Talk:IBM System/360

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Model 67 MMU

I thought the Model 67 had paging, not a base-and-bounds type mechanism? I looked in Pugh, Johnson, Palmer, "IBM's 360 and Early 370 Systems" to see, and alas it's not as explicit as I'd like, but it does say (pg. 362) that it contained "eight parallel search registers for recently used page table entries". Which makes it sound as if, like Multics and other paging machines of the era, it had a small in-CPU cache for page table entries. Jnc (talk) 14:26, 13 June 2018 (CEST)

Ah. The 360/67 'Functional Characteristics' is online at Bitsavers, and it was indeed a full virtual memory system. In addition to paging, it also had segmentation. Jnc (talk) 15:51, 13 June 2018 (CEST)