IO_RANGE

struct IO_Range_s {
    WORD IOR_Align;       // mask for base alignment
    WORD IOR_nPorts;      // number of ports
    WORD IOR_Min;         // min port address
    WORD IOR_Max;         // max port address
    WORD IOR_RangeFlags;  // flags
    BYTE IOR_Alias;       // alias offset
    BYTE IOR_Decode;      // alias decode key
};
typedef struct IO_Range_s IO_RANGE;

Contains information about a range of I/O port addresses.