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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!ukma!darwin.sura.net!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!ames!kronos.arc.nasa.gov!raymond
- From: raymond@kronos.arc.nasa.gov (Eric A. Raymond)
- Subject: Re: Cyrix 486DLC, Soundblaster Pro and do_cache.exe
- Message-ID: <1992Nov13.234623.12973@kronos.arc.nasa.gov>
- Sender: usenet@kronos.arc.nasa.gov (Will Edgington, wedgingt@ptolemy.arc.nasa.gov)
- Nntp-Posting-Host: copernicus-arclan.arc.nasa.gov
- Organization: NASA/ARC Information Sciences Division
- References: <1223@bazooka.amb.org>
- Date: Fri, 13 Nov 1992 23:46:23 GMT
- Lines: 23
-
- ti@bazooka.amb.org (Ti Kan) writes:
-
- >I have been using my 386 system (upgraded to a Cyrix 486DLC CPU chip)
- >for a couple of days and have discovered a problem...
-
- >If I run with the do_cache.exe program which enables the 486DLC internal
- >cache, the performance improvement is dramatic. However, enabling
- >the cache causes the Soundblaster Pro board to misbehave. Namely,
- >various programs that talk to the SBPro complains about "cannot detect
- >DMA channel" or somesuch.
-
- >If I run without running do_cache.exe, then the SBPro works fine.
-
- DMA messes up the consistency on the cache. That is, the
- memory is updated but the cache contains the old value. I don't think
- there is much you can do.
-
- Why don't you just turn off the cache when starting up SBPro and then
- on again upon exit with a batch file?
-
- P.S. Where did you get your chip? How much was it? Does it put out
- any more heat than the equivalent Intel chip? (I want to put it
- in a laptop).
-