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MAINDEC-08-D04

December 1967

14 pages

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Document:	maindec-08-d04a-d
Order Number:	MAINDEC-08-D04
Revision:
Pages:	14
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d04/maindec-08-d04a-d.pdf

OCR Text

MAINDEC-08-D04A-D

IDENTIFICATION

Product Code:

MAINDEC-08-D04A-D

Product Name:

Random JMP Test

Date Created:

April

Maintainer:

Diagnostic Group

Author:

R. Green

1,1967

`,\

MAINDEC-08-D04A-D

ABSTRACT

This program test.s the JMP instruction of the PDP-8 .

Most of memory is used as a JUMP
I

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

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.

Prel im inary Prc>grams

It is assumed that MAINDEC 08-DOT(n), 08-D02(n), and 08-D03(n) have run successfully.

LOADING PROCEDURE

3.I

Method
Use st.andard Binary Loader.

STARTING PROCEDURE

4.1

Control Switch Settings

4.2

SR0

Halt on Error.

SR2

Hold JUMP FROM addresses constant. (1)
Select random JUMP FROM addresses. (0)

SR3

Hold JUMP To addresses constant. (1)
Select random JUMP TO addresses. (0)

Starting Address

0200
Restart Address
0214

MAINDEC-08-D04A-D

4.3

Operator Action
a.

Set sR to 0201 and press LOAD ADDRESS.

Set SR to desired mode.

If a particular memory location is desired for[ither a

"constcint FROM" or "constant Toll, this memory ciddress is entered into ore of the
locations shown below:
FROMI

ADDRESS

0116

FROM

ADDRESS

0115

ADDRESS

0114

NOTE:

Always make (FROM 1 ) = (FROM) -1

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

6.1

Error Halts

All unused memory locations are loaded with HLT orders.

If the program executes one of these

background HLTS, it is probable that the interrupt failed t.o occur following the JMP instruction .

6.2

Error printouts

F wwww TO xxxx

Z = yyyy
(FROM) F wwww: wwww = the address of the JMP inst.ruction .

(TO) T xxxx: xxxx = the address that the JMP instruction is iumping to .
(LOC 0000) Z = yyyy: yyyy = the address stored in location 0000 during the in+:rrup+.
No+e that yyyy should equal xxxx.
I

Example:

the following is a typical error printout:

F 4252 TO 7020

z--7OrNf.
Line I of the printout isa s[atementofthe problem.
instruction is placed at location 4252.

trying to iump to location 7020.

AJMP

This JMp instruction is

Line 2 of the printout indicates

,
I

-lJ

MAINDEC-08-D04A-D

the error.

The TO address (7020) was to have been st.ored in

location 0000 but instead a 7000 was stored .

Thus bi+ 7 was

dropped .

6.3

Error Recovery
The program cont.inues testing following an error printout.

When enough information has

been gathered from the error printouts, a FROM and TO address is selected for use in the scope mode
loop.

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

SR2 and SR3 set.

Restart the program with

After allowing it to run for a moment push STOP, ent.er (5516) into location i, and

restart the program at location 0025 with SR2 and SR3 set.
Location

The scope mode loop is

Coding

0000
0001

JMP I FROM 1

xxxx

A, ION

xxxx

JMP I TO

0116

FROM1, A

When it is desired to discont.inue the scope mode loop, restore the original cont.e ts

(1114)

of location 1, and restart the program .

RESTRICTIONS

(None)
8.

MISCELLANEOUS

8.I

Execution Time

7200 random tests/second

PROGRAM DESCRIPTION

The JMP inst.ruction is checked through the use of the interrupt function .

generator selects a FROM and a TO address.
JMP instruction ar FROM.

A randpm number

An ION inst.ruction is then placed at FROM -I and the

The JMP instruction jumps to the address specified by TO.

these two orders, an interrupt occurs starting the program counter at location 1.

Aft

executing

A checkin rout.ine

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

0400 < random address < 7600.

.0400 and 7600 is filled with HLT inst.ruct.ions in case the inferrupl fails.

group of 72,000 tests.

The area between

A ''04" is printed after each

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MAINDEC-08-D04A-D
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