Digital PDFs

MAINDEC-08-D04

December 1968

18 pages

Original

0.6MB

Document:	maindec-08-d04a-d
Order Number:	MAINDEC-08-D04
Revision:
Pages:	18
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d04/maindec-08-d04b-d.pdf

OCR Text

MAINDEC—OB-DO4B-D

IDENTIFICATION
Product Code:

MAINDEC-O8-DO4B-D

Product Name:

Random JMP Test

Date Created:

March 25, 1968

Maintainer:

Diagnostic Group

MAINDEC-08-DO4B—D

ABSTRACT

This program tests the JMP instruction of the PDP-8

Most of memory is used as a JUMP

field with a random number generator selecting each JUMP FROM and JUMP TO location

REQUIREMENTS
2.1

Equipment
PDP-8 equipped with Teletype

2.2

Storage

0000, 0364.
2.3

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

Preliminary Programs
It is assumed that MAINDEC 08-D01(n),

08-D02(n),0 and 08-D03(n) have run successfully.

LOADING PROCEDURE
I

3.1

Method
Use standard

Binary Loader.

STARTIN G PROCE DU RE

4.1

Control Switch Settings

SRO.

Halt on Error.

SR2

Hold JUMP FROM addresses constant. (1)

Select random JUMP FROM addresses. (0)
SR3

4.2

Hold JUMP TO addresses constant.

Starting Address
0200
Restart Address

021 4

(T)

Select random JUMP TO addresses. (0)

MAIN DEC-08—DO4B-D

4.3

goerator Action
a.

Set SR to 0200 and press LOAD ADDRESS.

Set SR to desired mode

It a particular memory location is desired for either a

”constant FROM" or ”constant TO", this memory address is entered into one of the

locations shown below:
FROM 1

ADDRESS

0116

FROM

ADDRESS

0115

ADDRESS

0114

Always make (FROM l)

NOTE:

(FROM)

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

random number generator is used repeatedly».
c .

Press START

OPERATING PROCEDURE
Same as section 4.

ERRORS

6.l

Error Halts

All unused memory locations are loaded with HLT orders.

background HLTS,

it is probable that the

If the program executes one of these

interrupt failed to occur following the JMP instruction.
R
K?

6.2

Error Printouts
F wWww TO xxxx

YYY)’

(FROM) F wwww: wwww
(TO) T xxxx; xxxx
(LOC 0000) Z

Example:

the address of the JMP instruction

the address that the JMP instruction is iumping to.

yyyy: yyyy

the address stored in location 0000 during the interrupt.
Note that yyyy should equal xxxx.

the following is a typical error printout:
F 4252 TO 7020

7000

Line l of the

printout is a statement of the problem

instruction is placed at location 4252.

trying to jump to location 7020.

A JMP

This JMP instruction is

Line 2 of the

printout indicates

MAINDEC-OB—DO4B—D

the error.

The TO address (7020) was to have been stored in

location 0000 but instead a 7000 was stored

dropped
6 .3

Thus bit 7 was

Error Recovery

The program continues testing following an error printout.
been gathered from the error printouts,

loop.

When enough information has

FROM and TO address is selected for use in the scope mode

Enter the chosen addresses into proper locations (see section 4.3.b).

SR2 and SR3 set.

After

restart the program at

allowing it to

run

Restart the program with

for a moment push STOP, enter (55l6) into location l, and

location 0025 with SR2 and SR3 set.

Location

The scope mode loop is

Coding

0000
000]

JMP I FROM l

A, ION

xxxx

JMP I TO

xxxx
‘

0116

FROM 1, A

When it is desired to discontinue the scope mode loop,
of location l, and restart the program

restore

the original contents (l l l4)

RESTRICTIONS

(None)
8.

MISCELLANEOUS

8.l

Execution Time

7200 random tests/second

PROGRAM DESCRIPTION
The JMP instruction is checked through the use of the interrupt function.

generator selects a FROM and aTO address.
JMP instruction at FROM.

these two orders,

A random number

An ION instruction is then placed at FROM -'l and the

The JMP instruction jumps to the address specified by TO.

interrupt occurs starting the program counter at location 1

After executing

A checking routine

located here verifies that theoperation was successful before starting the next test.
Random addresses are restricted as follows:

0400 and 7600 is filled with HLT instructions. in
2

group of

72,000 tests.

case

0400 < random address < 7600.

the interrupt fails.

The area between

A "04" is printed after each

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