Caches and Extended Memory

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#1473

From: Pete Stoppani
Date: Fri, 09 Mar 1990 18:38

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My understanding is that memory above 1Meg (except for the first
64k above 1Meg) is accessible only when a 268/386/486 is in protected mode.
How does a hard disk cache driver use extended memory on a system running
MS-DOS?  Does it switch to protected mode?  Do the machines run in
protected mode all the time?  Neither seems right...What am I missing?
 
-- 
| Pete Stoppani                    | stoppani@decwet.dec.com                  |
| DECwest Engineering, Bellevue WA | decwrl!slough.enet!stoppani              |
|                                  | HPDESK: stoppani("decwet.dec.com")/hpunix|
| "The wise learn more from fools than fools learn from the wise."            |

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!wuarchive!decwrl!
From: stoppani@slough.enet.dec.com (Pete Stoppani)
Newsgroups: comp.sys.ibm.pc.programmer,comp.sys.ibm.pc
Subject: Caches and Extended Memory
Message-ID: <9003091838.AA21834@decwrl.dec.com>
Date: 9 Mar 90 18:38:04 GMT
Organization: Digital Equipment Corporation
Lines: 15