IBM System/360 Model 195
| File:IBM Logo 1967-1972.svg | |
| File:Bundesarchiv B 145 Bild-F038812-0017, Wolfsburg, VW Autowerk, EDV.jpg | |
| Developer | IBM |
|---|---|
| Release date | August 20, 1969 |
| Introductory price | $7–12.5 million |
| Discontinued | February 9, 1977 |
| Predecessor | IBM S/360 Model 91 |
| Successor | IBM S/370 Model 195 |
The IBM System/360 Model 195 is a discontinued IBM computer introduced on August 20, 1969. The Model 195 was a reimplementation of the IBM System/360 Model 91 design using monolithic integrated circuits.[1] It offers "an internal processing speed about twice as fast as the Model 85, the next most powerful System/360".[2] The Model 195 was discontinued on February 9, 1977, the same date as the System/370 Model 195.
About 20 Model 195 systems were produced.[3][4]
Technical specifications
[edit | edit source]The basic CPU cycle time is 54 nanoseconds (ns). The system has a high degree of parallelism and can process up to seven operations at a time. The system can be configured with 1, 2, or 4 MB of magnetic core memory (models 195J, 195K, and 195L) with a cycle time of 756 ns. A 32 KB cache, called a buffer memory in the IBM announcement, is standard. Memory blocks are brought into cache in units of 64 bytes.[2]
The normal operating system for the Model 195 is OS/360 Multiprogramming with a Variable Number of Tasks (MVT).
Components
[edit | edit source]The 360/195 has the following components:[5]
- 2160 Model l System Console
- 2180 CPU Power Unit[a]
- 2185 Power Distribution Unit
- 2186 Coolant Distribution Unit
- 2195 Processing Unit (which includes the Processor Storage)
- 2860 Selector Channel[b]
- 2870 Multiplexer Channel[b]
- 2880 Block Multiplexer Channel[b]
Legacy
[edit | edit source]The Model 195 was later updated as the IBM System/370 Model 195 with the new System/370 instructions and the 370 time-of-day clock and control registers, but without the virtual memory hardware.[6]
Notes
[edit | edit source]References
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