Announced April 7, 1964 and
withdrawn March 15, 1977.
The IBM System/360 Model 50 had approximately ten times the internal power of the Model 30 when performing a mix of computations. It was the most powerful unit in the medium price range with communication facilities.
Typical arithmetic operations per second
| Decimal add (5 + 5 digits) | 50,000 | |
| Fixed point add (1 word + 1 word) (32 bits) | 307,600 | |
| Fixed point multiply (1 word x 1 word) | 36,000 | |
| Fixed point divide (2 words div. by 1 word) | 28,700 | |
| Floating point multiply (1 word x 1 word) | 48,200 |
Feeds & speeds
| Speed | Data width (bits) | |
|---|---|---|
| Machine cycle time | 500 nanosec. | |
| Logic circuits | 30 nanosec. | 32 |
| Memory cycle time 64K, 128K, 256K |
2 microsec. | 32 |
| Registers 16 general purpose 4 floating point |
500 nanosec. 1 microsecond |
32 64 |
| Control Read only storage |
500 microsec. |
|
| Bulk core storage 1,048,576 to 8,388,608 |
8 microsec. | 32 |
| Data rate per channel (Char. a Sec.) |
Control units per channel |
I/O units per channel |
|
|---|---|---|---|
| Channels: Selector (up to 3) |
800,000 |
8 |
256 each |
| High Speed |
1,250,000 |
||
| Multiplexor Multiplex mode Burst mode |
40,000 200,000 |
8 |
248 |