I.I

Teletype Output Subroutines

1.2

Digital-B- I 9-U-Sym

1.3

April 7, I965

PDP

8
LIBRARY

Digital—8—I9—U-Sym
Page 2
2

ABS TRACT

A group of subroutines useful in controlling ASR—33 output is presented as a

package.

Provision is made for the simulation of tabulation stops.

The distance "tabbed"

may be controlled by the user. Characters whose ASR-33 codes are in the groups 24I through
277, inclusive, and 300 through 337, inclusive, are legal. Space, carriage return then line

feed, and tabulation are provided via subroutines.
3.

REQUIREMENTS

3 I

Storage

This collection of subroutines occupies 74 (decimal)
3.3

core

locations.

Equipment
Basi

9D P-8

USAGE

4.]

Loading
This package may be placed in memory by the use of the Binary Loader.

See

Digital-8-2-Rim for a complete discussion of this loader.
4.2

Calling Sequence
AII subroutines are called with a JMS instruction and return to the next location

in core.

Enter the character typeout subroutines with a single character in AC bits 6 through

pair of characters in AC bits 0 through 5 and 6 through II, respectively. (The charbits 0 through 5 will be typed first in the latter case.) Enter the digit typeout sub—
routine with the digit to be typed in AC bits 8, 9, IO, and II. Other subroutines are merely
II

or a

acter in

caHed.
5.

RESTRICTIONS

(Not Applicable)
6.

DESCRIPTION

6 I

Discussion

This package uses short subroutines to type the formating characters,
return

followed by line feed, space, and tabulate.

carriage

Digital-8-l9-U-Sym
Page 3
Other characters are represented internally by 6-bit codes so that two characters
may be packed to a word.
to

A short subroutine is used to convert the "trimmed" 6-bit code

the 8—bit code required for the ASR-33.

Digits are represented internally by a 4-bit code which must be in the AC
(bits 8, 9, 10, and ll) on entry to the type digit subroutine. If a code greater than mm
is present in AC bits 8, 9, 10, and ll on entry, the subroutine merely returns to the calling
sequence of instructions with no typeout.

OTY,

is used,

Every time the minor subroutine which actually types a character or digit, tagged
When the tabulate subroutine is called, the contents
a counter is incremented.

of this counter are used to determine the remaining space to the next tab stop.

Use of the

tabulate or carriage return followed by line feed subroutines sets the contents of this counter
to

METHODS

Straightforward
8.

FORMAT
For these subroutines external

(ASCII) and internal core formats may best be

illustrated by the following tables.
Characters Developed From Stored Code
00

300

301

241

302

242

303

243

304

244

305

245

305

245

307

247

310

250

1 1

31 1

251

(
)

312

252

313

253

314

254

315

255

315

255

317

257

320

250

321

251

Digital-8-19-U-Sym
Page 4
22

322

262

323

263

3
4

324

264

325

265

326

266

327

267

330

270

331

272

332

272

333

[

273

;

334

274

335

275

336

276

337

277

Characters Provided By Subroutines

carriage return then line feed
space

tabulation
All other ASCil characters are illegal in the sense that they can never be

developed by these subroutines.
9.

EXECUTION TIME

These subroutines are output limited.
10.

PROGRAM

10.4

Program Listing
A listing of these subroutines with TYPE located in 0200 is as follows:

0200

0000

/PDP-8 TELETYPE OUTPUT PACKAGE
0
TYPE,
/TYPE ONE CHARACTER
AND TTAB+1
/0077

0201

0301

0202

4260

JMS CON

0203
0204

4266

JMS QTY

5600

JMP I TYPE

0205
0206

0000

3276

DCA TEMY

0207

1276

TAD TEMY

0210

7012

RTR

0211

7012

RTR

TY2,

/TYPE Two CHARACTERS

Digital-8—19—U—Sym
Page 5
0212

7012

RTR

0213

4200

JMS TYPE

0214

1276

TAD TEMY

0215

4200

JMS TYPE

0216

5605

JMP I TY2

0217

0000

0220

7200

(ILA

TYCR,

0221

1302

TAD TTAB+2

0222

4266

JAAS<DTV’

0223

1303

TAD TTAB+3

0224

4266

JAAS<DT\’

0225

3277

DCA TBC

0226

5617

0227

0000

0230

/TYPE C.R. AND L.F.

/0215

/0212

JMP l TYCR
TYS P,

/TYPE A SPACE

(ILA

7200

0231

1304

TAD TTAB+4

0232

4266

JAAS<DTV’

0233

5627

JAAPI TYSP

0234

0000

0235

7200

(ILA

0236

1277

TAD TBC

TYTB,

0237

1300

'DAD TTAB

0240

7500

SANA

0241

5237

JMP .-2

0242

3277

DCA TBC

0243

4227

JMS TYSP

0244

0245

5243
0000

0246

0305

AND TTAB+5

0247

3276

DCA TEMY

0250

1276

TAD TEMY

0251

1306

0252

7700

TAD TTAB+6
SNMA<ZLA

0253

5645

0254

1276

/0240
/TYPE A TAB
/—10 OR USER SET

JAAP u-1

TDIG,

0255

1307

JAAPI TDICB
TAD TEMY
TAD TTAB+7

0256

4266

JAAS CYPY

0257

5645

JAAPI TDICS

0260

0000

0261

7510

SBA

0262

7510

TAD TTAB+TO

0263

1311

0264

1304

TAD TTAB+H
TAD TTAB+4

CON,

/TYPE A DIGIT
/0017

/—12

/b260
/TR|MMED TO ASR 33

/ —4O
/moo

/b24o

Digital-8-19-U-Sym
Page 6
0265

5660

JAAPI<CCDF1

0266

0000

0267

6046

TLS

0270

6041

TSF

0271

0272

5270
7200

(ILA

0273

2277

ISZ TBC

0274

5666

JAAPI CITY

0275

5634

JAAPI'TYTB

0276

0000

0277

0000

0300

7770

0301

0077

OTY,

JAAP u-1

TEAAYQ
TBC,
TTAB,

7770

0302

0215

215

0212

212

0304

0240

240

0305

0017

0306
0307

7766

0260

260

0310

7740

0311

0100

0100
0260

CDTV’

0266

TBC

0277

TDIGE

0245

TEANY

0276

TLAB

0300

TVTZR

0217

'PYPE

0200

'TYSP

0227

'TYTB

0234

'PY2

0205

/VAR|ABLES

0303

C(DFJ

/ONE CH. OUT AND COUNT

11.

DIAGRAMS

(Not Applicable)

12.

REFERENCES

(Not Applicable)

13.

ADDENDA (Not Applicable)

14.

ERRATA (Not Applicable)

/CONSTANTS