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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!zeos!jre
- From: jre@zeos.com (Jim Erickson)
- Subject: Re: Cyrix 486DLC Cache-enable code?
- Organization: Zeos International, Ltd
- Date: Fri, 13 Nov 1992 15:47:29 GMT
- Message-ID: <1992Nov13.154729.22570@zeos.com>
- References: <1221@bazooka.amb.org>
- Lines: 56
-
- In article <1221@bazooka.amb.org> ti@bazooka.amb.org (Ti Kan) writes:
- >I have a system which was upgraded from a 386DX (no external cache) to
- >the Cyrix 486DLC. The system runs fine, and with the DO_CACHE.EXE
- >program which enables the on-chip internal cache, the performance
- >increase is quite dramatic. This works under DOS since DO_CACHE.EXE
- >is a DOS executable.
- >
- >Unfortunately, I primarily run UNIX on this system and the default
- >mode of the 486DLC after reset is with the internal cache disabled.
- >I need to write a UNIX driver for the 486DLC to enable its cache.
- >
- >So, the question is this: Where can I find information about the
- >specific instructions necessary to enable the 486DLC internal cache?
- >Is there any sample source code available? Also, I want to make this
- >code enable the 486DLC cache only in the presence of such a chip.
- >Is there a way to detect a 486DLC (as opposed to a vanilla 386DX or
- >486DX)?
- >
- >If I can't get any info off the net I will probably have to try
- >Cyrix themselves. Does anyone have the technical info phone number
- >or address of Cyrix?
- >
-
- Contact Cyrix for the "Cx486SLC & Cx486DLC Application Notebook". It
- contains very useful information including sample code for the cache. You
- may also want to get the "Data sheet". The number I have for them is
- probably not the tech number but they should be able to direct you to the
- people you need to talk to:
- Cyrix Corporation
- 2703 North Central Expressway
- Richardson, Texas 75080
-
- (214)234-8387
- fax: (214)699-9857
- Hope this helps.
-
- ---JRE---
-
-
- >Thanks in advance...
- >
- >-Ti
- >--
- > /// Ti Kan vorsprung durch technik
- > /// AMB Research Laboratories, Sunnyvale, CA. USA
- > /// ti@amb.org
- > ////// ...!{decwrl,synopsys,tandem,tsoft,ultra}!sgiblab!bazooka!ti
- >/// ...!{uunet,sun,apple,sco}!altos!bazooka!ti
-
-
- --
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