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MAINDEC-08-DHKMA-A-D

December 2000

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Document:	maindec-08-dhkma-a-d
Order Number:	MAINDEC-08-DHKMA-A-D
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Pages:	40
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OCR Text

IDENTIFICATION
PRODUCT CODE:

^mINDEC'-^ S-DHKMA-A-D

PRODUCT NAME:

PDP-8E EXTENDED MEMORY DATA
CHECKERBOARD TEST

DATE CREATED:

3.0 APRIL 1972

MAINTAINER:

DIAGNOSTIC GROUP

AUTHOR:

VERNON FREY

NOTE:

REPLACES MAINDEC-SE-DIBC-D

. ABSTRACT
The PDP-8E Extended Memory Data & Checkerboard Test i s designed
t o d e t e c t memory f a i l u r e due t o s e n s e - l i n e n o i s e under w o r s t case
c o n d i t i o n s . The f o u r w o r s t case p a t t e r n s p r o v i d e d w i l l generate w o r s t case n o i s e c o n d i t i o n s i n a l l s t a n d a r d and s p e c i a l l y
purchased PDP-8E c o r e s t a c k s , and w i l l t e s t systems equipped
w i t h from 8K t o 32K words o f c o r e memory. The A l l 0*s and
A l l I ' s p a t t e r n s a r e p r o v i d e d t o i d e n t i f y b a s i c memory f a i l u r e s . A u t o m a t i c program r e l o c a t i o n i s p r o v i d e d i n o r d e r t o
t e s t a l l memory f i e l d s from each memory f i e l d .
Teletype
p r i n t o u t s a r e p r o v i d e d f o r e r r o r i d e n t i f i c a t i o n , and t h e
o p e r a t o r i s g i v e n a degree o f c o n t r o l over t h e program by
various switch r e g i s t e r settings.

REQUIREMENTS

2.1

Equipment
A PDP-8E Computer equipped w i t h a t l e a s t 8K o f c o r e memory.

2.2

Storage
The program o c c u p i e s c o r e l o c a t i o n s 0000 t o 4777 and S000
to 7177 o f t h e p r e s e n t f i e l d .

2.3

Preliminary

Programs

The B i n a r y Loader must be i n memory. A l s o , a l l d i a g n o s t i c s
f o r a b a s i c 4K PDP'-SE must have been p r e v i o u s l y r u n successfully.
3.

LOADING PROCEDURE
Load t h e program w i t h t h e B i n a r y Loader CBIN).
may be loaded i n t o any f i e l d .

The program

OPERATING PROCEDURE
To s t a r t t h e program:
Set t h e SR t o t h e I F and DF o f t h e f i e l d t h a t c o n t a i n s
the program.
B.

Press k e y EXTD ADDR LOAD.

Set t h e SR e q u a l t o 0200.

Press keys ADDR LOAD, CLEAR, and CONT.
message w i l l be p r i n t e d .

A setup SR

Set t h e SR f o r d e s i r e d o p e r a t i o n a c c o r d i n g t o t h e f o l l o w i n g
table.
SWITCH

0 (down)

SRj?^
SRJ3fl
SR02
SR^3
SR^4
SRJ2f5
SR0e^0B
SRgf9-ll
F.
1.1

1 (up)

continue a f t e r e r r o r
halt after error
typeout e r r o r s
i n h i b i t e r r o r typeouts
normal
TTY b e l l on e r r o r
r e l o c a t e program
i n h i b i t program r e l o c a t i o n
normal
change f i e l d l i m i t s
normal
h a l t after current t e s t
s t a r t i n g f i e l d l i m i t (JJ-7)
ending f i e l d l i m i t
(^f-7)

Press key CONT.

D e t a i l e d SR
SR00-02
SR^3
SR0A
SRj2f5
SRj36-j2f8
SRj2f9-ll

Explanation

SR02, i f s e t , w i l l r i n g t h e TTY b e l l once f o r each
e r r o r . SR00 and SR01 have no e f f e c t w i t h SR02 s e t .
SR^3 may be s e t o r r e s e t a t any t i m e and t h e program
w i l l act accordingly.
SR04 a l l o w s t h e o p e r a t o r t o change t h e f i e l d l i m i t s
as d e f i n e d by SR06-11.
SR05 i s normal h a l t f o r program.
These s w i t c h e s d e f i n e t h e s t a r t i n g f i e l d l i m i t
y 0\.
These s w i t c h e s d e f i n e t h e ending f i e l d l i m i t
(normally 7 ) .

Example o f s e l e c t i n g f i e l d s f o r t e s t
Example 1:

SR = 0001, 28K system
F i e l d s s e l e c t e d f o r t e s t i n g a r e 6, 5, 4, 3, 2, 1 , j

Example 2;

SR = 0004, 28K System
F i e l d s s e l e c t e d f o r t e s t i n g a r e 4, 3, 2, 1 , 0.

Example 3;

SR = 0022, 28K System
F i e l d s s e l e c t e d f o r t e s t i n g a r e 2 (no r e l o c a t i o n
w i l l occur).

Example 4:

SR = 0041, 28K System
F i e l d s s e l e c t e d f o r t e s t i n g a r e 6, 5, 4, 1 , 0.

Note 1 :

F i e l d s n o t i n t h e system a r e a u t o m a t i c a l l y des e l e c t e d as i n Example 1. F i e l d 7 i s n o t p r e s e n t ,
therefore, not selected.

Note 2:

Do n o t s e l e c t a f i e l d t h a t c o n t a i n s

ROM.

Note

A s i n g l e f i e l d can be s e l e c t e d f o r t e s t i n g p r o v i d i n g t h e program i s n o t i n t h a t f i e l d as i n
Example 3.

Note 4:

Any f i e l d o r group o f f i e l d s can be by-passed as
i n Example 4. F i e l d s 2 and 3 are n o t s e l e c t e d .
F i e l d 7 i s not present.

ERRORS
A T e s t E r r o r w i l l occur anytime t h e data w r i t t e n does n o t
match the d a t a read. A R e l o c a t i o n E r r o r w i l l occur i f t h e
r e l o c a t i o n comparison check f a i l s .
Test E r r o r

Typeouts

For t h e f i r s t e r r o r encountered a header w i l l be t y p e d o u t
f o l l o w e d b y t h e p e r t i n e n t data. For a l l sxibsequent e r r o r s ,
o n l y the p e r t i n e n t d a t a w i l l be t y p e d . The f o r m a t i s as
follows:
PR.LOC.. FAIL. ADR..GOOD..BAD..PATTERN
PR LOC - t h e program address where t h e e r r o r JMS o c c u r r e d .
(Include s F i e l d ) .
FAIL ADR = t h e address o f t h e l o c a t i o n i n e r r o r . ( I n cludes F i e l d ) .
GOOD =

t h e d a t a t h a t was w r i t t e n .

BAD

the d a t a t h a t was r e a d .

PATTERN= t h e p r e s e n t t e s t p a t t e r n and t h e number o f times
i t was complemented.
NC (Not Complemented).
IC (One Complement).
2C (Two Complements).
Relocation Error
All

Typeouts

r e l o c a t i o n e r r o r s are i n t h e f o l l o w i n g f o r m a t :
XXXXX RELOCATION ERROR AT LOCATION YYYYY
XXXXX

t h e program address where t h e e r r o r JMS o c c u r r e d .
(Includes F i e l d ) .

YYYYY = the address o f t h e l o c a t i o n i n e r r o r .
Field).
Note;

(Includes

A f t e r each e r r o r p r i n t - o u t the program c o n t i n u e s
on w i t h t h e n e x t s e q u e n t i a l memory l o c a t i o n .

5.3

P a r i t y E r r o r Typeouts
I f t h e 8E System c o n t a i n s a P a r i t y O p t i o n t h e i n t e r r u p t w i l l
be t u r n e d on t o a l l o w P a r i t y e r r o r s when t h e program i s exec u t i n g from F i e l d 0. The f o l l o w i n g 3 t y p e o u t s can occur w i t h
a P a r i t y Option:
A.

P a r i t y E r r o r , LOG ^-XXXX

I n t e r r u p t from Keyboard

Unwanted I n t e r r u p t

TSTAD;=XXXXX

(present P a t t e r n )

Occurred

P^ESTRICTIONS
6.1

Starting

Restrictions

The program may be r e s t a r t e d a t any t i m e f r o m l o c a t i o n
o r 0202 o f t h e f i e l d t h e program i s p r e s e n t l y i n .
6.2

Operating

0200

Restrictions

The p a r i t y e r r o r t y p e o u t c a n n o t be i n h i b i t e d .

EXECUTION TIME
The t i m e t o w r i t e and read a l l s i x p a t t e r n s i n
one f i e l d i s a p p r o x i m a t e l y $ seconds.
During program e x e c u t i o n a 5 w i l l be t y p e d on t h e TTY a p p r o x i m a t e l y e v e r y 5 minutes o f program r u n t i m e . This a l l o w s t h e
o p e r a t o r t o determine approximate r u n t i m e b e f o r e a f a i l u r e
occurred.

SCOPE LOOPS

8.1

Scope Loop 1
This scope l o o p does a r e a d , complement, w r i t e on t h e address
s p e c i f i e d by t h e SR. The address b e i n g looped on can be
changed s i m p l y by changing t h e s w i t c h s e t t i n g . The p r e v i o u s
address w i l l be l e f t w i t h i t s o r i g i n a l c o n t e n t .
A.

Set t h e SR t o t h e INSTRUCTION FIELD t h a t t h e program i s
i n and t h e DATA FIELD wanted t o t e s t .

Press key EXTD ADDR LOAD.

Set t h e SR equal t o 6000.

Press k e y ADDR LOAD.

Set t h e SR e q u a l t o t h e address t o t e s t .

Press keys CLEAR, and CONT.

8.2

Scope Loop 2
T h i s scope l o o p does ai r e a d , complement, w r i t e on t h e two
addresses i n p u t v i a t h e SR. To change t h e addresses, t h e
Loop must be r e s t a r t e d .
A. Set t h e SR t o t h e INSTRUCTION FIELD t h a t t h e program i s
i n and t h e DATA FIELD wanted t o t e s t .

8.3

Press key EXTD ADDR LOAD.

Set t h e SR equal t o 6200.

Press keys ADDR LOAD, CLEAR, and CONT.

Follow d i r e c t i o n s t h a t are typed o u t .

Scope Loop 3
This scope l o o p does a r e a d , complement, w r i t e on t h e group
o f addresses i n p u t v i a t h e SR. The s t a r t i n g address s p e c i f i e d must be l e s s t h a n t h e ending address s p e c i f i e d .

8.4

Set t h e SR t o t h e INSTRUCTION FIELD t h a t t h e program i s
i n and t h e DATA FIELD wanted t o t e s t .

Press key EXTD ADDR LOAD.

Set t h e SR equal t o 6400.

Press keys ADDR LOAD, CLEAR, and CONT.

Follow d i r e c t i o n s t h a t are typed out.

Scope Loop 4
T h i s scope l o o p does a read, complement, w r i t e on t h e address
i n p u t v i a t h e SR u s i n g t h e d a t a s p e c i f i e d b y t h e SR. The
d a t a can be changed s i m p l y b y changing t h e s w i t c h s e t t i n g .
A.

Set t h e SR t o t h e INSTRUCTION FIELD t h a t t h e program i s
i n and t h e DATA FIELD wanted t o t e s t .

Press key EXTD ADDR LOAD.

Set t h e SR equal t o 6600.

Press keys ADDR LOAD, CLEAR, and CONT.

A message w i l l be t y p e d o u t t o s e t t h e SR t ot h e
address.

selected

8.5

Set SR t o t h e s e l e c t e d address and depress CONT.

Set SR t o s e l e c t e d d a t a (Scope Loop i s c y c l i n g ) .

Scope Loop 5
This scope l o o p does a r e a d , complement, w r i t e on t h e group
o f addresses i n p u t v i a t h e SR u s i n g t h e d a t a s p e c i f i e d by t h e
SR. The s t a r t i n g address s p e c i f i e d must be l e s s t h a n t h e endi n g address s p e c i f i e d .
A.

Set t h e SR t o t h e INSTRUCTION FIELD t h a t t h e program i s i n
and t h e DATA FIELD wanted t o t e s t .

Press key EXTD ADDR LOAD.

Set t h e SR equal t o 7000.

Press keys ADDR LOAD, CLEAR, and CONT.

F o l l o w t h e t y p e d o u t message t h a t i n p u t s t h e address
selections.

Set SR t o s e l e c t e d Data

(Scope Loop i s c y c l i n g ) .

Note 1 : The addresses) s p e c i f i e d w i l l be looped u n t i l stopped
by t h e o p e r a t o r w i t h key HALT. No e r r o r c h e c k i n g i s done. To
resume normal o p e r a t i o n , r e s t a r t program a t address 0200 o r
0202 o f t h e c u r r e n t i n s t r u c t i o n f i e l d .
9.

PROGRAM DESCRIPTION

9.1

Test P a t t e r n s
The

f o l l o w i n g t e s t p a t t e r n s a r e employed by t h e program:

Basic A l l 0's p a t t e r n .

Basic A l l I ' s p a t t e r n .

0000-7117

w o r s t case checkerboard p a t t e r n .

llll-^0000

w o r s t case checkerboard p a t t e r n .

2525-5252 w o r s t case checkerboard p a t t e r n .

5252-2525 w o r s t case checkerboard p a t t e r n .

„,

9.2

Program RelGGation
Program r e l o c a t i o n i s governed by t h e s t a t u s o f SR b i t 3 o r
by t h e f a c t t h a t o n l y one f i e l d i s s e l e c t e d f o r t e s t i n g .
V?ith SR b i t 3 down (pf p o s i t i o n ) program r e l o c a t i o n occurs
each t i m e t h e t e s t p a t t e r n and i t s complement have been
c o m p l e t e l y t e s t e d i n each s e l e c t e d f i e l d .
The program f i r s t
r e l o c a t e s t o t h e h i g h e s t o r d e r 4K f i e l d under t e s t . The
program keeps r e l o c a t i n g t o t h e n e x t lower f i e l d under t e s t
u n t i l i t reaches t h e l o w e s t o r d e r f i e l d under t e s t . The
t e s t i n g and r e l o c a t i o n c y c l e i s t h e n r e p e a t e d . The c o n t e n t s
of t h e e n t i r e f i e l d a r e r e l o c a t e d w h i c h enables any o t h e r
i n f o r m a t i o n (RIM-BIN) t o be c a r r i e d w i t h t h e program.
The program p r o v i d e s a degree o f p r o t e c t i o n f o r i t s e l f by
remembering a l l f i e l d s where e r r o r s occur. When a f u a l t y
f i e l d i s n e x t i n sequence t o c o n t a i n t h e program, t h e program
w i l l s k i p t h e f a u l t y f i e l d and r e l o c a t e t o t h e f i r s t lower
order f i e l d which i s e r r o r f r e e . I f a l l other selected
f i e l d s a r e f a u l t y , program r e l o c a t i o n w i l l n o t t a k e p l a c e .
D u r i n g r e l o c a t i o n a comparison check i s made t o i n s u r e no
program l o s s .

9.3

Test Procedure
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.

W r i t e t h e p a t t e r n i n a l l s e l e c t e d f i e l d s (each l o c a t i o n i s
t h e n t r e a t e d as f o l l o w s ) :
Read-Write t h e l o c a t i o n 11 t i m e s .
Read-Write-Test t h e l o c a t i o n (NC).
Read-Write t h e l o c a t i o n 11 t i m e s .
Read-Complement-Write t h e l o c a t i o n .
Read-Write t h e l o c a t i o n 11 t i m e s .
Read-Write-Test t h e l o c a t i o n ( I C ) .
Read-Write t h e l o c a t i o n 11 t i m e s .
Read-Complement-Write t h e l o c a t i o n .
Read-Write t h e l o c a t i o n 11 t i m e s .
Read-Write-Test t h e l o c a t i o n (2C).
Go on t o n e x t l o c a t i o n r e p e a t i n g B-K.
Go on t o n e x t p a t t e r n r e p e a t i n g A-L when a l l l o c a t i o n s
o f a l l s e l e c t e d f i e l d s a r e completed.

For f u r t h e r u n d e r s t a n d i n g o f how t h e t e s t i s p e r f o r m e d ,
refer t o the l i s t i n g .

The w o r s t case checkerboard p a t t e r n c o n s i s t s o f a l t e r n a t i n g
4 memory cores c o n t a i n i n g 0000 and 4 memory cores c o n t a i n i n g
1111 on a memory p l a n e . This p a t t e r n i s r e v e r s e d every 400
octal locations.
(This t e s t p a t t e r n i s generated a c c o r d i n g
t o t h e s t r i n g i n g o f t h e s t a c k and t h e w i r i n g o f t h e memory
system. I t i s t h e same p a t t e r n f o r a l l 8E s t a c k s ) .
y LINES (MA6L THRU MAUL)
ADDRESS
BIT 9 HIGH

Address
01
B i t 3 High 02

— EJ4l

00 01 02 03 04 05 06 01

10 11

1 1 1 1
1 1 1
1 1 1
1 1 1

1
1
1
1

Address
05
B i t 3 Low 06
01

1^
11

ADDRESS
BIT 9 LOW
0 0 ) 2 ( 0
1
1
1
1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1

76 77

1
1
1
1

1 1 1 1
1 1 1 1

16
11

176
177

EMA2L used i f an 8K memory

The above r e p r e s e n t s one memory p l a n e .

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