Difference between revisions of "Talk:IBM System/360"
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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. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 14:26, 13 June 2018 (CEST) | 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. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 14:26, 13 June 2018 (CEST) | ||
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| + | Ah. The 360/67 'Functional Characteristics' is [http://www.bitsavers.org/pdf/ibm/360/funcChar/GA27-2719-2_360-67_funcChar.pdf online at Bitsavers], and it was indeed a full virtual memory system. In addition to paging, it also had segmentation. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:51, 13 June 2018 (CEST) | ||
Latest revision as of 15:51, 13 June 2018
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)
