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Int 15 Fn 5101 - System - Later Ps/2s - Expansion Unit, Return Configura [B]
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?)
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