IA_ISA2
MFP->mf_ipra = (u_int8_t)~IA_ISA2;
} while (MFP->mf_ipra & IA_ISA2);
single_inst_bset_b(MFP->mf_imra, IA_ISA2);
single_inst_bset_b(MFP->mf_imra, IA_ISA2);
single_inst_bset_b(MFP->mf_iera, IA_ISA2);
single_inst_bclr_b(MFP->mf_imra, IA_ISA2);