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MAINDEC-12-D1DA-D

1969

20 pages

Original

0.4MB

Document:	Checkerboard
Order Number:	MAINDEC-12-D1DA-D
Revision:	0
Pages:	20
Original Filename:	http://bitsavers.org/pdf/dec/pdp12/diagnostics/MAINDEC-12-D1DA-D_Checkerboard.pdf

OCR Text

IDENTIFICATION
PRODUCT CODE:

MAINDEC 12-DlDA-D(D)

PRODUCT NAME:

PDP-12 CHECKERBOARD

DATE CREATED:

OCTOBER 20, 1969

MAINTAINER:

DIAGNOSTIC GROUP

AU'T'HOR:

HAROLD LONG

ABSTRACT
PDP-12 checkerboard is designed to test the operation of the
PDP-12 memory, from 4 to 32K.
It accomplishes this by using
the L mode instructions LAM (link & AC added to memory, sum
in AC and memory), ADM (AC added to memory, sum in AC and
memory), a~d SAE (skip if accumulator is equal to designated
memory register). The algorithim used for testing is to first
set the memory cell under test to 52521 second, set the AC to
6525, and rotate it into the line one place, resulting in the
AC= (1) 5252 (the (1) indicating the link is set)r third,
a LAM is performed into the test cell and two comparisons
made; once for the AC = 2525, and once for memory equal to
the AC. Fourth, an ADM is performed~ since the AC is now
equal to 2525, and memory equal to 2525, the sum will be 5252.
Another test of the AC and memory is made.
If any of the
comparisons fail, an error routine is enteredr otherwise, the
memory target address is incremented and testing continued.
This test will cycle throughout all available memory, a.s
determined by the right switches.

REQUIREMENTS
2. 1 Equipment
a)
b}

Any PDP-12 computer, (with or without EXT. memory)
An ASR-33 teletype or equivalent.

2.2 Preliminary Programs
a)
b}

Insure that the binary loader is operating properly.
If this test will not run as indicated, verify processor
operation with CP Test 1 (INSTST). No other programs are
necessary.

LOADING PROCEDURES
3.1 Method
This program must be loaded with the binary loader. If you
are unfamiliar with the proper binary loading procedures
refer to "Appendix A" of this program, otherwise precede
with the following:

al
b)
c)
d)
e)
f)

g)
h)
i)

Set the teletype reader switch to FREE.
Open the teletype reader and insert the program tape so
that the arrows on the tape are visible to and pointing
toward the operator.
Close the reader and set the reader switch to START.
Set the teletype front panel switch to ON LJNE
Set the LEFT switches to 7777.
Set the RIGHT switches to 4¢¢¢.
Set the MODE switch to 8 mode.
Depress I/O preset.
Depress START LS.

j)
k)

STARTING PROCEDURES
a)
b)

c)
d)

'..then the program tape has been read the ACCUMULATOR
must be ¢¢¢¢ if it is not, a read-in error has occured
and one might try reloading the binary loader.
Remove the program tape from the reader.

Set the RIGHT Switches SR7 thru 11 to the amount of memory
available, in lK segments, within the range ¢ to 37.
(In a 4K machine this would be ¢¢¢3).
Set the MODE switch to B mode.
Depress I/O preset.
Depress START 20.
The program, when properly running, will cause the data
field lights to appear to be counting up, and the teletype
bell to ring at intervals dependent upon the amount of
memory being tested.
Attempting to test non-existant memory may result in
program destruction or false error printouts.

ERROR ROUTINE
5.1 Switch Settings
In general, SR¢-3 allows selection of the error mode. With all
switches equal to zero, the sequence would be:
(HLT) - OPERATOR SELECTS ANY ADDITIONAL ERROR OPTIONS AND
DEPRESSES THE CONTINUE SWITCH (ERROR PRINTOUT) - (NEXT CELL TESTED)
SR¢¢ = l SUPPRESS HALT
SR¢1 = l SUPPRESS PRINTOUT
SR¢2 = l SCOPE LOOP ON FAILING CELL
SRf{f 3 = l LOOP ON SELECTED FIELD
With SR¢3 = 1, the right switches ¢7-11 must contain the
field you wish to test, within the range ¢ to 37. The diagnostic
will cycle within this field, stopping only in the event of
an error.
SR¢4 = 1 DUMP PASS COUNTER
Setting this switch to a one causes a type out of the contents of
the pass countero A start 2¢ will set the counter to ¢¢¢¢.
SR¢5 = l INHIBIT BELL RING AT END OF PASS.
5.2 Error Printout
The error printout has the following general forms
LINC CHKB
FIELD LOCN
0007 0400
0007 0400

CONT
2524
5202

ACUM
2525
5202

The message is interpreted as follows:
FJELD - The data field being tested, within the range 0 to 37.
LOCN - The 10 bit address within that field.
CONT - The contents of that location; this should equal the AC.
ACUM - The contents of the AC. This should equal either
2525 or 5252.
5.3 Error Analysis
Compare the memory contents against the contents of the AC.
In the first example, it is apparent that the AC is correct,
indicating proper data acquisition, but that memory is bad,
indicating poor write response in memory - this could be
either inhibit current, memory timing, or bad cores.
In the second example, both memory and the AC are the same,
but the data is bad, indicating poor read response. This
could be marginal sense amps, memory timing, or bad cores.
These are examples only, and are not to be taken as a hard

& fast rule.

0'-"00
0iHH
0002
0003
121004
0170?
0006
007
00H
0011
0~H2

0013
;:)014
iZ015

0016
0017

0020
0021
0022
0023
0024
0025
0026
3027
·~0 ,10

0031
0032
0033
0034
00 S5
<J0 S6

0037
004>0
00 4:i

0042
0043
0044
3045
0046
0047
.J050

*20

tPDP-12 CHECKERBOARD, MAJNDEC 12-01DA-l
/COPYRIGHT DIGITAL EQUIPMENT CORP,, MAYNARD, MASS.

/AUTHOR: HAROLD LONG
I

TEST IS DESIGNED TO CHECK THE OPERATION
POP-12 INSTRUCTION "Lt,M".
/IT MAKES USE OF THE "READ -MODIFY -~RITE
/~EMORY CYCLE TO TEST MEMORY REL!ABL!LiTY.
/THE PROGRAM OCCUPIES CELLS 0000 TO 0300
!IN BANK 0. IT WILL CHECK ALL OTHER MEMORY
/AVAILABLE.
/THE ALGORITHM USED FOR TESTING IS T SET
/THE MEMORY CELL UNDER TEST TO 5252, AND THE AC
/THE AC IS ROTATED INTO THE LINC ONE PLACE
/AND A LAM TO THE TEST CELL EXECUTED
IA SAl IS EXECUTED FOR TESTING PURPOSES AND THE
/ROUTINE CONTINUED
/AN ERROR WILL CAUSE ENTRY INTO THE
/ERROR ROUT I NE
/1H!S
/Jf

525.

I
I
I

/SWITCH SETTINGS:
I

/RSW
/RSW
/RSW
IR SW
;R SW
/RSW
I

00=1, INHIBIT ERROR HALT
01=1, INHIBIT ERROR TYPEOUT
02=1· SCOPE LOOP ON FAILING CELL
0 3:: 1 • SCOPE LOOP ON SELECTED BANK
fl4= 1 • DUMP PASS COUNTER
05=L INHIBIT BELL

/RSW 1'.17 TO 11 ARE SET TO THE HIGHEST MEMORY BANK AVAILABLE•
/WITHIN THE RANGE 0 TO 37.
IN A 4K MACHINE, THIS WOULD BE
/0003;
WITH RSW 03=1, THE DESIRED BANK MUST BE IN THE SWITCHES.
I
I

ll/O PRESET TO 8 MODE,
I

EJECT

START 20

1!051
0052

3053
;)054

0055
.U5'1

/TAGS ANO

CO~STANTS

PM ODE
? ? 210

AUT01,

2~51

.4JT02,
ilS..i8,

';; (

A0T05,

<>0001
2000
2351
n20

.:'.? '.i ~
c

zz '.)

Z2'l1
z~" 02
- i ~ 3
Zt04
: z5

2263

.:'2 i'6

JZ64

~'·' :'2

Z?. 2 7

,3 ?~2

'.'-~LSSA,

2365

221?

2?22

AL'T010,

K215-1
0e00

2066

~211

~.::1 ~~

TEMP,

0000

2067

·z 212

0070

2213

"<1026,
"< 77 7 4,

Hl 2 6
7774
0000

V'.i>l 57

: .; 6 2

_· z2 z
/ ~· zz
_-,

~UT04,

ERROR1, 0000

0071

0214

·, ~ 26
. ., . ., 7 4
J?,0

0il72

2?15

ll3

REGS,
MASK,

ll073
3074
0075

0016

"42

K0240,

0217

200

0076

2062

zn0

BANK,
I

EJECT

0033

0240
0000

f.107/

0 00
;3101

PM ODE
I

0Hl2

/MAJOR START 8 MODE

rJHl3

JH'.4
?'c 05

'4 :1

.. l

/ ;~? 3

1 2

'~ 11
l 1:i4

25
26

1"'
.... j

~"'"

L l :\

tGO TJ LINC MODE

L[-100[

_.,.,1.\".._,

*0020
START,

"~ I)
.~

Ad 7' 2.:;

/RESET PASS COUNTE

SET l

A J T 0 '.)

/RESET PSS

RESET

/STA T WITH BANK 0
/READ THE SWITCHE
/SAVE BITS 1217-11

RS i'./8

/SAVE FOR ITERATION
/F!XEJ FIELD?

SE 7
.;;

3 0C
65

0122
0123
0124
0125
01 26

6034

7'377

v 35

0450

36
li>J37
40

6133

01 ?7

.~041

2516

0130

~:;;

42
i0 43
'30 4 4
V'.0 45
00 46

"560

JMP
fi'S w
BCL I
7740
STC
RSW
9CL I
7377
HE
JMP
SET
AUT02
RSW
BCL I

7577

08 4 7
;;(fi 50

3450
6333
10 20
::J640
2'H7

AH
JMP
LD A l
LOF
ADD
STA
CHANGE
STA
CHANG2
STC

'.,6

l 1

7 7

11 I
1?0

ZC31
;32
;~ ;33 3

a12:

0131
0132
0133
0L54
0135
0Li6
0137

0140
0141
Jl t,2

0143
01 44

51
0052
0 53
(IQ'.54
MJ55
Jt)

MULT!P~l

0000
!)•,'.

4 ii'.
4 03
1
.

3t 6

5se
0t41
·ii

GC,

lvj 40
02 00
1iil40
.1207

4056
EJECT

FlLD1
AUT01

!CHECK FOR SWITCH 03
/WAS IT THERE?
/SET FOR FIXED FJELD
!SET LOWER LIMIT
/READ THE SWITCHES
!SAVE SW 04

DUKP

!IS IT SET?
/YES, TYPE PASS COUNTER
/PICK UP LDF

BANK

/ADD NEW BANK NuMBER
/RESET INTERNAL LDF

SETB

/STORE FOR EXECUTION

'0146
° :>
1"!

0147
01511l
0151
?152

/TEST MEMORY WITH LAM, ADM, AND SAE

ces6

?2100

0V57

·.0011
1 r12v6525

//6'l

015"'.

V?f1

2154

;·? 62

01 ')5

SETB,
BACK,

;>{,:
114'...

0000
CLR
LOA I
6525
ROL I
STA

J156

··~· 64
63
.:?

.. Lt . . ._

LAM

0157

<1265

'.. 4 6t:l

0160
il161
0162
016.3

0.166
0J67

;5z5

SAE I
2525
JMP
SAE
JMP
ADM
SAE I
5252
JMP
SAE
JMP
XSK I
JMP
XSK I
LOA
BANK
COM
ADD
ADD
APO 1
JMP
EJECT

~164

016!:>
iilJ. 66
0167
0170
0171
0172
0173
0174
0175
0176
3177
0200
0201
0202
02e3
3204

rzn

... ?

6 '. 51
: •141

1n1

6151

{.1c"'72
v.;>73

1460

iZ74

5252

1:41

~0 n5

61 :51

0e76
0077

Ctel
tHl1l2
eie3

1441
6151
nz1
5.il57
J(37
~- :300

l'.;104

J017

0105
0Hl6

2003

dlil;{\

21017

011iC

2252
0471

Zill

6~46

(~107

INCRN,

/EXECUTE LDF
/CLEAR LINK
/PICK UP CONSTANT
1
AUT01
AUT01

/SET LINK, JUSTIFY
/!NO!'<ECT TO OF
/AQD (AC~N&L!NKJ=252~
/AC OK?

ERROR
AUTO!
ERROR
AUT01

/NO. GO TYPE MESSAGE
/MEMORY OK?
/NO, GO TYPE MESSAGE
/ADD THEM TOGETHER AGAIN
ITES"T

ERROR
AUTOl
ERROR
AUTOl
BACK
BANK

RSWB
K0001
GO

/TEST MEMORY
/INCREMENT TARGET
/TRY ANOTHER CELL
/WILL NEVER SKIP
/PICK UP BANK
/COMPLEMENT
/COMPARE WITH RSW
/LAST BANK?
/NEW BANK

02;!)5

1?112
113

J77

225
16

207
l2 H>:
0211

8CL

21?

7o7

2
; '22
« 1 23
' 124

;·:. 25

.>15;:1

,\ E

2'6

JMP

'126

26
?226
22 7
.:2 3iiJ
it231
;:? 32

AUTOS

/RESE,

/TO i!:EROS
/P SS MULT PL! ER
/NO SKIP ANTED
/READ T E SWITCHE
5
/Si\VE S
I IS

STi\RT+6

;YES, l NH! 8 i BEL
/PICK lJP ONS NT
!BELL CODE

OOE

41'

/RING JT

LMOOE

t223
;: ~ 4

BANK

2
07
;r;, iZ

Z221
c ::

SET l
00
XSK l

RSW
~

R SET,

0000

1;;?

5 iZ ~'.
P"'IQ[)

1 ,,.,
"' '->':'

TSF

:) 4J

/WAIT

LMOD
131
132

6127
6126

EJECT

JMP

• -2

JMP

START+6

/NEXT PASS

0233
0234
0235
0236
0237

0133
kl134
0135

0516
1560

/RlAO

RSW
BCL

7740
l261

SET I
3777

?137

3777

:3140
;,;141
:· 142

'.' j

0243

0245

'..143
;J; ~ 4 4
(1 145

5Z46

02'16

"·~14 6

2'~141

02 4 7

V147

0250
?l?.:51

1:152

11'.'. ;>2
61Z·ZJ

A~E

,,. 4 6

J~P

~ J 4 ['
JJ17
4 ;~ 0 :3

STA

SET2

/NOW SEE rr F"IELD 0
/IT WAS

GO
AUTOl

/SET UP LIMIT
BUFrER
/BACK TO MAINLINE
If" !ELD fil

/8ACK TO FIELD

3At.iK

SET2,

SET

AUT02
JMP
EJECT

A~AlN

/IN f"JELD 0?
/TRY FOR ~HOLE f"!ELO

STC
JMP

~WllCHl~

AUTOl

7740

;1136

024e
0241
vP42
L.2 44

r I LDl.

RSwB

I INTO

1:11
01

0254
0255
0256
0257
0260
0261
0262
ll263
026.6
0265

0266
0267
0270

02 71
0272
0273
0274
0275
0276

0153
0154
0155

0156
13157
n6e
l161
2162
J163
0164
0165
J166
l167
0170
0171
0172
e173
0174
0175

0277

0176

0300
0301
0302
0303
0304
0305
0306
03 07
0310
0311
0312
0313
0314
0315

~1177

0200
e201
0202
0203
0204
0205
02 06
~2 07

iiJ2Hl
0211
0212

4006

ERROR,

0516
0471

APO I

0000

0241
0471
6164
11241
2471

CHECK,

6100

6057
1000

TYPE,

/l;;l~d3

~470

6213
1000
0017
6226
1000
0001
1560
6000
6226
0000
HHll

6226
1000

0006
6226
6316
0000
0516
0241
6160

ERRORl

HLT
ROL
APO I
JMP
ROL
APO I
JMP
JMP
LOA
AU TO 1lil
Ai!E I

JMP
LOA
BANK
JMP
LOA
AUT01
BCL I
6000
JMP
CHANGE, 0000
LOA
JMP
LOA
ERROR1
JMP
JMP
CH AN G2 , 00 00
RSW
ROL
JMP
I

EJECT

1
TYPE
1

INCRN
BACK

HEAD
OUTYP

OUTYP
AUT01
OUTYP
OUTYP
CRLF
1
CHECK

/SAVL
/READ TH£ SWITCHES
/SWITCH 0
i?
/NO, STOP
/ROT ATE
/SWITCH 1 SET?
/NO, TYPE ERROR
/ROTATE
/SWITCH 2 SET?
/NO• TRY NEW CELL
/YES, USE SAME CELL
/CHECK FOR HEADING
/MESSAGE POINTER
/WAS l T TYPED?
!NO, GO TYPE IT
/GET BANK UNDER TEST

IT YPE ! T

/10 BIT ADDR
/TYPE CELL LOCATION
/CHANGE DATA FIELD
/GET CELL CONTENTS
/TYPE IT
/TYPE CONTENTS OF AC
/RETURN AN 0 LI NE FE ED
/CHANGE DATA F !ELD
/READ SWITCHES AGAIN
/JUSTIFY
/CHECK WITH MONITOR

0316

/TYPEOUT ROUTINES

0317
03~0

0321
0322
0323
21324
0325
0326
:1327
033il
0331
0332
21333
0334
0335
0336
0337
0340
0341
0342
0343
0344
0345
0346
0347
0350
0.351
0352
0353
0354
ill355
2356
0357
0360
0361
111362
0363
0364
111365
0366

'11213

0002

0214
0215
0216
0217
e2211l
2221
e222
0223
e.224

6201
1007
3010
7450
5224
4325
5217
6141

e225
0226

6000
0002

0227
0231'/l
0231
0232
0233
0234
0235
0236
0237
024fll
0241
0242
0243
0244
0245
0246
0247
025111

3011
1013
3014
1012
3010
1011
7004
3011

0251

6000

HEAD,
PM ODE

1410

POP

/GO TO PMOOE

00
CDF
TAD
MESSA
AUT010
OCA
AUT010
TAD I
SNA
,+3
JMP
PRINT
JMS
JMP .-4
LI NC

/DATA FIELD 1

JMP
POP

liJ

/RETURN
/SACK TO PMODE

OCA
TAO
OCA
TAO
OCA
TAO
RAL
OCA

TEMP
K7774
REGS
KUJ26
AUT010
TEMP

/SAVE DATA
/SET REGISTER
!TO -4
/GET CONSTANT
/SAVE
/GET DATA
/ROTATE
/SAVE IT
/GET CONSTANT
/ROTATE
/OK TO PRINT?
/NO, ROTATE SOME MORE
/YES TYPE IT
/DONE?
/NO
/PICK UP SPACE CODE
/TYPE IT
/BACK TO LMODE

LMODE
OUTYP,
PM ODE

HERE,
REDO,

Hl10

TAO

7004
7420
5233
4325
2014
5232
1016
4325
6141

RAL
SNL
JMP
JMS
!Sl

JMP
TAD
JMS
LINC

TEMP
AUT010
REDO
PR INT
REGB
HERE
K024111
PRINT

U10DE
0252

0,.,1111

JMP
PM ODE
K111fll01,
EJECT

0001

111

/SET UP HEADER
/GET FIRST CHARACTER
/DONE YET?
/YES
/NO, pRINT CHARACTER
/GET NEXT CHARACTER
/BACK TO LMODE

/RETURN

/MESSAGE TABLE

0371
0372
0373
12!374
12!375
0376
0377
0400
0401
0402
0403
0404
0405
0406
0407
0410
0411
0412
0413
0414
0415
0416
0417
0420
0421
0422
0423
0424
0425
"J426
0427
0430
0431
0432
0433
0434
0435

0253
0254
0255
0256
0257
0260
0261
0262
0263
0264
0265
0266
0267
027121
0271
0272
0273
0274
0275
0276
0277
031110
031!:'1
Ql302
0303
0304
0305
0306
0307
0310
0311
0312
0313
111314
0315

0215
0212
0314
0311
0316
0303
0240
0303
0310
0313
0302
0215
0212
0302
0301
0316
0313
0240
0314
0317
0303
0316
0240
0303
0317
0316
0324
0240
;1301
0303
0325
0315
0215
0212
0000

K215,
1<212.

EJECT

0215
0212
0314
0311
0316
0303
0240
0303
0310
0313
0302
0215
0212
031212
0301
0316
0313
0240
0314
0317
111303
111316
0240
0303
0317
0316
111324
0240
0301
0303
0325
0315
0215
0212
0000

/LINC CHKB
/BANK LOCN CONT ACUM

/END

S!.3~

/TYPE CARRIAGE RETURN

21437
0440
0441

0442
0443
0444

0445
0446
0447
0450

0316

11J002

0317
0320
0321
11322
0323

1253

0464

U100E
CRLF,
PM ODE

TAD

JMS

6141

/BACK TO PMOOE
K215
PR I NT
K212
PRINT

LI NC

LMODE
0324

JMP

6000

/SINGLE CHARACTER PRINT ROUTINE
I

0325
0326
0327
0330
0331
0332

0MJ0
611J46
6041
5327
7300
5725

PMOOE
PR INT,

0000
TLS
TSF
.-1
JMP
CLA CLL
PRINT
JMP I

/PASS COUNTER DUMP ROUTINE

0467
0470

0500

051111
0502

/PRINT CHARACTER
/WAIT

0466

0472
04 73
04 74
134 75
lil4 76
0477

/RETURN

0465

13471

LINE FEED

POP
TAD
JMS

4325
1254
4325

0451

0452
0453
0454
0455
0456
0457
0460
2461
0462
0463

~NO

0333
0334
0335
0336
11J337
0340
0341
0342
0343

0044
0000

LMODE
DUMP,

HHl0

0005
6226
6316
11Jl1J711J
0000
6004

SET
0
LOA
AUT05
JMP
JMP
SET I

AUT04

/SAVE RETURN
/GET PASS COUNTER

OUTYP
CRLF
AU T0113

!GO TYPE PASS COUNTER
/GO CR-LF
/CLEAR AUT010 TO ALLOW HEADER TYPEOUT

AUT04

/RETURN TO MAINLINE

0000

JMP
I

0503

/LINGKBD MODEL C

es~4

AUTO:!.

Hl'l1
AUT010 e0a
AUT02
0002
AUT04 (1;004
AUT05
0005
0057
BACK

BANK

Q\017

CHANG:O:
CHANG2
CHEC"
CR Lr

ez00
0207

FILOl
GO
HEAD
HERE
INCRN

0133
e046

KrllliHH
K0240

0252
0016

016;>,
k:J316
DUMP
i'.'.333
ERROR 0151
£RR0Rl 0006

0213

iZ232
~10i'.'

K1f26

.,111.12

K2l.5
K7774

0013

MASK

0015

MESSA

0007
f.:l226

K212

OUTYP
PRINT
Rt OU
nEl.)b
n~.-

~n;in~

JRVA
~o:::A

0254
0253

0325
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t,l'Jl.'i
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... .). ..... £.
Q .. :11.

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9~4 '.)

sE re:

ftl 1~ 6

START
TEMP
TYPE

0020
0011

0164