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Article #473Re: high byte of address question
From: Tim Smith
Date: Tue, 22 Jan 1985 23:00
Date: Tue, 22 Jan 1985 23:00
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In article <130@redwood.UUCP> rpw3@redwood.UUCP (Rob Warnock) writes: >+--------------- >| programming in assembly language to handle some special cases. I've >| noticed that the high byte of an address (the 68000 only uses the bottom >| 24 bits) is used alot in the Mac for special purposes. However, even when >+--------------- >NO, NO! SAY IT ISN'T SO! If they have done this, it's going to be a major >disaster when they go to a 68020, where those bits are significant. Don't They could always just leave the upper eight address lines unhooked on the 68020, thereby staying compatible! :-) -- Duty Now for the Future Tim Smith ihnp4!wlbr!callan!tim or ihnp4!cithep!tim
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arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxj!houxm!whuxlm!harpo!decvax!ittvax!dcdwest!sdcsvax!sdcrdcf!trwrb!scgvaxd!wlbr!callan!timReferences:
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 beta 3/9/83; site callan.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxj!houxm!whuxlm!harpo!decvax!ittvax!dcdwest!sdcsvax!sdcrdcf!trwrb!scgvaxd!wlbr!callan!tim From: tim@callan.UUCP (Tim Smith) Newsgroups: net.micro.mac Subject: Re: high byte of address question Message-ID: <292@callan.UUCP> Date: Tue, 22-Jan-85 18:00:43 EST Article-I.D.: callan.292 Posted: Tue Jan 22 18:00:43 1985 Date-Received: Fri, 25-Jan-85 21:34:05 EST References: <224@ucbopal.CC.Berkeley.ARPA> <130@redwood.UUCP> Reply-To: tim@callan.UUCP (Tim Smith) Organization: Callan Data Systems, Westlake Village, CA Lines: 15