pc98/cbus/sio.c

857 		 * Turn off MCR_IENABLE for all likely serial ports.  An unused
858 		 * port with its MCR_IENABLE gate open will inhibit interrupts
960 	 * register and prepare to leave MCR_IENABLE clear in the mcr.
961 	 * Otherwise, prepare to set MCR_IENABLE in the mcr.
966 	mcr_image = MCR_IENABLE;
1117 	 * (MCR_IENABLE was hidden).  This should leave the device driving
1208 	 * Leave MCR_IENABLE alone.  For ports without a master port, it gates
1437 	 *	o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
3559 	 * them by clearing the MCR_IENABLE bit, since that might cause
3562 	outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);