2FBB00BX0000 INT 2F - CATC USB4DOS Host Controller - INSTALLATION CHECK
2FBB00BX0001 INT 2F - CATC USB4DOS Host Controller - GET ???
2FBB00BX0002 INT 2F - CATC USB4DOS Host Controller - EXECUTE USB REQUEST
2FBB00BX0003 INT 2F - CATC USB4DOS Host Controller - ??? (POLLS VARIOUS I/O PORTS)
2FBB00 INT 2F - CATC USB4DOS Host Controller - INVALID FUNCTION