IBM 7090 User Manual

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(1)

Input

-0

+TO

(3)

Set

I

i I I i

I

I

I I

i I

i

I

i

I

lL

'i

I-

i

I

I

I

!

I

I

I

I

9-+-

I

i

I

I

Hold

Input

2)

I

+TA

3)

I

(4)

+TO

5

I

i

I

4)

I

lit

i

I

i

I

I

i

5)

I

• ! 'I

,

LL

_____

-

~t-

-'1-~

.

I

i '

6)

! I

I

II

I

I

I

I

I

I

Set

Each

Divi

sion Equal s

20

Nanoseconds

-A

Hold

Output

FIGURE

3.1-2.

SHIFT

CELL

Reset

Count

Count

Count Caunt

=0

= 1

= 2

=3

(X

=

On;

0 =

Off)

High Order

0

0

0 0

Low

Order

o

X

o X

Input

1st

Pulse

2nd Pulse 3rd Pulse

FIGURE

3.1-3.

COUNT-UP

COUNTER

25

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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