Digital PDFs

DIGITAL-8-5-U

December 1965

8 pages

Original

0.2MB

Document:	digital-8-5-u-d
Order Number:	DIGITAL-8-5-U
Revision:
Pages:	8
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/digital-8-5-u/digital-8-5-u-d.pdf

OCR Text

ID E NTI FlCATlO N

1.1

Dig ital-8-5-U-Sym

1.2

Binary Punch (ASR 33 or 75A)

1.3

March 1, 1965

Digital-8-5-U-Sym
Page 2

ABS TRAC T

This program provides a means of punching out information contained i n selected
blocks of core memory as binary-coded tape via the ASR-33 perforated tape punch or via the
high-speed punch 75A.

REQUIREMENTS

3.1

Storage

This program occupies 75 (decimal) core memory locations.
3.3

Equipment
Basic PDP-8 with standard ASR-33 or in addition the 75A high-speed punch.

USAGE

4.1

This program i s loaded by means of the Binary Loader. See DEC-08-LBAA-D for
a complete discussion of the Binary Loader and i t s use.
4.2

Cal Iing Sequence
None.

4.3

This program cannot be called as a subroutine.

Switch Settings

The switch register i s used to enter initial and final addresses of blocks to be
punched as well as the number of blocks to be punched.
4.4

Start Up/Entry

This program i s used i n the following manner.
4.4.1
Assuming the program i s i n memory as listed i n 10.4, place the starting address
7465 i n the switch register and press the LOAD ADDRESS key.
4.4.2
Press the START key. Leader w i l l be punched and the computer w i l l halt. Set
the number of blocks to be punched into the switch register and press CONTINUE.
The computer w i l l halt. Set the initial address of the block to be punched into
4.4.3
the switch register and press CONTINUE.
The computer w i l l halt. Set the final address of the block to be punched into the
4.4.4
switch register and press CONTINUE.
\

Digita I-8-5- U-S ym
Page 3
4.4.4.1

Note that the final address must be greater than the initial address.

The indicated block of data w i l l be punched. I f only one block has been called
4.4.5
for, the trailer w i l l punch and the computer w i l l halt. I f more than one block has been called
for, the computer w i l l halt a t step 4.4.3 waiting for a new initial address. The second block
w i l l punch following completion of steps 4.4.3 and 4.4.4, etc.
7.

METHOD

7.1

Disc uss ion

This i s a basic routine used to produce tapes acceptable by the Binary Loader
See DEC-08-LBAA-D.
Within each block, an initial address into which data i s to be loaded i s punched
as the first two characters. Following the initial address, each 2-character group represents the
binary contents of a computer word. A t the end of each block, a 2-character checksum i s
punched.

Reference to Section 11.1, Flow Chart, w i l l illustrate the computational approach.
Basically data i s picked up from memory, the most significant half shifted right and punched,
and the least significant half masked out and punched.
/A similar process i s followed with respect to the initial address and the checksum which i s accumulated character by character as a block i s punched.
8.

FORMAT

8.1

External Data
See DEC-08-LBAA-D for a complete discussion of tape format.

EXECUTION TIME
This routine i s output limited.

10.

PROGRAM

10.4

Program Listing

A listing of this program with BPUN located at 7465 i s as follows:

7465
7466

7300
6 026

/BIN PUNCH 75A
*7465
CLA CLL
BPUN,
P LS

/INITIAL PUNCH

Digital-8-5-U-Sym
Page 4

7467
7470
747 1
7472
7473
7474
7475

3366
4330
7402
7602
7041
3367
7402

7476
7477
7500

7604
3370
7402

LAS
DCA IA
H LT

7501
7502
7503
7504
7505
7506

7604
7001
337 1
1370
7120
4341

LAS
IAC
DCA FA
TAD IA
STL
JMS B l N P

7507
7510
751 1
7512
7513
7514
7515
7516
7517
7520
752 1
7522
7523
7524
7525
7526
7527
7530
753 1
7532

1370
7041
1371
7650
5320
1770
7100
2370
5306
2367
5275
1366
7100
4341
4330
7402
5265
0000
7300
1372

7533

3373

NXBL,

PUN L,

PLOT,

DCA CKSM
JMS PLOT
H LT
LAS
C IA
DCA NB
H LT

TAD IA
C IA
TAD FA
SNA CLA
JMP .+5
TAD I IA
c LL
ISZ IA
JMP PUNL
ISZ NB
JMP NXBL
TAD CKSM
c LL
JMS B l N P
JMS PLOT
H LT
JMP BPUN
0
CLA CLL
TAD M212
DCA CTRl

/CLEAR CHECK-SUM
/GO PUNCH LEADER CODES
/SET SWITCHES = NUMBER OF BLOCKS

/STORE MINUS NUMBER OF BLOCKS
/SET SWITCHES = INITAL ADDRESS OF
/B LOCK

/SET SWITCHES = FINAL ADDRESS OF
/BLOC K

/TO PUNCH IA AS ORIGIN
/GO PUNCH WORD AS TWO LINES OF
/TAPE

/AC = FA IA
/WAS I T LAST WORD OF BLOCK?
/IT WAS THE LAST WORD
/GET WORD TO PUNCH
/NOT A N ORIGIN
/JUST INDEX IA
/IS THERE ANOTHER BLOCK?
/HANDLE NEXT BLOCK

/GO PUNCH CHECK SUM
/GO PUNCH TRAILER CODES
/DONE

/TO PUNCH 212 OCTAL LEADER
/TRAILER CODES

Dig ita I-8-5-U-Sym

Page 5

7534
7535
7536
7537
7540
754 1
7542
7543
7544
7545
7546
7547
7550
755 1
7552
7553
7554
7555
7556
7557
7560
756 1
7562
7563
7564
7565
7566
7567
7570
757 1
7572
7573
7574
7575
7576
7577

1374
4361
2373
5335
5730
0000
3375
1375
7012
7012
7012
0376
4361
1366
3366
1375
0377
436 1
1366
3366
574 1
0000
602 1
5362
6026
576 1
0000
0000
0000
0000
7566
0000
0200
0000
0177
0077

BINP,

PUN,

CKSM,
NB,
IA,
FA/
M212,
CTRl ,
c200 /
TEMl
SVf
SL6,

TAD C200
JMS PUN
ISZ CTRl
JMP .-2
JMP I PLOT
0
DCA TEMl
TAD TEMl
RTR
RTR
RTR
AND SL7
JMS PUN
TAD CKSM
DCA CKSM
TAD TEMl
AND S L 6
JMS PUN
TAD CKSM
DCA CKSM
JMP I B I N P
0
PS F
JMP .-1
P LS
JMP I PUN
0
0
0
0
-21 2
0
200
0
177
77

/LEADER TRAILER CODE
/PUNCH C (AC)
/ANOTHER L-T CODE OR NOT?
/GO PUNCH ANOTHER
/EXIT

/FIRST TWO OCTAL DIGITS IN AC 5-1 1
/PUNCH C (AC)

/LAST TWO OCTAL DIGITS IN AC 6-11
/PUNCH C (AC)
/EX I T
/ROUTINE TO PUNCH C (AC)
/AND EXIT WITH C (AC)
/UNALTERED
/PUNCH I T
/EX I T

To use this program with the ASR-33 make the following changes:.

7466
7562
7564

6046
6041
6046

TLS
TS F
TLS

/INITIAL PUNCH
/AND EXIT WITH C (AC)
/PUNCH I T

Digital-8-5-U-Sym
Page 6

11.

DIAGRAM

11.1

Flow Chart
Note that in this diagram circles represent subroutine utilization
not connectives.
START

INITIALIZE

BPUN
JMS PLOT

PUNCH LEADER

HLT
NB

j
NXBL

HLT
STL

ENTER NUMBER
OF BLOCKS

ENTER BLOCK
I A AND FA

1
11
TAD CKSM
JNS BlNP

I
PUNCH.
CHECKSUM

PUNCH 2
INCREMENT CUSM

JMS PLOT

TAD I I A
CLL

JMP NXBL

Q
JMP PUNL