In article <0105010F.b54s7l@mprnews.mpr.com> mslater@mpr.com writes:
[deleted]
quoted text
>It is true that the cache must be enabled by initialization software,
>but this can be done by a program (supplied by Cyrix to its OEMs)
>that in part of autoexec.bat.
Is (assembler?) source to this/such a program going to be available,
so those of us not using DOS can use it?

quoted text
>The Cyrix chips have some additional signals to handle A20 masking
>and cache control, and for best performance, the hardware needs a
>small modification (a couple gates and a few wires) to support these
>signals. It is not absolutely necessary, however; the chips have software
>control registers that allow the needed functions to be implemented
>without any hardware mods, but there is a small performance hit. For
>example, without the hardware mods, the chip must make the first 64K
>of each 1 Mbyte region non-cacheable to avoid the A20 wrap-around
>problems.
I take it this is to avoid the Microsoft HMA kludge; can those of us
who use something besides DOS, or hold our right hands up and solemnly
swear not to use the HMA when we do, disable this feature?

quoted text
>Michael Slater, Microprocessor Report              mslater@mpr.com
>P.O. Box 2438, Sebastopol CA 95473  707/823-4004  fax 707/823-0504

        Keith
(rohrer@fncrd0.fnal.gov, where all followups/replies should be sent...)

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