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Line 63: * 64 MB RAM Final version. First to require IO-[[Advanced Programmable Interrupt Controller\|APIC]]s to be enabled on all desktop systems. Places a greatly increased emphasis on legacy-reduced and [[legacy-free PC\|legacy-free]] systems. Some "legacy" items such as ISA expansion slots and device dependence on MS-DOS are forbidden entirely, while others are merely strongly discouraged.<ref>{{cite book\|url=http://www.freeopenbook.com/pc-hardware-nutshell-3/pchardnut3-chp-1-sect-1.html \|access-date=January 4, 2011 ~~\|url-status=dead~~ \|archive-url=https://web.archive.org/web/20110711032416/http://www.freeopenbook.com/pc-hardware-nutshell-3/pchardnut3-chp-1-sect-1.html \|archive-date=July 11, 2011\|isbn=0-596-00513-X\|page=1.1 PCs Defined\|edition=3rd\|title=PC Hardware in a Nutshell\|publisher=O'Reilly & Associates, Inc.\|~~authors~~author=Robert Bruce Thompson, \|author2=Barbara Fritchman Thompson \|date=24 July 2003 }}</ref> PC 2001 removes compatibility for the [[A20 line]]: "If A20M# generation logic is still present in the system, this logic must be

PC System Design Guide: Difference between revisions