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IBM 2365 Processor Storage

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The IBM 2365 Processor Storage was a component of the IBM System/360 models 65, 67, 75 and 85 computers. Storage was implemented using magnetic cores, and the cycle time was 750 nanoseconds. Memory fetch and store were 8 bytes at a time. Including the parity bits, this meant that a storage word was 72 bits wide. The IBM 2365 model 1 contained 131,072 bytes of memory; all other models contained 262,144 bytes. The model 2 could be converted in the field to a model 13.

All models other than the model 1 consisted of two memory stacks. Addressing for the stacks was interleaved, so the first 64-bit word was in one stack, the second in the other stack, and so forth. This improved performance when doing sequential access.

The various models were used as follows:

  • Model 1 was used on the System/360 model 65 when not used as a multiprocessor.
  • Model 2 was used on the System/360 models 65 (when not used as a multiprocessor) and 67-1.
  • Model 3 was used on the System/360 model 75.
  • Model 5 was used on the System/360 model 85.
  • Model 12 was used on the System/360 model 67-2.
  • Model 13 was used on the System/360 model 65 when used as a multiprocessor (M65MP).

References

  • IBM (September 1968). IBM System/360 Model 65 Functional Characteristics (PDF). Fourth Edition. A22-6884-3. {{cite book}}: Unknown parameter |separator= ignored (help)CS1 maint: extra punctuation (link)
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