Int 15/AH=CAh

PS/2 Model 95 - READ/WRITE CMOS MEMORY

AH = CAh
AL = function
00h read CMOS
Return:
CL = value of CMOS location
01h write CMOS
CL = new value for CMOS location.
BL = CMOS location (0Eh-3Fh)

Return:
CF clear if successful
AH = 00h
CF set on error
AH = error code (see #00530)

Note: Writes do not update the CMOS checksum



(Table 00530)
Values for CMOS read/write error code:
01h    CMOS lost power or has invalid checksum
03h    specified location out of range (too high)
04h    specified location out of range (too low)
80h    unsupported function (PC)
86h    unsupported function (XT)

Category: Bios - Int 15h - P

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