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MAINDEC-12-D1EA-D

2000

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Document:	Float 1s and 0s Through Memory
Order Number:	MAINDEC-12-D1EA-D
Revision:	0
Pages:	10
Original Filename:	http://bitsavers.org/pdf/dec/pdp12/diagnostics/MAINDEC-12-D1EA-D_Float_1s_and_0s_Through_Memory.pdf

OCR Text

IDENTIFICATION

MEMOATA

Product Code:

MAINDEC-12-DIEA-D

Product Name:

FLOAT 1 1 S & ~ 1 S THROUGH MEMORt

Date Created:

September 23, 1969

Maintainer:

Diagnostic Group

Author:

James Kelly

l •

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
for the program itself i.e., from address 0240 to 7777 are
tested.
In extended memory all addresses 0000 to 7777
inclusive are tested.
In general the algorithm for testing
is as follows:
Set the accumulator to 4000:rotate the
number right 4096 times. At the conclusion, test to see if
the accumulator is 4000.This test ascertains that each core
in all tested locations can store a one,
and that
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.

MACHINE REQUIREMENTS
a.
b.
c.

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

2.2 Preliminary Programs
All basic instruction and memory diagnostics must have been
successfully run prior to attempting to run (FLOAT l's & fi5•s TEST}
3.

PROCEDURES

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

c.
d.
e.
f.
q.
h,
i,
j.
k.

Set the teletype reader switch to FREE.
Open the teletype reader and nsert the program tape so
that the arrows on the tape arP. visible to, and pointing
toward the operator.
Close the reader and set the reader switch to START.
Set the teletype from panel switch to ON-LINE.
Set the LEFT switches to 7777.
Set the RIGHI' switches to 4000.
Set the MODE switch to A mode.
Depress r/o preset.
Dr~prC>ss S'I'ART LS.
\~'hr'n the proqram tape has becm read in, the computer will' halt.
Thf~ ACCUMlJLATOH must be equal to 00001 if it is not, an error
has occurred and one might try reloading the binary loader.

a,
b,

Remove thrc: 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 ~ODE switch to R mode,
Depress
preset,

c,
0,
0er

Dr~press

The proqram, whr:~n properly running, will cause the
flicker, and· the Ml\ to count up. one pass will
1¢ mino

S'T'ART 20:.

n <wneral, switches 0
1, 2 allow the te3t enqineer to
select the mo.Je of error indication, I.E.,type out or
error halt.
The normal mode with switches O, 1, 2 on a
zero is an error halt. To mod
these circumstances precede
as follows:

::;RQO

Sl".01 ""

SR02

halt
,,.:;cope Loop on error

ThE:.se dr,;
tches hav'' an order of precedence
associ<Ec)d wit,-1 them, which ::.
for maximum flexibility.

In the event or an error,
switch O; if i t is 0 the

irs~

switch to be tested is
will halt at address 0063.

Depress cont.int'e to checi<
l ar:d obtain printout~
If it is a l,
•p
suppress halt, we test switch 1.
If
switch 1 is 0 the fol
"typical" error message will ensue~
FLC'iAT
ADDR

.CJ;!{f'

y!'241

This message i

interpreted as follows:

The Ji,..DDHn
ress of the me1nor~1 location ,unde~ t.est ~
Indicates
ic11 mc~mory address was being tested v1I'1en.
the failure was detected.

"DATA" indicate the data in this memory :Location
the correct data for the Float l test is
the
correct data for Float ~ test is 3777.

APPE;-.:DIX
PDP-fl MODE PERFORATED-TAPE LOADER

READIN MODE LOADER

The readin mode (RIM) loader is a minimum length, basic,
perforated-tape program for the 33 ASR.
It is initially
stored in memory by manual use of the operator console
keys and switches. The loader is permanently stored in
18 locations of page 37.
The RIM loader can only be used in conjuction with the
33ASR reader (not the high-speed
reader).
Because a tape in RIM format is,
effect,
as long
as it need be, it is suggested that the RIM loader be used.;
only to read the binary loader when us
the 33 ASR.
(NOTE:
Some PDP-12
ic program tapes are in RIM
format).
The complete PDP-12 RIM loader (SA=7756 is as follows:
Absolute

Octal

Tag

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

6032
6031
5357
6036
7106
7006
7510
5357
7006

BEG,

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

6031
5367
6034
7420
3776
3376
5356
0
5XXX

Instruction I Z

Comments

KCC

AC AND FLAG

KSF
JMP-1

IF FLAG"'l
FOR CHARACT
BUFFER

KRB

CLL RTL
8 IN ACO

RTL

SPA
JMP BEG+l

FOR LEADER

LEADER
CHANNEL 7 IN

RTL

LINK
KSF
JMP-1
KRS
SNL

TEMP

FOR ADDRES~
CONTENT

ADDRESS

TEMP

BEG
TEMP

WORD

STORAGE
START OF BIN
LOADER

Pl.acing the HD1 l.oacl<•r in con~ memory by way of tho operator
console keys ans switches is accomplished as follows1
a.
b.
Co

d.
e.
f.

Set the starting address 7756 in the LEFT switches.
Set the first instruction (6032) in the RIGHI' swtiches.
Press the FILL switch.
Set the next instruction (6031) in the RIGHI' switches.
Press the FILL STEP switch.
Repeat steps d and e until all 16 instructions have
been deposited.

'ro lead a tape in RIM format, place the tape in the rea.der,
set the LEFT switches to the starting address 7756 of the
RIM loader (not of the program being read), press the STAR:r
LS key, and start the Teletype reader.

sam

l}/u,11d~c.~

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0051
0052
0053
0054
0055
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0(15 7

0060
0061
0062

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CLL CLA

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5~?.i;J

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TAlL. Y

/STORE

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/F'E;TCH IT

/SET L=l
I~

f/J,~~717

EST ADOqESS

4896 TIMES

/DO~E

JMP

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Goor:

/TEST FAILED TELL
/!J;;liJA iE: ADi!RESS
/TEST NE~ ~DDRFSS

CMA

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en.
Gr:J ,.,y 2: T

7042
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5063
2005
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30:12

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i :;.; 4

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0143
0144
0145
0146
0147
0150
0151
lil:l.52
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4152

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0154

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5527

TYPE

JMP I

OCTYP

Tl.S
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TYPE
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0156

7 3kJ

0157
lili60

5552

lil1. 6
0162

!{;2 2
03 6

0163

03 4

Z314

~J317

0317
i3C'1

0215

K2
K2 21

0215
0212
k'.'3 6

03(11
~324

l324
'1240

0171

0240
026;!.
0257

0172

'7:260

0260
¥)2 :l. 5
e212
l321
lll3iC4

0173
0174
2l1. 75
0176
0j, 77

020:21
0201

0202
0203
0204

0205
0206
0207
fll2H'J

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REG8

le 4
TYPE,

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6046

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5154

0170

f\'!J

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0155

0164
0165
0H6
0:16 7

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/00

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DATA
150?

0261

0257

0215
~1 212

0301
0304
0304
0322
0240
e:.304

0304
2322
0240
ia304

03:;31
0324
03ll1
1!1215

0301
0324
0301
0215
02;l.2

0212

0:2100

(90~;;

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