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MAINDEC-12-D8AB-D

December 1969

20 pages

Original

0.6MB

Document:	maindec-12-d8ab-d
Order Number:	MAINDEC-12-D8AB-D
Revision:
Pages:	20
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-12-d8a/maindec-12-d8ab-d.pdf

OCR Text

Qz~~—

Amy‘s

RELAYTST

IDENTIFICATION
Product Code:

Maindec I2~D8AB-D(P)

Product Name:

PDP-I2 ReIay Register Test

Date Created:

August 1, I969

Maintainer:

Diagnostics Group

Author:

KeIIy

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 bit"

The second routine is a three instruction loop which allows the service entransfer the contents of the right switches RSW bits 6 through ii into the relay
This is useful For signal tracing and setting specific number patterns into the relays.

by—bit basis.
gineer to

The third and last routine alternately sets and clears the entire relay register at a l00 milliw
second 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. i Eguipment

To
(1.0

A standard basic PDP-lZ computer
A DR-lZ relay register option

ASR-33 teletype
An oscilloscope (needed only it you wish to examine the relay characteristics.)

2.3 Preliminary Programs
All basic PDP~i2 instruction diagnostic programs must have been successfully run prior to

attempting to test the relay register.
LOADING PROCEDURES
3

l Method

This program must be loaded with the binary loader. it" you are unfamiliar with the proper
binary loading procedures refer to "Appendix A" at this program, otherwise precede with

the following:
a

Set the teletype reader switch to FREE

Open the teletype reader and insert the program tape so that the arrows on the

0.0
:no

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 LlNE.
Set the LEFT switch to 7777.
Set the RlGHT switch to 4000.
Set the MODE switch to 8 mode.

r-y-y-a-co

Depress l/O preset.
Depress START LS.
When the program tape has been read in the computer will halt.
The ACCUMULATOR must be
0000, it it is not, a read in error has occurred and
one might try reloading the binary loader.
Remove the program tape from the reader.
=

STARTlNG PROCEDURE
4.l Starting Address

“RELAY FLlP FLOP REGISTER TEST"

The maior diagnostic and exerciser "Relay Flip Flop Register Test" starts at address 20 to
run this test precede as follows:
Set the MODE switch to 3 mode.

09.030 .-.

Set lF =0, DF =0.

Depress l/O preset.
Depress START 20.
The LSW and RSW have no effect on this test.

The state of all other switches, i.e. LEFT, RIGHT and SENSE switches, have no effect on
this routine. This test, once started will run continuously with no halts. lf 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.
"st TO RELAY TEST”

The second test ”RSW To Relay Test" starts at address 1000 and once running transfers the
contents of RSW hits 6 through ll 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:
.

Set the Mode switch to LlNC.

we Depress l/O preset.
Set 1000 into the LEFT switches.
an Depress START LS.
OO'l l
Set RSW
To Set any combination of numbers into the right
-

most 6 switches bits 6

through ii in

RSW and observe that the some data appears in both the RELAY REGlSTER indicator
lamps and the accumulator.
9.

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 observe the relay switching
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 problemIs suspected. To run this test proceed as follows:

action.

0—0
0.0

Set the MODE switch to LlNC mode.

Depress l/O preset.
Set LEFT switches to 1003.

Depress START LS.

All relay mdrcaters along wtth the entire accumulator wtll alternately set and clear at a

1' ”'7

3 Lw

millisecond rate.
ERRORS

Any errors which occur while running the RELAY Flip-Flop register will cause the computer
to halt at a predesignated address. This address which appears in the (MA) MEMORY ADDRESS register along with the data appearing in the ACCUMULATOR and the RELAY
REGISTER indicators allows us to ascertain the nature of the failure.

All errors are listed

below:

C(MA)‘

C(AC)

0025

0000

C(RELAY)
00

EX PLA NAT lON

Any bit set in either the AC or

Relay register was not cleared by
l/O preset.
0033

0041

7777

0047

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

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 this time.

ATR modified the AC.
was

set to

The AC

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

ACll transfer to and from relay
5 failed.

0065

AClO transfer to and from relay
4 failed.

0074

0004

0103

00i0

AC9 transfer to and from relay
3 failed.
TO

AC8 transfer to and from relay
2 failed.

0ii2

0020

AC7 transfer to and from relay
1 failed.

0i21

AC6 transfer to and from relay
0 failed.

0130

0077

ATR RTA 77 failed.

0137

0076

ATR RTA 76 Failed.

0146

0075

ATR RTA 75 failed.

0155

0073

ATR RTA 73 failed.

ATR RTA 67 failed.

0164

0173

0057

ATR RTA 57 tailed.

0202

0037

ATR RTA 37 failed.

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 flap is bad.

0344

0025

Same as previous rest.

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 tailing 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 distrubed while trying
to load the relay register.

0475

0077

The relay register was disturbed. A
test was performed an M115 L08 of the
relay register gating. The test caused "
at least one of the inputs of the “AND
gate to be disqualified inhibiting the

ATR command.

0550

0052

The relay register was loaded mm
52, read back complemented loaded
again, efc., 12 times. The accumulai‘or and the relay regisfar
should bofh oqual 52, any differences
indicate the failing bit.

APPENDIX A
PEP-8 MODE PERFORATED

TAPE LOADER

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 coniunction 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 POP-12 diagnostic program tapes are in RIM format).
The complete FDP-IZ RIM loader (SA
Absolute
Address

7756 is as follows:

Octal
Content

Tag

7756

6032

BEG,

7757,

6031

KSF

7760

5357
6036
7106

JMP -1

7006

RTL

7510

SPA

7765,

5357

7766,

7006

JMP BEG +1
RTL

7767

6031

KSF

7770,
7771,
7772,
7773,
7774,
7775,
7776,
7777,

5367

JMP ~1

6034

KRS

7420
3776

SNL

7761,
7762,
7763,
7764,

5XXX

KCC

KRB

Comments

/CLEAR AC AND FLAG
/SKIP IF FLAG ,1
/LOOKING FOR CHARACTER
/READ BUFFER
=

CLL RTL

DCA I TEMP
DCA TEMP
JMP BEG

3376
5356
0

Instruction I Z

TEMP,

JMP X

/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 STORAGE
LIMP START CF BIN
LOADER

Placing the RIM loader In core memory by way of the operator console keys and switches Is
accomplished as follows:

roman-o

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 (:1 and e until all 16 instructions have been deposited.

To bad a tape in RIM format,

place the tape in the reader, set the LEFT switches to the
starting address 7756 of the RIM loader (not of the program being read), press the START
LS key, and start the Teletype reader.

ACIE

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