Talk:Intel 8237

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This page should contain references to Intel 8257. 14.139.196.5 (talk) 16:35, 18 November 2012 (UTC)[reply]

AMD Design[edit]

The 8237 DMAC was originally designed by AMD and known as Am9517A^[1] under AMD nomenclature. The Am9517A itself seems to be a development of Intel 8257^[2]. — Preceding unsigned comment added by Skiselev (talk • contribs) 05:45, 23 April 2013 (UTC)Skiselev (talk) 05:50, 23 April 2013 (UTC)[reply]

I believe that the 8257 is a i8080 part. The 8237 is listed with the MCS-85 chipsets. TaylorLeem (talk) 03:08, 26 May 2021 (UTC)[reply]

References[edit]

^ "Am9517A/8237A Datasheet" (PDF).
^ "Am8257/9757 Datasheet" (PDF).

DMA misses[edit]

The register Memory Management Unit accompanying the i8237 is the 74LS612 with 16 by 12bit registere with the A12-A15 selecting a 12-bit register which concatenated with the remaining 12 lower address bits to give a 24 bit address. Hence actual DMA pages will match the Windows virtual memory pages of 4K. As the 74LS612 was an integral part of i8237 usage, this article should contain a reference. TaylorLeem (talk) 03:05, 26 May 2021 (UTC)[reply]

[1] "Am9517A/8237A Datasheet" (PDF).

[2] "Am8257/9757 Datasheet" (PDF).

[1]

[2]