Int 15/AX=5101h

SYSTEM - later PS/2s - EXPANSION UNIT, RETURN CONFIGURATION NUMBER

AX = 5101h

Return:
CF set if successful
AH = 00h
AL = current configuration number
00h system unit only
FFh configuration not recognized
BX = status flag
bits 0-14:
Reserved
bit 15:
Additional data is available (location TBD).
CF clear on error
AH = status
01h expansion unit is not present
86h function not supported

Note: CF convention is the reverse of the standard convention for this interrupt. (Perhaps a typo in the IBM BIOS Tech Ref?)

Category: Bios - Int 15h - S

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