IBM 7090 User Manual

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Page #173 background image

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is

pressed,

the

program

halts

again.

At

this

time,

the

number

of

the

storage

location

is

seen

in

the

accumulator

and

the

contents

of

the

storage

location

are

seen

in

the

MQ.

Each

time

the

start

key

is

pressed,

the

number

and

contents

of

the

next

sequential

storage

location

are

displayed.

If

it

is

desired

to

display

storage

at

a

new

location,

press

the

reset

key,

place

the

new

address

in

the

operator's

panel

keys,

and

start.

Instructions

to

be

punched

in

the

card

are:

0

1

2

3

4

5

6

7

10

11

12

13

14

Op

IOCD

HPR

NOP*

NOP*

ENK

XCA

STA

LDQ

HTR

ADD

TRA

HTR

Decr

Tag

12

Adr

00000

00005

00000

00007

00011

00004

00001

Read

12

words

starting

at

O.

Halt

to

set

keys.

Location

of

this

instruction

becomes

0000.

Keys

to

MQ.

MQ

to

Acc.

Address

of

Acc

to

00005.

Load

MQ

from

address

in

Acc.

MQ

contains

word

whose

address

is

in

Acc.

Step

addres

s

in

Acc

by

one.

Repeat.

*

These

instructions

are

used

so

this

program

will

not

be

destroyed

even

if

a

diagnostic

program

using

a

trapping

mode

is

later

run

on

the

machine.

Store

Address

The

following

program

fills

each

memory

location

with

its

corresponding

address.

The

program

itself

only

takes

12

positions

in

upper

memory.

It

is

designed

so

that

if

sense

switch

1

is

left

up,

addresses

are

stored

in

all

memory

locations

from

00000

to

77773

before

the

program

destroys

itself.

If

sense

switch

1

is

placed

down

before

the

card

is

loaded,

the

program

stops

to

allow

the

operator

to

enter

an

address

on

the

keys.

When

the

start

key

is

pressed,

the

machine

stores

addresses

in

sequential

locations,

starting

at

the

address

placed

in

the

operator's

panel

keys.

Instructions

to

be

punched

in

the

card

are:

Op

Decr

Tag

Adr

0

IOCD

14

77764

1

TCOA

00001

2

TRA

77764

3

PSE

00161

Location

of

this

instruction

becomes

77764.

4

TRA

77772

5

HPR

Halt

to

enter

address

on

keys.

6

ENK

7

XCA

10

TRA

77773

11

CLM

172

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IBM 7090 Specifications

General

Category	Mainframe Computer
Introduced	1959
Transistor-based	Yes
Word Length	36 bits
Add Time	4.8 microseconds
Memory	Core memory
Memory (words)	32, 768 words