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August 29, 1961

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(1)

M 1123

I.. PERMANENT

'l!J~IIJ ____ M_E _M_O_R_A_N_D_U_M----I

PAG E 1 0 F3

DF634

DATE

August 29, 1961

SUBJECT .

Read Bl.nary Test

TO PDP-l Maintenance Personnel

ABSTRACT

This is a utility program designed to test the performance of the PDP Reader. As the reader reads a closed loop of tape of alternate ones and zeroes, each bit is checked against core memory.

FROM

steve Lambert

DIGITAL EQUIPMENT CORPORATION' MAYNARD, MASSACHUSETTS

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M-1123

Page 2 of 3

Introduction

When the reader test is performed, a check is made after every rpb command. The reader reads three characters and shifts them into the reader buffer. Then there is an 18 bit transfer from Reader Buffer to 10. The contents of the 10 are transferred to the accumulator. where all 18 bits are checked at once. Test word switches 0 to 18 vary the timing between rpb commands.

Operatinq Instructions

#1 Load read binary test into memory.

#2 Push stop button and examine button in order to turn off the rim flip-flop.

#3 Put closed loop tape for binary testing into reader and turn reader on.*

#4 Set test address switches to XXXX, the starting address, and push start.

#5 Vary the speed of the tape loop by setting test word switches 0 - 17.

#6 If the computer halts, the error will appear in the AC and the word just read will be in the 10.

#7 Vary the

+

ten volt margins on the reader, Input Mixer, and In-Out logic while using this test. Note in the

computer log book, the voltage and bit or bits that caused the· computer to halt.

Listinq

,read binary test ,S. Lambert

,use tape with all ones and zeroes opd jda 170000

org 0

start szs * 20 jmp test3 lat

dac c rpb

dib temp lac temp and a sas a

DIGITAL EQUIPMENT CORPORATION • MAYNARD, MASSACHUSETTS

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M-1123

Page 3 of 3

hIt .1ac c

jda count rpb

dio temp lac temp and b sas b hIt

lac c jda count jmp start

count 0

dap z lac count cma

dac count

q

isp count

jmp

q

z jmp

temp 0

a 770077

b 007700

c 0

jmp start end •

*The following generates tape for use with this rpb test:

start

a

tempI . temp2

lio tempI ppb

lio temp2 ppb

szs * 10 jmp start eli

jrnp a 770077 007700

DIGITAL EQUIPMENT CORPORATION • MAYNARD, MASSACHUSETTS

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