IOP_REG_PC        840 drivers/scsi/advansys.c #define AscSetPCAddr(port, data)          outpw((port)+IOP_REG_PC, data)
IOP_REG_PC        841 drivers/scsi/advansys.c #define AscGetPCAddr(port)                (ushort)inpw((port)+IOP_REG_PC)