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MAINDEC-12-D1EA-D

September 1969

10 pages

Original

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Document:	Float 1s and 0s Through Memory
Order Number:	MAINDEC-12-D1EA-D
Revision:	000
Pages:	10
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-12-d1e/maindec-12-d1ea-d.pdf

OCR Text

IDENTIFICATION
Product Code

MAINDSC - 1 2 -DlLKA-D

Product Names

FLOAT 1»S & 0*S THROUGH MEMORY

Date Created!

September 23, 1969

Maintainer:

Diagnostic Group

Authors

James Kelly

ABSTRACT

This memory exerciser floats a word with a single bit set
followed by a word with a single bit cleared thru each
memory address.
In bank 0 all memory locations not reserved
from address 0240 to 7777 are
for the program itself i.e.
tested.
In extended memory all addresses 0000 to 7777
inclusive are tested.
In general the algorithm for testing
Set the accumulator to 4000% rotate the
is as follows:
number right 4096 times. At the conclusion, test to see if
the accumulator is 4000* This test ascertains that each core
and that
in all tested locations can store a one,
relatively rapid access to each memory location does not
disturb its contents.
,

The second major test is to set the accumulator 3777 I»E.
all but one bit set to ones, and then rotating this number thru
each memory location 4096 times prior to testing - any detected
errors will be indicated by either a message type out or
an error halt*
2.

MACHINE REQUIREMENTS
b.
c.

A standard PDP-5, 8 8/S, 81, 8L, 12 or Linc-8.
An ASR-33 teletype or equivalent.
.If the PDP-5 being tested has extended memory, the GIF
and CDF instructions must be compatible with the PDP-8.

2 e 2

Preliminary Programs

All basic instruction and memory diagnostics must have been
successful ly run prior to attempting to run ( FLOAT 1 s & 0*s TEST)
1

LOADING PROCEDURES
3

Method

If you
This program must be loaded with the binary loader.
are unfamiliar with the proper binary loading procedures,
refer to the User Handbook for your computer, or appendix
" A V of this write up c
a.

c.
d.
e.
f.

g.
h.
i.
j 0

Set the teletype reader switch to FREE.
Open the teletype reader and insert the program tape so
that the arrows on the tape are visible to, and pointing
toward the operator.
Close the reader and set the reader switch to START.
Set' the teletype from pane 1 switch to ON-LINE.
Set the LEFT switches to 7777.
Set the RIGHT switches to 4000.
Set the MODE switch to 8 mode
Depress I/O preset.
Depress START LS e
When the program tape has been read in, the computer will* ha it
The ACCUMULATOR must be equal to 0000 if it is not an error
has occurred and one might try reloading the binary loader.
j

ST ART INGPROC SDUR E
a.
fo*

c.
d.
e.
r.

1« I

Remove the paper tape from the teletype reader.
Set the three right most switches SR9, 10, 11 to
the number of the memory bank you wish to test.
In a basic machine with no extended memory, this would
be 000
Set the MODE switch to 8 mode,
Depress I/O preset,
Depress ST APT 20.
The program, when properly running, will cause the
AC to flicker, and' the Kh to count up* one pass will
take approximately 10 min.
§ w i t c h Settings

In general, switches 0,1,2 allow the test engineer to
select the made of error indication, I.E., type out or
error halt. The normal mode with switches 0, l, 2 on a
zero is an error halt. To modify these circumstances procede
as follows

SR00 =
SR01 =
SR02 =

1
I

Suppress halt
Suppress typing
Scope Loop on error

These designated switches have an order of precedence
associated wxtn them* which is designed for maximum flexibility,,
^

In the event of an error, the first switch to be tested is
switch 0; if it is 0 the computer will halt at address 0053,
Depress continue to check switch 1 and obtain printout.
If it is a 1, 1 ,11*
suppress halt, we test switch 1.
If
switch 1 is 0 the following typical' error message will ensues
FLOAT
I/O
ADDR
DATA
0241
6000
^

This message is Interpreted as follows
1)

The ••ADDR" heiress of the memory location .under test*
indicates which memory address was being tested when
the failure was detected
^

"DATA" indicate the data in this memory location
the correct data for the Float 1 test is 4000 the
correct data for Float 0 test is 3777,

APPENDIX A
PDP-8 MODE PERFORATED-TAPE LOADER

READIN MODE LOADER

The read in mode (RIM) loader is a minimum length, basic
perforated -tape program for the 33 ASR,
It is initiallystored in memory by manual use of the operator console
keys and switches . The loader is permanently stored in
18 locations of page 37.
9

The RIM loader can only be used in con juct ion with the
33ASR reader (not the high-speed pe r f o rated -t ape 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 3 3 ASR,
(NOTE:
Some PDP-12 diagnostic program tapes are in RIM
format)
,

The complete PDP-12 RIM loader (SA«7756 is as follows;

Absolute
Address

Octal
Content

Tag

Instruction

7756
7757
7760
7761,
7762,
7763,
7764,
7765,
7766,

6032
6031
5357
6036
7106
7006
7510
5357
7006

BEG,

KCC
KSF
JMP-1
KRB
CLL RTL
RTL
SPA
JMP BEG+1
RTL

7767,
7770,
7771,
7772,
7773,
7774,
7775,
7776,
7777,

6031
5367
6034
7420
3776
3376
5356

Comments

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

/CHANNEL 8 IN ACO
/CHECKING FOR LEADER
/FOUND LEADER
/OK, CHANNEL. 7 IN

LINK

5XXX

KSF
JMP-1
KRS
SNL

OCA 1 TEMP
DC A TEMP
JMP BEG
TEMP,

JMP X

/READ, DO NOT CLEAR
/CHECKING FOR ADDRESS
/STORE CONTENT
/STORE ADDRESS
/NEXT WORD
/TEMP STORAGE
/JMP START OF BIN
LOADER

by way of the operator
Piarina the RIM loader in core memory
as follows,
accomplished
is
switches
consul Keys

^^S^hes.
m

set the starting address 7756 in
the Kium
Set the first instruction (6032)
switch.
FILL
the
Press
tne RIGHT switches,
Set the next instruction (6031)
p-r^oo the FILL STEP switch,,
nave
Seat steS d and e until all 16 instructxons
V.
been deposited*
place th?.^Pj in |he reader,
To lead a tape in RIM format, starting ^dress 7756 of
set the LEFT switches to the
being read), press c
RIM loader (not of the program reader.
LS key, and start the Teletype
a.
b#
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