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withdrawn October 7, 1977.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.
Typical arithmetic operations per second
| Decimal add (5 + 5 digits) | 24,600 |
| Fixed point add (1 word + 1 word) (32 bits) | 133,300 |
| Fixed point multiply (1 word x 1 word) | 12,000 |
| Fixed point divide (2 words div. by 1 word) | 5,400 |
| Floating point multiply (1 word x 1 word) | 13,100 |
Feeds & speeds
| Speed | Data width (bits) | |
|---|---|---|
| Machine cycle time | 625 nanosec. | |
| Logic circuits | 30 nanosec. | 8 |
| Memory cycle time 16K, 32K, 64K, 128K, 256K |
2.5 microsec. | 16 |
| Registers 16 general purpose 4 floating point |
1.25 microsec. 2.5 microsec. |
32 64 |
| Control Read only storage Special 1401 compatible feature |
625 microsec. |
| Data rate per channel (Char. a Sec.) |
Control units per channel |
I/O units per channel |
|
|---|---|---|---|
| Channels: Selector (up to 2) |
400,000 |
8 |
256 each |
| Multiplexor Multiplex mode Burst mode |
31,000 200,000 |
8 |
128 |