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MAINDEC-08-D1A

December 1965

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Document:	maindec-08-d1aa-d
Order Number:	MAINDEC-08-D1A
Revision:
Pages:	6
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d1a/maindec-08-d1aa-d.pdf

OCR Text

IDENTIFICATION

PRODUCT CODE:

MAINDEC-08-DIAA-D

Pl`ODUCT NAME:

PDP-8 Memory Power (

DATE CREATED:

December 2, 1965

MAINTAINER:

Diagnostic Group

AUTHOR:

R . Green
M. Horovitz

mEvlous CODE:

MAINDEC 829

I.PDP-a
LIBF]AF=Y

MAINDEC-08-DIAA-D

u
ABSTRACT

This program is a Memory Data Validity Test to be used after a simula
2.

d power fai lure .

REQUIREMENTS

Storage

Memory locations 00208--76778
Subprogram and/or Subrourines
High RIM

High Binary Loader
Equipment

PDP-8 Processor, keyboard reader, and Teleprinter
USAGE
Loading

Normal binary tape loading procedures ai.e +o be used with this program .

3.2

St.art up and/or Entry
Load address 0020 and pl.ess START.

The program should then halt at 00438.
Load address 0001 and press START.

The program should now loop between 00448 and 00658 .
3.3

El.rors in Usage

Errors detected by the program cause the program ro halt at memory address 00568.

The

cc]nrent.s of memory addresses 00118 and 00128 indicat.e the addresses of the data t.hall fai led tc> checkmsum .

Memory addresses 00078 and 00108 cont.ain the data words that failed to check-sum .

3.4

LowerAddress

(00118)=

loos

UpperAddress

(00128) = 37008-76778

Lower Error Word =

(00078) = 25258

UpperErrorword

(00108)

-36778

52528

Ei.ror Recovery

Press CONTINUE fo test for other error words in memory.

Reload address 00208 +o restart the en+ire program .

MAINDEC-08-DIAA-D

DESCRIPTION

Discussion

This program tests memory for bit drop out and pick up after a simulated power failure has

occurred .
By starting the program at memory address 00208, data words consisting of 25258 are written

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start the program; the program will 2's add the cont'ents of memol.y location 01008 With 37008. lf the
result equals 77778, the program will 2's add the contents of memory locations 01018 wi+h 37018, etc.

until the memory addresses of 36778 and 76778 are tested . The program stays in the 2's add compare loop
until an error occurs. Concurrently cycle the power to the PDP-8 off and on. After the power has been
reapplied lo the PDP-8, load address 00018 and press START. If an error occurred during the power cycling,
the program halts a+ location 00568 . The program may be restarted at memory address' 00018 as many times
as desired .

Examples and/or Appli cations

4.2

A HALT occurs at memory address 00568 .

Address

00078

25058

(Da+aword)

Address

00108

5252

(Dataword)

Address

00118

0101

(Addressword)

Address

00128

3701

(Addressword)

Bit 7 was dropped at memory address 01018 .

EXECUTION TIME

1 msec/loop

I,6'

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