MReg1IO          2569 drivers/tty/rocket.c 	CtlP->MReg1IO = MudbacIO + 1;
MReg1IO           313 drivers/tty/rocket_int.h 	ByteIO_t MReg1IO;
MReg1IO           833 drivers/tty/rocket_int.h #define sGetControllerIntStatus(CTLP) (sInB((CTLP)->MReg1IO) & 0x0f)