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MAINDEC-08-D1A

December 1968

8 pages

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Document:	maindec-08-d1aa-d
Order Number:	MAINDEC-08-D1A
Revision:
Pages:	8
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d1a/maindec-08-d1ac-d.pdf

OCR Text

IDENTIFICATION
PRODUCT CODE:

PRODUCT NAME:

MAINDEC—08wDTAC—D

PDP-8 Memory Power On/OFF Tes’r
V

DATE CREATED:

September 16, 1968

MAINTAINER:

Diagnostic Group

AUTHOR:

M. Horovi’rz
.

PREVIOUS CODE:

MAINDEC 829

DOM
“MARY

ABSTRACT

This program is a Memory Data

Validity Test tobe used after

simulated power failure

REQUIREMENTS

S tora ge

Memory loCations GOD‘S-"74778
Subprogram and/or Subroutines
’

RIM

Binary Loader

Equipment
PDP— 8 Processor,

keyboard reader, and Teleprinter

USAGE

3 .l

Normal binary tape loading procedures are to be usedwith this program

Start up and/or Entry

3 .2
_

Load address 0014 and press START.

The program should then halt at 0042

Load address 000] and press START.

The program should now loop.
3.3

ErrorsIn

Usage

Errors detected by the program cause the program to halt at memory address 0055. The
contents of memory addresses OOl
l8 and 00128 indicate the addresses of the data that failed to check-“sum

Memory addresses 00078 and 00l08 contain the data words that failed to checkwsum.
Lower Address

(00118)

(00128): 37008 «74778

Lower Error Word

Upper Error Word

(00078)
(00108)

Upper Address

3 .4

1008 ”36778

25258
52528

‘Error Recovery
Press CONTlNUE to test For other error words in memory.
Reload address 00208 to restart the entire program

DESCRlPTlON

4~l

Discussion

This program tests memory tor hit drop out and pick up otter a simulated power iailare has
occurred

By starting the program at memory address 00M

data words consisting at 25258 are written

and the data words consisting at 52528 are written into memory low-

into memory locations

Ol008~—36778,
37008-m74778 after which the program halts atmemory address @0428. Load address 00m and rem
start the program; the program will 2‘s add the contents at memory location
Ol008 with 37008, it the
cations

result equals 77778, the program will 2's add the contents of memory locations OlOlg with 370%, etc,

until the memory addresses of 36778 and 74778 are tested
The program stays in the 2‘s add compare loopuntil an error occurs. Concurrently cycle the power to the FDR-8 off and on, After the power has been
.

reapplied to the PUP-'8, load address OOOlg and press START. it an error occurred during the power cycling,
the program halts at location 00568. The program may be restarted at memory address 00mg as many times
‘

desired. Restart address to till memory is

462

Examples and/or

00208 not 00M;

Applications

A HALT occurs at memory

Address

00078

.Address

OOlO8

Address

OOl l8

Address

00128

address 00558.

EXECUTlON TIME
l

msec/loop'

25058

(Data Word)

5252

(Data Word)

OlOl

(Address Word)

370i

(Address Word)

Bit 7 was dropped at memory address

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