IBM 7090 User Manual

To illustrate the operation and use of CAQ, a program which will convert BCD to
binary follows.
Convert BCD Word to Binary
709542 (BCD) converted to 2,551,646 (Octal)
Instructions required for this op~ration:
LDQ
A
(BCD
word)
CLM
(Clear AC)
CAQ 6, 0, 3000
(Convert to binary)
ARS 1610
(Position result in AC)
SLW
B
(Store result)
Storage table required for CAQ:
Storage
Contents
Storage
Location
(S-19)
(21-35)
Location
Decimal Octal
Decimal
Decimal
3000 0
3100
3300
3001
303,240 3100
3301
3002 606,500
3100
3302
3003
1,111,740
3100
3303
3004
1,415,200 3100
3304
3005
1,720,440
3100
3305
3006 2,223,700
3100 3306
3007
2,527,140
3100
3307
3008
3,032,400
3100
3308
3009
3,335,640
3100
3309
3100 0
3200
3400
3101 23,420
3200
3401
3102
47,040
3200
3402
3103
72,460
3200
3403
3104
116,100
3200
3404
3105
141,520
3200
3405
3106
165,140
3200
3406
3107
210,560
3200
3407
3108
234,200
3200
3408
3109
257,620
3200
3409
3200
0
3300
3500
3201
1,750
3300
3501
3202
3,720
3300
3502
3203
5,670
3300
3503
3204
7,640
3300
3504
3205
11,610
3300
3505
3206
13,560
3300
3506
3207
15,530
3300
3507
3208
17,500
3300
3508
3209
21,450
3300
3509
139
Contents
(S-19)
(21-35)
Octal
Decimal
0
3400
144
3400
310
3400
454
3400
620
3400
764
3400
1,130 3400
1,274
3400
1,440
3400
1,604
3400
0
3500
12
3500
24 3500
36
3500
50
3500
62
3500
74
3500
106
3500
120
3500
132
3500
0
1
2
3
4
5
6
7
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