Int 15/AH=21h

SYSTEM - POWER-ON SELF-TEST ERROR LOG (PS50+)

AH = 21h
AL = subfunction
00h read POST log
01h write POST log
BH = device ID
BL = error code

Return:
CF clear if successful
CF set on error
AH = status
00h OK
01h list full
02h unsupported subfunction
80h invalid command
86h unsupported function
if function 00h:
BX = number of error codes stored
ES:DI -> error log

Notes: The log is a series of words, the first byte of which identifies the error code and the second the device.. Supported by AMI PCI BIOS. IBM considers this a required BIOS function. If the device ID is FFh, the "error code" is the actual device number minus 255 (thus these devices have no specific error codes)

See Also: AH=23h"SYSTEM" - AH=24h"SYSTEM"

Category: Bios - Int 15h - S

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