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Article #19330Re: What's wrong with OPTi chipsets?
From: Wolfgang R. Mueller
Date: Fri, 08 Jan 1993 06:27
Date: Fri, 08 Jan 1993 06:27
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In article <1993Jan7.174610.18631@murdoch.acc.Virginia.EDU> rhh2h@fulton.seas.Virginia.EDU (Ron Henderson) writes: >Why is it that most 386 buyers specify that they do *not* want >motherboards with the Opti chipset? I may be in the market for a >386/40 mb, and want to be informed. > The Opti chipset is a bit inflexible concerning shadow ram allocation. It does not allow to map those parts of those certain 384 K, which are not used for shadow ram, to the end of the extended memory. On other chipsets this gives you extra 256 K extended memory. With Opti the 128 K covered by vga display (a0000-bffff) are totally lost, the 128+ K between cxxxx/d0000 and effff can only be mapped in place. With increasing ram sizes this hurts less and less. Greetings, Wolfgang R. Mueller <dvs@ze8.rz.uni-duesseldorf.de>, Computing Centre, Heinrich-Heine-University, Duesseldorf, Germany.
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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!wupost!spool.mu.edu!umn.edu!math.fu-berlin.de!unidus.rz.uni-duesseldorf.de!mueller.rz.uni-duesseldorf.de!dvs From: dvs@ze8.rz.uni-duesseldorf.de (Wolfgang R. Mueller) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: What's wrong with OPTi chipsets? Date: Fri, 8 Jan 1993 06:27:39 GMT Organization: Computing Centre, Heinrich-Heine-University, Duesseldorf, Germany Lines: 17 Distribution: usa Message-ID: <dvs.43.726474459@ze8.rz.uni-duesseldorf.de> References: <1993Jan7.174610.18631@murdoch.acc.Virginia.EDU> NNTP-Posting-Host: mueller.rz.uni-duesseldorf.de