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    This function is available only on machines using the Micro Channel
    Architecture (MCA) bus.
 
    After a slot is enabled with Subfunction 01H, specific information
    can be obtained for the adapter in that slot by performing port
    input operations:
 
    Port            Function
    ════            ══════════════════════════════════
    100H            MCA ID (low byte)
    101H            MCA ID (high byte)
    102H            Option Select Byte 1
                      bit 0=1 if enabled,=0 if disabled
    103H            Option Select Byte 2
    104H            Option Select Byte 3
    105H            Option Select Byte 4
                      bits 6-7=channel check indicators
    106H            Subaddress Extension (low byte)
    107H            Subaddress Extension (high byte)
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