IBM System/360 Model 195
|Release date||August 20, 1969|
|Introductory price||$7–12.5 million|
|Discontinued||February 9, 1977|
|Predecessor||IBM System/360 Model 91|
|Successor||System/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. It offers "an internal processing speed about twice as fast as the Model 85, the next most powerful System/360". The Model 195 was discontinued on February 9, 1977, the same date as the System/370 Model 195.
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.
The normal operating system for the Model 195 is OS/360 Multiprogramming with a Variable Number of Tasks (MVT).
- gah (April 20, 2008). "The 360/91 and associated machines". email@example.com (Mailing list).
- "System/360 Model 195". IBM Archive. IBM. Retrieved June 28, 2017.
- Mark Smotherman. "Eager Execution / Dual Path / Multiple Path".
15 Model 91's and 2 Model 95's were built. Approximately twenty Model 195's were built.
- Michael J. Flynn (December 2, 1997). "Some Reflections on Computer Engineering: 30 Years after the IBM System Model 91" (PDF).
About twenty Model 91s were made, and perhaps an equivalent number of the Model 195.
- "IBM 360/370/3090/390 Model Numbers".