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AH = 24h BP = 0012h (driver ID of V_SYSTEM) BL = address of CMOS byte to write AL = new value
Return:
AH = status (see #03744) BP,DS destroyed
Note: Updates the CMOS checksum fields (both IBM-standard and HP checksums)
See Also: AH=00h"HP Vectra" - AH=22h/BP=0012h
Category: Vendor-specific BIOS Extensions - Int 6Fh - H
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