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- 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
-
- 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.
-