The Dorado: A High-Performance Personal ComputerThree PapersCSL-81-1January 1981ABSTRACTThis report reproduces three papers on the Dorado personal computer. Each has been, orwill be, published in a journal or proceedings.A Processor for a High-Performance Personal Computer, by Butler W.Lampson and Kenneth A. Pier. Appeared in Proc. 7th Symposium on ComputerArchitecture, SigArch/IEEE, La Baule, May 1980, 146-160.An Instruction Fetch Unit for a High-Performance Personal Computer, byButler W. Lampson, Gene A. McDaniel, and Severo M. Ornstein. Submitted forpublication.The Memory System of a High-Performance Personal Computer, by DouglasW. Clark, Butler W. Lampson, and Kenneth A. Pier. A revised version will appear inIEEE Transactions on Computers. The first paper describes the Dorado's micro-programmed processor, and also gives anoverview of its history and physical construction. The second discusses the instruction fetchunit, which prepares program instructions for execution, and the third deals with the cache,map and main storage of the Dorado's memory system.c Copyright 1981 by Xerox Corporation.XEROXPALO ALTO RESEARCH CENTER3333 Coyote Hill Road / Palo Alto / California 94304ÿî ·ï\�pôŸî ·ïY>ð$î ·ïSQô€î ·ïL×qîûôXî ·ïDorî ·ïADsô™ðJôšî ·ï?Àô€ð+î­ï<•qô-ð!ô.s î­ï;ôÎð#tôÏî­ï9� sô€usî­ï6bqôØôÙð#sî­ï4ÞôÞôßð'î­ï3Z î­ï0/qô®ð-ô¯s î­ï.«ô•ð)ô–ð(î­ï-'vtô€î ·ï)üsôØðHôÙî ·ï(xôƒð@ô„î ·ï&ôô”ô•ðHî ·ï%pô€ð0î ·ïíwxuð$î)XïŒyî)aïqôXî)aïÊrôGð0²TVk(´2This page should not appear in the published report.Please note that the pages are numbered continuously for all three papers, including the titlepage for each paper, but excluding the title page for the entire report. Pages have been laidout with the assumption that an even page and the next odd page will form a double-pagespread. All the title pages are odd numbered, and the next (even) page is the first text page,which should appear on the reverse of the title page. A blank page should appear on thereverse of the title page for the entire report. Page 20, at the end of the first paper, is blankso that the title page of the second paper will fall on an odd page.ÿî ·ïf2xî ·ï_Ûsô€õð0î ·ïY…ô‚ð.ôƒð*î ·ïXô‚ôƒðQî ·ïV}ô�ôžð@î ·ïTùô�ðGô‚î ·ïSuô¡ðSî ·ïQñô‡ðEôˆî ·ïPmô€ðBÿ¨TVk(M Helvetica Helvetica  Helvetica Helvetica  Helvetica  Helvetica HelveticaMath  TimesRoman  LogoL³ÿÿj/ “0ÞÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿDoradoCover.bxDakeJanuary 13, 1981 3:15 PM