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Announced April 7, 1964 and withdrawn October 7, 1977.
The IBM System/360 Model 40 had approximately three times the internal power of the Model 30 when performing a mix of computations. It was a powerful stand-alone system in the medium price range with communication facilities.
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Decimal add (5 + 5 digits) |
24,600 |
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Fixed point add (1 word + 1 word) (32 bits) |
133,300 |
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Fixed point multiply (1 word x 1 word) |
12,000 |
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Fixed point divide (2 words div. by 1 word) |
5,400 |
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Floating point multiply (1 word x 1 word) |
13,100 |
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Speed |
Data width (bits) |
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Machine cycle time |
625 nanosec. |
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Logic circuits |
30 nanosec. |
8 |
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Memory cycle time
16K, 32K, 64K, 128K, 256K |
2.5 microsec. |
16 |
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Registers
16 general purpose
4 floating point |
1.25 microsec.
2.5 microsec. |
32
64 |
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Control
Read only storage
Special 1401 compatible feature |
625 microsec. |
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Data rate
per channel
(Char. a Sec.) |
Control units
per channel |
I/O units
per channel |
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Channels:
Selector
(up to 2) |
400,000 |
8 |
256 each |
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Multiplexor
Multiplex mode
Burst mode |
31,000
200,000 |
8 |
128 |
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