Article View: comp.sys.ibm.pc
Article #8810Re: 640K limit
From: Ted Cantrall
Date: Wed, 17 Jan 1990 17:57
Date: Wed, 17 Jan 1990 17:57
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In article <1990Jan17.031934.3374@esegue.segue.boston.ma.us> johnl@esegue.segue.boston.ma.us (John R. Levine) writes: >In article <4308@brazos.Rice.edu> solomon@screech.rice.edu (Richard L. Solomon) writes: >>>Simple. IBM/MicroSoft *should* have used soft pointers to the I/O memory >>>areas. >> NO....they SHOULD have mapped the I/O in the I/O ADDRESS SPACE where -- How would things have worked out if IBM had put this 384k block at the bottom of the memory (0-384). That would have left no constrictions on upward expansion except the 8088. And that problem would have been remedied by the 80286. -ted- ------------------------------------------------------------------------------- ted@helios.ucsc.edu | "The opinions are mine... (408)459-2110 | ...the facts are public domain." -------------------------------------------------------------------------------
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!bionet!agate!saturn!helios!ted From: ted@helios.ucsc.edu (Ted Cantrall) Newsgroups: comp.sys.ibm.pc Subject: Re: 640K limit Message-ID: <10344@saturn.ucsc.edu> Date: 17 Jan 90 17:57:18 GMT References: <4668.25aed7f2@uwovax.uwo.ca> <1468@blackbird.afit.af.mil> <28808@amdcad.AMD.COM> <729@jethro.Corp.Sun.COM> <4308@brazos.Rice.edu> <1990Jan17.031934.3374@esegue.segue.boston.ma.us> Sender: usenet@saturn.ucsc.edu Reply-To: ted@helios.ucsc.edu (Ted Cantrall) Organization: UCO/Lick Observatory, Santa Cruz Lines: 16