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MAINDEC-9A-D0HC-D

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Document:	EAE-2 maindec-9a-d0hc-d
Order Number:	MAINDEC-9A-D0HC-D
Revision:
Pages:	8
Original Filename:	http://bitsavers.org/pdf/dec/pdp9/EAE-2_maindec-9a-d0hc-d.pdf

OCR Text

IDENTIFICATION
Product Code:

MAINDEC-9A-DOHC-D

Product No~:
Date Created:

September 23 1968

Maintainer:

Diagnostic Group

Author:

J. Hittell

ABSTRACT
Part 2 of the PDP-9 EAE Diagnostic veriFies only correct operation of the EAE multiply and

divide in~tructions. Part 2 is written in two sections: Section 1 checks EAE instructions agaif,lst pr,edetermined results. This ranges from setup operation, through multiply and divid~ instructions executed
bock to back; Section 2 is a random-number check of the signed multiply and signed divide instructions.
Hardware malfunctions in Section 1 result in an error halt.

Hardware malfunction~ in Section

2 result in an error. message on the teleprinter.

REQUIREMENTS
Storage
The program when loaded occupies locations 20 to 7100.
Subprograms and/or Subroutines
Teletype Output Package
Signed Multiply Subroutine (modified)
Signed Divide Subroutine (modified)
Equipm:nt
Minimum configuration PDP-9 with EAE option installed

USAGE

3.1

Loading
Hardware read in (HIR) SA=017720

3.2

Calling Sequence
The program is self-starting; after an explanatory printout, press CONTINUE buttpn to

proceed.

3.3

Switch Settings
AC Switches = 0 or Down
With all AC switches down, the program results in the following:
a.

Hardware malfunctions detected in Section 1 result in an error holt.

Hardware malfunctions detected in Section 2 result in an error typeout.

At the completion of the error typeout, the processor halts.

The program completes whichever section of test it wos started in, sequence from

each subt'est of the section to the next, without halting.
AC Switches 1 or Up
SW

3.4

Description

Operation
Delete error typeouts

The program will not type out error
messages, but wi II ri ng be \I on error.

Halt after EAE operation

The processor halts after each EAE operation is initiated and its results are
verified. (Note: Press CONTINUE to
proceed.)

Repeat EAE operation
(Scope Loop)

The program repeats the lost EAE operation.
If SW2 is set during an error typeout or holt,
the program repeots the operation that
caused the error (Note: SW1 is tested' before SW2.)

Halt after EAE sequence

The processor halts after each sequence
of testing an EAE operation.

Repeat EAE sequence

The program repeats the lost sequence of
testing an EAE operation; i.e., the program repeats the EAE AC sign test and does not
proceed to multiply/divide test. (Note: The
program tests SW3 before SW4.)

Cycle all sections

At the completion of 77 posses through the
Set-Up Test, the program proceeds to the
Random Multiply and Divide Test. At the
completion of posses through Random Test
the program repeats the Set-Up Test.

Holt after Set-Up or Random Test.

Error printout for module lookup (to be
supplied later).

Start-Up and/or Entry
Start up, Section 1
Set AC switches = 000000
Set address =6512
Press START

Start Up, Section 2
Set AC switch

000000

Se t address '" 6515
Press START

3.5

Errors in Usage
Hardware malfunctions detected in Section 1 will result in an error halt. Refer to the listing

using the address in the memory register to identify the error.
Hardware malfunctions detected in Section 2 will result in an error typeout on the teleprinter,
and a processor halt.
a.

Error typeouts are in standard format and inclvde the fo II owi ng information.

Type of failure, multiply or divide.

Initial problem set-up, contents of the AC, MQ, and the divisor and multipHcand.

The results of the instruction, i.e., if divide, the quotient and remainder; if multi-

ply, the high and low order product. A comparison of thl.: results {software vs hardware}.
e.

A printout of the ratio of failure, based on 100 octal iterations.

If the ration is small, it is recommended that CONTINUE be depressed to find a

setup that produces a higher failure ratio.
g.

Then set the address register equal to the contents of the AC and depress START.

This will generate a simulated printout of the EAE failure. After the printout the program will go into
a scope loop, executing the instruction that foiled.
The abbreviations used by the header are as follows:
Abbreviation

Meaning

C(L}

The information under this header is the contents of LINK.

C(AC)

The information under this header is the contents of AC.

C(MQ)

The information under this header is the contents of MQ.

C(SC)

The information under this header is the contents of SHIFT
COUNT.

(DIVISOR)

The information under this header is the contents of MB not sign corrected.

(MULTIPLICAND)

The information under this header is the contents of MB not sign corrected.

.....,'

Error, Typeout Examples:
n.

Sign Multiply
MULS FAILED

MULTIPLIER
705722

MULTIPLICAND
167372

HIGH ORDER PRODUCT

LOW ORDER PRODUCT
133015
762343

SOFTWARE
762343
HARDWARE
762443
OUT OF 100 CHECKS BAD 100
6571XX
(XX = SHIFT COUNT)

Sign Divide
DIVS

C(DIVISOR)
235012

REMAINDER
146136
146135

QUOTIENT
741320
SOFTWARE
HARDWARE
741320
OUT OF 100 CHECKS BAD 1
6443XX
(XX = SHIFT COUNT)
c.

C(MQ)
304176

C(AC)
223506

(Overflow condition that should set link on divide)
BAD LINK FAILED TO SET
DIVS FAILED
C(DIVISOR)
172052

AC
160723

C(MQ)
403073

SOFTWARE
HARDWARE

QUOTIENT
604323
604323

REMAINDER
263471
263471

Example of Multiply Simulation
MULS FAILED

SOFTWARE
HARDWARE
OUT OF 100 CHECK BAD 100
65711 0
(10 SHIFTS)

MULTIPLIER (AC)
235037

MUL TIPLICAND
534247

HIGH ORDER PRODUCT
754134
754134

LOW ORDER PRODUCT
257305
57305

C(L}

C(AC)

C(MQ)

0
0
0
0

0
121654
172602
217155
231342
236435
117216
47507
754134

235037
116417
47207
23503
411641
204720
502350
241164
257305

0
0
0

0
0

((SC)
70 (2'5 compliment of 10,
71

72
73
74
75
76
77
0

til
~

Example of Divide Simulation

SOFTWARE
HARDWARE
OUT OF 100 CHECKS BAD 0
(21 SHIFTS)
644321

QUOTIENT
665007
666112

C(MQ)
567264
REMAINDER
666055
113135

C(l)

C(AC}

C(MQ}

C(SC}

0
1
0
0
1
0
1
0

67505
20232
701505
742172
73344
747730
56641
776522
134224
131470
124201
111422
64065
11172
663404
705771
752742
111722
666055

56726:!
356550
735321
672642
565504
353211
726422
655045
532112
264225
550453
321127
642257
504537
211277
422576
45374
112770
665007

57 (2's compliment of 21)
60
61
62
63

1
0
0
0
1

C(AC)
710272

C(DIVISOR)
136760

DIVS FAILED

64
65
66
67
70
71
72
73
74
75
76
77

0
0

3.6

Recovery from such Errors
In Section I, a malfunction causes a processor halt. In Section 2, a malfunction will gen-

erate an error typeout, then halt the p!'oce5sor.
One of the following operations may be necessary if more information about the failure is
needed to repair the malfunction.
a.

Repeat the exact operation that detected the failure (possibly a scope loop).

Continue normally in the test to generate more information about the failure.

Repeat the sequence of operation, or data patterns that detected the fai lure.

Produce a simulation printout of failing multiply or divide instruction.

AC switch control is built into the program to allow for any of these operations assuming
the processor has halted after an error.

These operations may be accomplished as follows:
a.

Repeat same operation
Set AC switch 2 up or to a 1
Press CONTINUE
Not that AC switch 0 allows deletion of error typeout for a scope loop.

Continue normally
Press CONTINUE

Repeat Sequence
Set AC switch 4 up to a 1
Press CONTINUE

Simulation Printout
Set Address Switch = C(AC)
Press START
(At completion of Printout the program goes to on automatic scope loop.)

PROGRAM DESCRIPTION

4.1

General

The PDP-9 EAE Diagnostic part 2 verifies correct operation of the Multiply and Divide EAE
Instruction. Part 2 itself is written in two logical sections as follows.
Section i-Set up test using fixed number
Verifies correct operation of all EAE Multiply and Divide instructions with fixed numbers.
Section 2 - Random Number
Verifies correct operation of signed Multiply and Signed Divide instruction with random
numbers.
The above sections are to be run sequentially; that is, Section 1 must· run before Section 2.

4.2

Test Descri ption

4.2.1

Section 1 Set-Up Test - The Set-Up Test incrementally verifies correct operation of, the

multiply and divide instruction.

·
.
"ADVP" Checks that the memory location following the multiply and/or divide

instruction is not modified by the execution of the instruction and that the program address counter is
properly incremented during the execution of the instruction.
b.

"NEAE" Set up check - Checks the set-up of all EAE signed, unsigned, integ~r

and fraction, multiply and divide instructions. These instructions are executed with a shift count of
zero.
c.

"SHCT" Shift Counter Test - Executes the Multiply instruction sequentially starting

at a shift count of 1 and incrementing it up to a shift count of 22.
d.

"STMUl" Sign multiply and divide test - Test all signed multiply and divide

"MUlTST" Multiply and Divide Test - This test using worse-case number patterns

instructions.

ac ts as both a EAE and Adder Test.

"MSPEED" Speed Multiply and Divide - This test is in three operations: (1) a

sequence of multiply instructions are executed bock to back, (2) then a sequence of divide instruc<ions

~re e)tecuted, (3) followed by a sequence of MUl, DIY, MUL, and DIY executed bock to bock.

4.2.2

Section 2 Random Data Multiply and Divide Test - The Random Data Test verifies that the

EAE will multiply and divide random numbers at shift counts 1 through maximum (22 for multiply, 23 for
divide) and checks that the LINK is set on divide averflow.
The sequence of testing is as follows:
a.

Test the Multiply

(l) Generate a random number
(2)

Do a software multiply

(3) Do a hardware multiply
(4) Compare the results of both operations
(5)
b.

lOOP BACK TO 1 TILL DONE

Test the Divide
(J)

Generate a random number

(2)

Do a software divide

(3)

Do a hardware divide

(4) Cam pare the results of both operations
(5)

lOOP BACK TO 1 TIll DONE