IOASIC_INTR_300_OPT1
*imskp |= IOASIC_INTR_300_OPT1;
*imskp &= ~IOASIC_INTR_300_OPT1;
(ioasicir & ~(IOASIC_INTR_300_OPT1|IOASIC_INTR_300_OPT0)));
ioasicir & IOASIC_INTR_300_OPT1);
*imskp &= ~(IOASIC_INTR_300_OPT0 | IOASIC_INTR_300_OPT1);