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Int 15 Fn 21 - System - Power-on Self-test Error Log (ps50+) [B]
AH = 21h
AL = subfunction
00h read POST log
01h write POST log
BH = device ID
BL = error code
Return: CF set on error
AH = status (00h OK, 01h list full, 80h invalid cmd, 86h unsupported)
if function 00h:
BX = number of error codes stored
ES:DI -> error log
Note: the log is a series of words, the first byte of which identifies the
error code and the second the device.
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