PC System Design Guide: Difference between revisions

Revision as of 11:09, 3 June 2023

Revision as of 03:03, 7 July 2023

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PC 2001 removes compatibility for the [[A20 line]]: "If A20M# generation logic is still present in the system, this logic must be

terminated such that software writes to I/O port 92, bit 1, do not result in A20M# being asserted to the processor."<ref>{{cite book |url=https://www.tech-insider.org/windows/research/acrobat/001102/03sys-2001.pdf |publisher=Intel Corporation and Microsoft Corporation. |title=PC 2001 System Design Guide |chapter=Chapter 3 PC System |quote=SYS–0047. A20M# is always de-asserted (pulled high) at the processor |page=52 |access-date=2023-06-03 }}</ref>

== Color-coding scheme for connectors and ports ==