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MAINDEC-08-D1M

December 1971

16 pages

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Document:	maindec-08-d1ma-d
Order Number:	MAINDEC-08-D1M
Revision:
Pages:	16
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d1m/maindec-08-d1ma-d.pdf

OCR Text

IDENTIFICATION
PRODUCT CODE:

MAINDEC-08-DlMA-D

PRODUCT NAME:

MEMORY ADDRESS TEST

DATE CREATED:

FEBRUARY 11, 1971

MAINTAINER:

DIAGNOSTIC GROUP

AUTHOR:

CORPORATION

GREEN/B. HANSEN

ABSTRACT
The Memory Address Test checks for proper memory
address

selection on the PDP-8,
2.

REQUIREMENTS

2.1

Equipment
Standard PDP-8 Computer.

2 ' ^

Storage
The low version occupies locations 0000-0222.

occupies locations 7400-7575, 0-3.

The high version

The binary loader must be

stored in the last memory page.
^ ' ^

^^Q^^^i^^J^y Programs
It is assumed that the only malfunction is in
the memory

addressing circuits.
3.

}.QADING PROCEDURE

The program is supplied in RIM format.
4.

STARTING PROCEDURE

4.1

Control Switch Settings
SRO

4.2

4.3

Halt after error printout.

Starting Addresses
0004

Low Storage

7400

High Storage

Restart

0000

Operator Action
a.

Load the starting address into the program counter.

Set the SWITCH REGISTER to 4000, if halt on error is
desired.

Push START.

OPERATING PROCEDURE
Same as section

ERRORS

Error Printouts

Axxxx

Cyyyy

Axxxx.

(Address), xxxx = Address containing the wrong data

Cyyyy.

(Contents), yyyy = Contents of location xxxx.

t Err or

printout format)

The address should always equal the contents.

Error Recovery

Analysis of several error printouts should establish a

meaningful pattern that will single out a particular
address selector card*
If it is necessary to scope the problem, the following two

instruction loop may be entered into memory by the operator,
TAD [Bad Location]
JMP .-1

MISCELLANEOUS
Execution Time
An 11 is printed after every 96 complete program loops
(every 28 seconds).

Memory Maps
High

Low
0000

0200

Area
Tested

7400

Test Program
I

Loaders

7600

7777

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