Digital PDFs

MAINDEC-12-D8AB-D-P

August 1969

20 pages

Original

0.5MB

Document:	Relay Register Test
Order Number:	MAINDEC-12-D8AB-D-P
Revision:	0
Pages:	20
Original Filename:	http://bitsavers.org/pdf/dec/pdp12/diagnostics/MAINDEC-12-D8AB-D-P_Relay_Register_Test.pdf

OCR Text

IDENTIFICATION
Product Code:

Maindec 12-D8AB-D(P)

Product Name:

PDP-12 Relay Register Test

Date Created:

August 1, 1969

Maintainer:

Diagnostics Group

Author:

J, Kelly

ABSTRACT
The relay register diagnostic and exerciser consists of three (3) separate programs. The first,
and major, program thoroughly diagnoses and exercises the relay flip flop register on a bitby-bit basis. The second routine is a three instruction loop which allows the service engineer to transfer the contents of the right switches RSW bits 6
l 1 into the relay
register. This is useful for signal tracing and setting specific number patterns into the relays.
The third and last routine alternately sets and clears the entire relay register at a 100 millisecond rate, as determined by the teletype logic. This program allows the service engineer
to examine the electromechanical characteristics of the actual relays themselves.

REQUIREMENTS
2. 1 Equipment
a.
b.
c.
d.

A standard basic PDP-12 computer
A DR-12 relay register option
ASR-33 teletype
An oscilloscope (needed only if you wish to examine the relay characteristics.)

2. 3 Pre I im inary Programs
All basic PDP-12 instruction diagnostic programs must have been successfully run prior to
attempting to test the relay register.

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:
a. Set the teletype reader switch to FREE •
b. Open the teletype reader and insert the program tape so that the arrows on the
tape are visible to, and pointing toward the operator.
c. Close the reader and set the reader switch to ST ART.
d. Set the teletype front panel switch to ON LINE.
e. Set the LEFT switch to 7777.
f. Set the RIGHT switch to 4000.
g. Set the MODE switch to 8 mode.
h. Depress 1/0 preset.
i. Depress START LS.
i. When the program tape has been read in the computer will halt.
k. The ACCUMULATOR must be= 0000, if it is not, a read in error has occurred and
one might try reloading the binary loader.
I . Remove the program tape from the reader.

STARTING PROCEDURE

4. 1 Starting Address

"RELAY FLIP FLOP REGISTER TEST"

Th" major diagnostic and exerciser "Relay Flip Flop Register Test" starts at address 20 to
run th is test precede as fol lows:
a. Set the MODE switch to 8 mode.
b. Set IF = 0, DF = 0.
c. Depress 1/0 preset.
d. Depress ST ART 20.
e. The LSW and RSW have no effect on th is test.
The state of all other switches, i.e. LEFT, RIGHT and SENSE switches, have no effect on
this roudne. This test, once started will run continuously with no halts. If it should halt,
indicating an error, consult section 5 of this write-up along with the program listing. This
test must be allowed to run for at least 2 minutes.
"RSW TO RELAY TEST"
The second test "RSW To Relay Test" starts at address 1000 and once running transfers the
contents of RSW bits 6 through 11 into the relay register. This program does not perform
any error checking and is intended solely as a visual display and signal tracing aide. To
start it, as follows:
a.
b.
c.
d.
e.
f.

Set the Mode switch to LINC.
Depress 1/0 preset.
Set 1000 into the LEFT switches.
Depress START LS.
Set RSW - 0011.
Set any combination of numbers into the right most 6 switches bits 6 through 11 in
RSW and observe that the same data appears in both the RELAY REGISTER indicator
lamps and the accumu later.
g. It should be noted that RSW bits 0 through 5 also appear in the AC but have no
effect on the relay register.

"RELAY TEST"
The third and final test is designed to allow the service engineer to ob&erve the relay switching
action. By applying a small DC voltage through the relay contacts being tested thence to
the oscilloscope, one may observe the make-break action of each relay contact. Normally,
this test need not be run unless a specific relay problem is suspected. To run this test proceed as fol I~
a.
b.
c.
d.

Set the MODE switch to LINC mode.
Depress 1/0 preset.
Set LEFT switches to 1003.
Depress ST ART LS.

All relay indicaters along with the entire accumulator will alternately set and clear at a
millisecond rate.
5.

ERRORS
Any errors which occur while running the RELAY Flip-Flop register will cause the computer
MEMORY ADto halt at a predesignated address. This address which appears in the
DRESS register along with the data appearing in the ACCUMULATOR and the RELAY
REGISTER indicators allows us to ascertain the nature of the failure. Al I errors are I isted
below:
C(MA)

C(AC)

C(RELAY)

0025

0000

Any bit set in either the AC or
Relay register was not cleared by
1/0 preset.

0033

0000

RTA from a cleared relay register
failed to clear the entire AC.

0041

7777

ATR modified the AC. The AC was
set to 7777, ATR was issued, it should
have left the AC as 7777. The state
of the relay register is not checked
at th is time.

0047

0000

ATR modified the AC. The AC
was set to 0000, ATR was issued;
it should have left the AC as 0000.
The state of the relay register was
not checked at this time.

0056

0001

AC11 transfer to and from relay
5 failed.

0065

0002

AC10 transfer to and from relay
4 failed.

0074

0004

AC9 transfer to and from relay
3 failed.

0103

0010

ACS transfer to and from relay
2 foiled.

0112

0020

AC7 transfer to and from relay
1 failed.

0121

0040

AC6 transfer to and from relay
0 failed.

EXPLANATION

0130

0077

ATR RTA 77 foiled.

0137

0076

ATR RTA 76 failed.

0146

0075

ATR RTA 75 foiled.

0155

0073

ATR RTA 73 failed.

0164

0067

ATR RTA 67 foiled.

0173

0057

ATR RTA 57 failed.

0202

0037

ATR RTA 37 foiled.

0260

0052

The number 52 was loaded into the
relay register and read back 20
consecutive times before testing.
The AC and relay register should be
identical, if any differences occur
that relay flop is bad.

0344

0025

Same as previous test.

0417

0077

The relay register was loaded with
with 77, read back complemented
Loaded again, etc., 12 times. The
Accumulator and the relay register
should both equal 77. Any differences
indicate the failing bit.

0456

xxxx

This test is a random number test
wherein random numbers are loaded
into and read out of the relay register. The AC bits 6 through 11 contain
the data which was sent to the relay
register. The relay register contains
the actual data received.

0471

0077

The AC was dlstrubed while trying
to load the relay register.

0475

0077

The relay register was disturbed. A
test was performed on M115 LOS of the
relay register gating. The test caused
at least one of the inputs of the "AND 11
gate to be disqualified inhibiting the
ATR command.

0550

0052

The relay register was loaded with
52, read back complemented loaded
again, etc. , 12 times. The accumulator and the relay register
should both equal 52, any differences
indicate the failing bit.

APPENDIX A
PDP-8 MODE PERFORATED - TAPE LO.&\DER

READIN MODE LOADER
The readin mode (RIM) loader is a minimum length, basic, perforated-tape program for the
33 ASR. It is initially stored in memory by manual use of the operator console keys and
switches. The loader is permanently stored in 18 locations of page 37.
The RIM loader can only be used in conjunction with the 33ASR reader (not the high-speed
perforated-tape reader). Because a tape in RIM format is, in effect, twice as long as it
need be, it is suggested that the RIM loader be used only to read the binary loader when
using the 33 ASR. (NOTE: Some PDP-12 diagnostic program tapes are in RIM format).
The complete PDP-12 RIM loader (SA= 7756 is as follows:
Ao5oiute
Address

Octal
Content

7756
7757,
7760
7761,
7762,
7763,
7764,
7765,
7766,
7767
7770,
7771,
7772,
7773,
7774,
7775,
7776,
7777,

6032
6031
5357
6036
7106
7006
7510
'.5357
7006
6031
5367
6034
7420
3776
3376
5356
0
5XXX

Tag

Instruction I Z

BEG,

KCC
KSF
JMP -1
KRB
CLL RTL
RTL
SPA
JMP BEG +1
RTL
KSF
JMP -1
KRS
SNL
DCA I TEMP
DCA TEMP
JMP BEG
0
JMP X

TEMP,

Comments
/CLEAR AC AND FLAG
/SKIP IF FLAG= 1
/LOOKING FOR CHARACTER
/READ BUFFER
/CHANNEL 8 IN ACO
/CHECKING FOR LEADER
/FOUND LEADER
/OK, CHANNEL 7 IN LINK

/READ, DO NOT CLEAR
/CHECKING FOR ADDRESS
/STORE CONTENT
/STORE ADDRESS
/NEXT WORD
/TEMP STOR.A.GE
/JMP START OF BIN
LOADER

Placing the RIM loader in core memory by way of the operator console keys and switches is
accomplished as follows:
a.
b.
c.
d.
e.
f.

Set the starting address 7756 in the LEFT switches.
Set the first instruction (6032) in the RIGHT switches.
Press the FILL switch.
Set the next instruction (6031) in the RIGHT switches.
Press the FILL STEP switch.
Repeat steps d and e until all 16 instructions have been deposited.

To lead a tape in RIM format, place the tape in the reader, set the LEFT switches to the
starting address n56 of the RIM loader (not of the program being read), press the START
LS key, and start the Teletype reader.

)

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TESTS

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01;:6
0127
0130

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0133
0134
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0136
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0151
0152
0153
0154
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0164

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0157
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021"
0211
0212
0213
0214
0215
021~

0217

02221
0221
0222
0223
0224
0225
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0227

0230
0231
0232

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0235
0236
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0241
0242
0243
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0246
0247
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ATR
RTA
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ATR
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ATR
RTA
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0262
0263
0264
0265
0266
0267
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0271
0272
0273
k:l274
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0276

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0302

0303

0304

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0325
0326
0327
0330
0331
0332

0333
0334

0335
0336

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lil~H

01D15

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!01:115

e014
0015
0014

rt'115
kiiOl.4

0~15

k'.l014
0015
laiill,4

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ATR

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RTA
ATR
RTA
ATR
RTA

ATR

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0015

0404

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012!15
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RTA
COM
ATR
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PAGE 6

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0426
0427
0430
0431
0432
0433
0434
0435
0436
0437
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