Windows XP: reading and writing to CMOS RAM

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1 total messages Started by Simon Elliott Thu, 05 Oct 2006 19:46

#3106

Author: Simon Elliott
Date: Thu, 05 Oct 2006 19:46

15 lines
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Hi

I want to read and write to the CMOS RAM where the BIOS parameters are
held. Should I use a port I/O driver and access port 0x70 and 0x71 or
is there a better way? (I'm aware Windows XP maintains a memory map of
this area but as far as I know this is only a shadow of the CMOS RAM
and changing it doesn't actually write bytes to the CMOS RAM.)

Can anyone point to any info on this, and on recalculating the CMOS
checksum once I've written some bytes to the CMOS?

TIA!

-- 
Simon Elliott    http://www.ctsn.co.uk

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