Talk:Page address register

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Notability of page address registers

At least one way in which the concept of page address registers is notable is that a number of machines that implement demand paging do not do so with an in-memory page table; instead, they have a fixed set of registers that map virtual to physical addresses, provide a "page not present" indication, and may also provide a "write protected" indication. Several early machines mentioned in Memory paging § History do so (Atlas, SDS 940, IBM M44/44X, the modified IBM System/360 Model 40 used with CP-40 and, if I remember correctly, the IBM Spectra 70/46. In addition, the "Sun MMU" used in the Sun-1/Sun-1U machines, the Sun-2 machines, the Sun-3 machines prior to the Sun-3x machines, and the Sun-4 machines prior to the Sun-4m and Sun-4d machines was built from static RAM separate from CPU main memory, so they could be considered as having a large set of page address registers. Guy Harris (talk) 08:41, 7 August 2022 (UTC)[reply]