Digital PDFs

MAINDEC-12-D1DA-D

1969

20 pages

Original

0.6MB

Document:	Checkerboard
Order Number:	MAINDEC-12-D1DA-D
Revision:	000
Pages:	20
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-12-d1d/maindec-12-d1da-d.pdf

OCR Text

C 812
IDENTIFICATION

_,
)

PRODUCT

CODE:

MAINDEC

PRODUCT

NAME:

POP—12

12-D1DA—D(D)
CHECKERBOARD
‘

20,

1969

MAINTAINER:

DIAGNOSTIC

GROUP

AUTHOR:

HAROLD

DATE

CREATED:

OCTOBER

LONG

DIGITAL EQUIPMENT CORPORATIon

“1

ABSTRACT

PUP-12
PDP~12
the

checkerboard

designed

the

test

operation of the

It accomplishes this by using
memory, from 4 to 32K.
mode instructions LAM (link & AC added to memory, sum
and memory), ADM (AC added to memory, sum in AC and

memory),

and

(skip

accumulator

equal to designated
testing is to first
5252: second, set the AC to
6525, and rotate it into the line one place, resulting in the
AC
(l) 5252 (the (1) indicating the link is set): 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.
SAE

used

The algorithim
memory register).
set the memory cell under test to

for

Another

fail,

will

test

determined

and

If any of the
memory is made.
routine is entered; otherwise, the
incremented and testing continued.

error

target address

memory
This

the

test

comparisons

cycle throughout all available memory,
right switches.

the

REQUIREMENTS

Eguipment
a)
b)

(with

Any PDP~12 Computer,
AER-33

teletype

without

EXT.

memory)

equivalent.

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

(INSTST).

other

programs

are

necessary.
LOADING

PROCEDURES

M35222
This
are

If you
program must be loaded with the binary loader.
unfamiliar with the proper binary loading procedures

refer

with

the

a)
b)

Set

"Appendix A“
following:
the

Open

the

that

the

this

otherwise

teletype reader switch to FREE.
teletype reader and insert the
arrows

the

toward the operator.
Close the reader and

6)
e)
f)

Set

the

teletype

Set

LEFT

Set

the
the
the

h)
i)

Depress
Depress

Set

program,

RIGHT
MODE

Switches
switches

I/O preset.
START

set

front

switch
LS.

tape

the

are

visible

reader

panel switch
to
to

7777.

wed.
mode.

program tape so
to and pointing

switch
to

procede

LINE

START.

when

the

must

and

one

Set

PROCEDURES

the

(In

Switches

RIGHT
in

4K machine this
the MODE switch to

Depress

thru 11 to the amount of memory
within the range w to 37.
would be ¢¢¢3).
SR7

segments,

Set

d)
e)

been

not,

tape from the reader.

program

available,
b)
c)

read the ACCUMULATOR
read—in error has occured

has

might try reloading the binary loader.
the

Remove

STARTING

program tape
if it is

fifififi

mode.

I/O preset.

Depress START 20.
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
The

being tested.
Attempting to test non—existent memory may result in
program destruction or false error printouts.

memory

ERROR

ROUTINE

Switch
In

Settings
With

general, SRfl-B allows selection of the error mode.
equal to zero, the sequence would be:

all

Switches

(BLT)

OPERATOR

—

SELECTS

DEPRESSES

(ERROR

PRINTOUT)

1
SW95
1
SRm
1
smz
1
81653
With SR¢3
field

will
an

THE

ANY

SUPPRESS

HALT

SUPPRESS

PRINTOUT

SCOPE

LOOP

the

ERROR

OPTIONS

AND

(NEXT CELL TESTED)

LOOP

you wish to
cycle within

ADDITIONAL
SWITCH

CONTINUE

FAILING

SELECTED

CELL

FIELD

right switches fl7—ll must contain the
The diagnostic
test, within the range fl to 37.
this field, stopping only in the event of

error.

SR¢4

DUMP

PASS

Setting this switch
the

pass

SRES
Error

The

COUNTER
to

one

causes

countera
A start 2¢ will set
l INHIBIT BELL RING AT END OF

type
the

out

counter

PASS.

Printout

error

printout has the following general

LENC

CHKB

FIELD

LOCN

CONT

0007

0400

2524

2525

0007

0400

5202

S202

ACUM

form:

the
to

contents

flfififl.

The

message is
The
FIELD
-

LOCN

The

CONT

The

ACUM

Error

interpreted

follows:

oata field being tested, within the range 0 to 37s
10 bit address within that field.
contents of that location; this should equal the AC.

The contents of
2525 or 5252.

the

should

This

AC.

equal

either

Analxsis

against the contents of the AC.
that the AC is correct,
indicating proper data acquisition, but that memory is bad,

Compare the memory contents
In

the

first

example,

apparent

indicating

either

poor write response
inhibit current, memory

timing,

memory

this
bad

could

cores.

the second example, both memory and the AC are the same,
the data is bad, indicating poor read response.
This
could be marginal sense amps, memory timing, or bad cores.
In

but

These are examples
& fast rule.

only,

and

are

not

taken

hard

AVAILABLE, NOLO

6’25.
TD

MAS .

12leDA~L

MAYNARD. OPERATION ~NRITE 236% MEMORY

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SE7 SET JMP RSN BCL STC RSW

6:43

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PMODE {MAJOR “@029 START, LMODE
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BANK? BANK
/LAST /NEN

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/

INCRN.

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ER OR.

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TYPE:

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ROUTINES
/TYPEOUT HEAD, PMODE

HES A AUTOID AUTDIZ .+3 PRINT
I

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REDO PRINT REGB HERE KO24D PRINT

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0 91

LHODE PMODE Kflflfl. EJECT

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ACUM
CONT
CHKB LOCN

/LINC /BANK

/END

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/

/HESAGE K215. K212.
/

EJECT

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TYPEOUT
HEADER
AL OW

COUNTER MAINLINE
COUNTER PAS
TO

CHARACTER

PMO E
TO

/RETURN

/BACK

FE D
LINE

IPRINT lwAIT

ROUTINE

AND

K215 PRINT K212 PRINT

RETURN

CARIAGE
/

RETURN PAS TYPE CR-LF AUTOIG
/SAVE /GET /GO /GO [CLEAR /RETURN

CHARACTER

PDP TAD JMS TAO JMS LINC JMP

/TYPE LHODE CRLF, PMO E
/

.-1

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PRINT

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/

MODEL

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/

AUTOS

SET LDA JMP JMP SET OBOE JMP
fl

/PAS LMODE DUMP.
/

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