IBM System/360 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.
About 20 Model 195 systems were produced.

Technical specifications

The basic CPU cycle time is 54 nanoseconds. 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 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).

Components

The 360/195 has the following components:

2160 Model l System Console
2180 CPU Power Unit
2185 Power Distribution Unit
2186 Coolant Distribution Unit
2195 Processing Unit
2860 Selector Channel
2870 Multiplexer Channel
2880 Block Multiplexer Channel

Legacy

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.