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AX = DA20h BL = subfunction 00h set CMOS data field BH = CMOS data field number (00h-4Dh) CH = new value for bitfield (in lowest bits of register) 01h read CMOS data field BH = CMOS data field number (00h-4Dh)Return:
CH = value of bitfield CL = mask of valid bits
Note: Both CL/CH shifted to move valid bits into lowest pos 02h set CMOS byte CL = CMOS RAM address (00h-7Fh) CH = new value for CMOS byte 03h get CMOS byte CL = CMOS RAM address (00h-7Fh)
Return:
CH = value of CMOS byte 04h update CMOS checksums
Note: Sets 2Eh/2Fh to checksum of 10h-2Dh and 7Eh/7Fh to checksum of 48h-7Dh 05h verify CMOS checksums
Return:
CF clear if checksums OK AH = 00h CF set if checksum mismatch AH = 01h
Return:
CF clear if successful AH = 00h CF set on error AH = error code (86h unsupported function/data field)
Notes: This function was not supported by the v1.00.05.AX1 BIOS, but had been added by 1.00.12.AX1T. After using subfunctions 00h or 02h, the application must call subfunction 04h to update the checksums to prevent an error the next time the system is booted
(Table 00542) Values for AMI BIOS v1.00.12.AX1T CMOS bitfield identifier: ID address bit(s) contents 00h 1Ah 7-6 01h 1Dh 7-6 02h 6Eh 1 03h 77h 0 04h 77h 1 05h 77h 2 06h 77h 3 07h 77h 5 08h 77h 6 09h 77h 7 0Ah 78h 7 power management enabled??? 0Bh 78h 6 0Ch 10h 7-4 first floppy drive type 0Dh 10h 3-0 second floppy drive type 0Eh 11h 7 0Fh 20h 4-0 selected language for error messages/setup utility 10h 11h 2-1 11h 11h 4 12h 11h 0 13h 11h 3 14h 13h 7 15h 13h 6-5 16h 13h 4-2 17h 19h 7 18h 19h 6 19h 19h 5 1Ah 19h 4 1Bh 1Eh 2-0 1Ch 1Bh 7-6 1Dh 1Ch 7 1Eh 1Ch 3 1Fh 1Ah 5-4 20h 1Dh 5-4 21h 1Bh 5-4 22h 1Ch 6 23h 1Ch 2 24h 1Ah 3-2 25h 1Dh 3-2 26h 1Bh 3-2 27h 1Ch 5 28h 1Ch 1 29h 1Ah 1-0 2Ah 1Dh 1-0 2Bh 1Bh 1-0 2Ch 1Ch 4 2Dh 1Ch 0 2Eh 50h 7-0 2Fh 51h 7-0 30h 52h 7-0 31h 53h 7-0 32h 60h 0 33h 60h 0 34h 60h 0 35h 60h 0 36h 60h 0 37h 60h 0 38h 60h 1 39h 61h 7 3Ah 60h 2 3Bh 61h 6-4 3Ch 61h 2-0 3Dh 60h 7-6 3Eh 60h 5-4 3Fh 78h 5-4 40h 6Eh 5 41h 1Eh 3 42h 6Eh 0 43h 6Eh 2 44h 6Fh 1-0 45h 6Fh 1-0 46h 28h 4-2 47h 28h 7-5 48h 6Eh 4 49h 6Eh 3 4Ah 76h 7-0 4Bh 77h 4 4Ch 11h 6 4Dh 1Fh 7-0
Category: Vendor-specific BIOS Extensions - Int 15h - A
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