Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watnot!watmath!clyde!bellcore!faline!ulysses!gatech!mcnc!seismo!ll-xn!ames!pioneer!lamaster From: lamaster@pioneer.UUCP Newsgroups: comp.arch Subject: Re: register saving on context switch Message-ID: <535@ames.UUCP> Date: Wed, 4-Mar-87 20:21:05 EST Article-I.D.: ames.535 Posted: Wed Mar 4 20:21:05 1987 Date-Received: Fri, 6-Mar-87 23:39:02 EST References: <4376@columbia.UUCP> <448@cpocd2.UUCP> <5763@amdahl.UUCP> <542@houxv.UUCP> <670@brl-sem.ARPA> Sender: usenet@ames.UUCP Reply-To: lamaster@pioneer.UUCP (Hugh LaMaster) Organization: NASA Ames Research Center, Moffett Field, Calif. Lines: 31 In article <670@brl-sem.ARPA> ron@brl-sem.ARPA (Ron Natalie ) writes: >In article <542@houxv.UUCP>, rdt@houxv.UUCP (R.TRAUBEN) writes: > > Could anyone share with us how the CPU hardware and operating > > system coordinate their response to a faulted copyback midway > > thru an exchange jump? > > >Easy, first, the machines don't page. >Second, use better error correction, parity is for farmers. The CDC 6000's (e.g. 6600), 7600, Cyber 70's, and 170's don't page. The CDC Cyber 205 pages. The 205 has virtual memory (with 2 page sizes: small pages with 512, 2048, or 8192 words (small page size selectable) and large pages with 64K words), (words are 64 bits), and is generally, except for the memory-to-memory vector instructions which are microprogrammed, a somewhat RISCy machine. The Cyber 205 is a completely different architecture from the older Cybers. Hugh LaMaster, m/s 233-9, UUCP {seismo,topaz,lll-crg,ucbvax}! NASA Ames Research Center ames!pioneer!lamaster Moffett Field, CA 94035 ARPA lamaster@ames-pioneer.arpa Phone: (415)694-6117 ARPA lamaster@pioneer.arc.nasa.gov "In order to promise genuine progress, the acronym RISC should stand for REGULAR (not reduced) instruction set computer." - Wirth ("Any opinions expressed herein are solely the responsibility of the author and do not represent the opinions of NASA or the U.S. Government")