mf_iera
MFP->mf_iera = MFP->mf_ierb = 0;
MFP2->mf_iera = MFP2->mf_ierb = 0;
MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */
MFP->mf_iera &= ~IA_TIMA; /* Disable timer interrupts */
MFP->mf_iera |= IA_TIMA; /* Enable timer interrupts */
MFP->mf_iera &= ~IA_TIMB; /* Disable timer interrupts */
MFP->mf_iera |= IA_RRDY|IA_RERR|IA_TRDY|IA_TERR;
single_inst_bset_b(MFP->mf_iera, IA_ISA2);