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MAINDEC-08-D05

December 1967

24 pages

Original

0.8MB

Document:	maindec-08-d05b-d
Order Number:	MAINDEC-08-D05
Revision:
Pages:	24
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d05/maindec-08-d05b-d.pdf

OCR Text

MAIN DEC-08—DO5B—D

IDENTIFICATION
'

Product Code:

MAINDEC-OB-DO5B—D

Product Name:

Random JMP-JMS Test

Date Created:

December 28, I967

Maintainer:

Diagnostic Group

Author:

Green

MAIN DEC—OS—DOSB-D
l

ABSTRACT

This is a diagnostic program to test the JMS instruction of the PDP-8.
TO addresses are selected for each test.
to

Random FROM and.

The JMP instruction is tested in that each. test requires a JMP

reach the-JMS.

REQUIREMENTS
'

Equipment

2.1

PDP—8 equipped with Teletype

.2. 2

Sta

rag e
t

Locations 0000

0574

The Binary Loader must be stored in the last memory page.

Preliminary Programs

2 .3

It is assumed that MAINDEC 08-D0l (n), 08-D02(n),
.

run

successfully

LOADING PROCEDURE

3.1

Method

_Use the standard Binary Loader
4.

STARTING PROCEDURE

4.]

Control Switch Settings
SRO

Halt on error.

SR2

Hold the {FROM address Constant (1).
Select random FROM addresses (0).

SR3

Hold the TO address constant (T )

Select random TO addresses (0).

4.2

Starting Address
0200
Restart Address -_ 0215

08-D03(n), and 081-D004(n) have been

MAINDEC—OB-DO5B—D

4 .3

Operator Action
a.

Set SR to 0200 and press LOAD ADDRESS.

'If it is desired to set either SR2 or SR3, the FROM or TO address may be specified by

entering the address into the locations shown below.
0

FROM

Location

130

Location l26

If SR2 or SR3 is set after the program has been started, the last address taken from the
..

random number generator is used repeatedly.

Push START.

‘c .

OPERATING PROCEDURE

Same as section 4.

ERRORS

6.l

Error Halts

If the program executes one

All unused memory lo'cations are loaded with HLT instructions.
of these background

HLTs, it is probable that the interrupt Failed to occur following the JMS instruction,

The FROM and TO address may be

6.2

checked

at any time to

locate the test JMS instructions.

Error Printouts

‘

TO wry

F XXXX

(TO)

(nnnn)

6.2.l

mmmm

rrrr

Explanation
(FROM) F xxxx: xxxx
(TO) TO yyyy: yyyy
(TO)

(nnnn)

mmmm;
=

rrrr:

mmmm

nnnn

interrupt.

address of JMS instruction being tested

address that the JMS instruction is going to
=

the contents of the address TO.

This should equal xxxx + l

is the address minus one that was stored in location 0000 during the
rrrr

is the content of address nnnn

MAINDEC-OB-DO5B—D

6.2.2

Examples
a.
.

The following is a forced error printout where no error occurred .'
'

To 6354

5236

(T0)

(6354)

5237

The test JMS instruction was in location 5236.

The JMS was trying to jump to loca-

tion 6354.

The contents of TO-(location 6354) was 5237.

stored on a

JMSinstruction.

To gain any

This is correct since the PC is

knowledge from the third line of the printout, the

sequence of events when a JMS instruction is followed by an

user

interrupt.

must understand‘the

As an end result

of this sequence, the address of the location following the cell where the PC is stored is

placed into cell 0.

Toderive

this‘third line of the printout, the address in cell ‘0 is

decremented by one and printed on the Teletype; then the

printed
b.
/

contents of that address

are

The following is a typical error printout.
F

\MW/

TO 6354

5236

(T0)

7402

(4354)

5237

Line l is simply a statement of the problem.

Line 2 says that the contents of loca-

tion 6354 are not 5237 as they should be, but are 7402 instead '.

7402 is

a HLT instruction

Since memory is filled with a background of HLT orders, lit-is evident- that the PC was not
stored in location 6354 during the JMS.

was

Line 3

of the printout reveals where the PC was stored .3 Since on-the interrupt 4355

stored

in. location zero and (4354) contains the correctly stored PC, 5237,

apparent that aiump error occUrred
but it actually. jumped to 4354.
1c

it is

‘The‘ JMS instruction should have iumped to 6354,

Bit 1

was

lost.

The-following is another typical error printout.
'

(T0)

(6354)
Line

TO 6354

5236

7237
=

72377

l. is again simply

statement of the

problem

Line 2 says that the contents of

location 6354 are not 5237 as expected, but are instead 7237.
not a

HLT order,

was wrong.

7402,

Since the co‘ntents are

it is evident that the PC was stored here, but the number stored

Comparing the good (5237), and’the bad (7237),

it is

"picked up” during the store PC operation of the JMS instruction
3

apparent that bit l was

MAI:NfiDEC—O'B-‘DZOSBT -Di

6' .73:

Error Recovery

The program continues testing following an error printout. When enough information has been

gathered from the error printouts, 0. FROM and TO address. is selected for use in: the scope mode- loop.

chosen addresses into proper location-s (see section 4.3.b)... Enter 5531 into location i and

Enter the

restart the program with SR2 and SR3: set.

The scope mode loop is:
Location

,
.

*
-

.
.

Coding
I

0000-,
J-MP l FROM 1:.

00.01"
I

xxxx
,

ION

JMS, 1» TO;

xxxx:
'

0:131

FROM 1 A
_

To. discontinue the scope- mode. loop, restore the, original contents (7200) of location ] and

restart.

RESTRICTIONS

(None):
8,.

MISCELLANEOUS

Execution Time;

81. l"

4‘, 726 random: tests/second
9

PROGRAM DESCRIPTION

The JMS. instruction is. checked through» use of the interrupt Function
erato-r

A random number gen-

selects: a FROM and" a T0 address- An ION instruction is then placed at FROM --1 and the

JMS instruction- at FROM.

The program i-um..:p:s: to. the: address. specified by TO.

ION and-- JMS instructions,

an:

After

executing the

interrupt occurs starting; the program counter at location 1

routine located; here verifies that the.» operation was successful before

Rand-om addresses are restricted as follows:

A checking

starting‘the next test.

0600' <. randOm address < 76.00.

The area between 0.600“ and. 76010 is filled with H’LT‘ instructions in case the interrUpt fails.
'

”05:” is

printed after every 6} 000 tests...
,

MAINDEC-OB—DO5B—D

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