IBM System/370
The System/370 continued the tradition of the prior System/360 by expanding the instruction set, and adding hardware support for both virtual memory (except for the first two models announced), and the new ability of virtualization.
They ran a variety of software, such as MVS, and the newer VM/370.
The System/370 was supplanted by the S/390.
Specs
- Sixteen 32-bit control registers, in supervisor mode only
- Sixteen 32-bit general purpose registers
- Four 64-bit floating point registers (could be paired as two 128-bit floating point registers)
- 24 bit address space for a maximum 16MB of RAM (later models: 31 bits)
Models
| Model | Announced | Shipped | Withdrawn |
|---|---|---|---|
| 115 | 13 March, 1973 | March, 1974 | 9 March, 1981 |
| 115-2 | 10 November, 1975 | April, 1976 | 9 March, 1981 |
| 125 | 4 October, 1972 | April, 1973 | 9 March, 1981 |
| 125-2 | 10 November, 1975 | February, 1976 | 9 March, 1981 |
| 135 | 8 March, 1971 | April, 1972 | 16 October, 1979 |
| 135-3 | 30 June, 1976 | February, 1977 | 16 October, 1979 |
| 138 | 30 June, 1976 | November, 1976 | 1 November, 1983 |
| 145 | 23 September, 1970 | June, 1971 | 10 November, 1971 |
| 145-3 | 30 June, 1976 | May, 1977 | 16 October, 1979 |
| 148 | 30 June, 1976 | January, 1977 | 1 November, 1983 |
| 155 | 30 June, 1970 | January, 1971 | 23 December, 1977 |
| 158 | 2 August, 1972 | April, 1973 | 15 September, 1980 |
| 158-3 | 26 October, 1976 | September, 1976 | 15 September, 1980 |
| 165 | 30 June, 1970 | April, 1971 | 23 December, 1977 |
| 168 | 2 August, 1972 | May, 1973 | 15 September, 1980 |
| 168-3 | 18 February, 1976 | June, 1976 | 15 September, 1980 |
| 195 | 30 June, 1970 | August, 1973 | 9 February, 1977 |
Virtual memory hardware upgrades for the Models 155 and 165 (the only S/370 models which did not support virtual memory) were announced shortly after the announcement of the Models 158 and 168, but were available only to customers who already owned a Model 155 or 165. When this was installed, these models were known as 155-II's and 165-II's.
An Attached Processor (AP) version of the Model 158, and multi-processor versions of the Models 158 and 168, were made available in 1976; these are the “-3” updates.
Games
Well thankfully there seems to have been some games....
Emulation
The 370 can be emulated by the following emulators:
See also
Further reading
- Emerson W. Pugh, Lyle R. Johnson, John H. Palmer, IBM's 360 and Early 370 Systems, MIT Press, Cambridge, 1991
