IBM 7090 User Manual

Whole Numbers
1.
510
58
10
1
2
2.
1125
10
2145
8
10 001 100 101
2
3.
177
8
1 111 1112
127
10
4.
1325
8
1
011 010 1012
72510
5.
77778
111 111 111 1112
4095
10
6. 1 101 0102
'
152
8
10610
7. 1 111 1112 177
8
127
10
8. 1
010 1012
125
8
85
10
9.
4096
10
100008
1 000 000 000 000
2
10.
333310
6405
8
110 100 000 1012
Fractions
1.
0.710
0.
546
8
0.101 100 1102
2.
0.
25
10
0.28
0.012
3.
0.33
10
0.
251
8
0.010 101 0012
4. 0.145
10
0.
112
8
0.001 001 012
5.
0.915
1
0
0.
724
8
0.111 010 12
6.
0.48
0.12 0.510
7.
0.
57
8
O. 101 1112
0.
734
10
8.
0.
715
8
0.111 001 1012
0.910
9.
0.
101
2
0.58
0.
625
10
10.
0.101 0102
0.
52
8
0.
656
10
Improper Fractions
1.
17.
05
10
21. 0318
10 001. 000 011 012
2.
40.96
10
50.
753
8
101 000.111 101 0112
3.
17.
05
8
1
111. 000 1012
15.
078
10
4.
77.778
111 111 . 111 1112 63.984
10
5.
11. 112
3.38
3.
375
10
6.
10.012
2.2
8
2.
25
10
11

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