[comp.sys.ibm.pc.hardware] BIOS EPROM checksum

janeri@Lise.Unit.NO (Jan Eri) (07/01/91)

hello,

Can anybody enlighten me on how the checksum in the PC BIOS
are calculated ? I suspect that the last byte are adjusted so
that the total checksum are nul, but I don't have an EPROM
burner handy, so I haven't bothered to experience.

I have several times patched BIOS'es to cope with unlisted
driveparameters, but so far I have solved the problem by adjusting
other entries in the drive table to avoid changing the checksum.

Also, does it exist any tools for simplifying this process?
I have tried two; CMOSER and HTMU, but none of them worked the
way I wanted them to :-( 

Prefer Email,

Thanx, Jan

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l--/   l   Jan Eri - -  The Norwegian Institute of Technology , Acoustics 
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