C&A Computing & Automation System/360 Model 195

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Configuration

The 360/195 could be purchased with 1, 2 or 4 Mbytes of main store. Most systems were purchased with 2 Mbytes due to the high cost of memory. Rutherford paid nearly £400K for the third megabyte of memory and even more for the fourth (and it was second-hand!).

Invoice for Rutherford's third Megabyte of Memory

Invoice for Rutherford's third Megabyte of Memory
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A typical configuration would be a single CPU with 2 Mbyte core storage, an operator's console with a cathode-ray tube (CRT) display for diagnostics and operator control, three 2314 direct access storage facilities, two 2301 drum storage units, fourteen 2420 magnetic tape units, and several card read-punches and printers. Up to six selector channels and one multiplexer channel could be attached to a 360/195.

Purchase prices were between $7M and $13M depending on the configuration.

The Rutherford 360/195 inherited most of the peripherals from the 360/75. The fastest device was the 11 Mbyte IBM 2305 fixed head file. It provided fast access at a rate of 3 Mbytes/sec to frequently used system files. The read/write heads were fixed in position over each track which eliminated seek time. When the drive had completed a read or write, it disconnected allowing the channel to be used in accessing a different device during the latency period.

IBM 2305 Fixed Head File

IBM 2305 Fixed Head File

http://www-03.ibm.com/ibm/history/exhibits/storage/storage_2305.html

RAL's IBM 2305 Fixed Head File

RAL's IBM 2305 Fixed Head File
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Other peripherals included: