Article View: comp.os.msdos.programmer
Article #4954Re: XMS vs EMS (performance)
From: Marc Brandis
Date: Mon, 18 Feb 1991 10:10
Date: Mon, 18 Feb 1991 10:10
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In article <1991Feb15.204811.6327@qiclab.scn.rain.com> leonard@qiclab.scn.rain.com (Leonard Erickson) writes: > >Do recall that every time you switch *from* protected mode, the CPU gets >reset. This is true for the 286, but not for the 386. On a 20 MHz 386, you can switch back to real mode in about 10 microseconds if you trim down the code. The processor reset is not required, you can just clear a bit in CR0. Marc-Michael Brandis Computer Systems Laboratory, ETH-Zentrum (Swiss Federal Institute of Technology) CH-8092 Zurich, Switzerland email: brandis@inf.ethz.ch
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!cernvax!chx400!chx400!bernina!neptune!inf.ethz.ch!brandisReferences:
<1991Jan30.134859.22160@linus.mitre.org> <1991Feb15.204811.6327@qiclab.scn.rain.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!cernvax!chx400!chx400!bernina!neptune!inf.ethz.ch!brandis From: brandis@inf.ethz.ch (Marc Brandis) Newsgroups: comp.os.msdos.programmer Subject: Re: XMS vs EMS (performance) Message-ID: <25530@neptune.inf.ethz.ch> Date: 18 Feb 91 10:10:41 GMT References: <1991Jan30.134859.22160@linus.mitre.org> <1991Feb15.204811.6327@qiclab.scn.rain.com> Sender: news@neptune.inf.ethz.ch Reply-To: brandis@inf.ethz.ch (Marc Brandis) Organization: Departement Informatik, ETH, Zurich Lines: 14