IA                945 src/dps8/dps8_cpu.h     word4 IA;      // 20-23 IA        System control illegal action lines
IA                521 src/dps8/dps8_faults.c     cpu . cu . IA               = 0;
IA                622 src/dps8/dps8_faults.c           cpu . cu . IA        = 0;
IA                624 src/dps8/dps8_faults.c           cpu . cu . IA        = 010;
IA                783 src/dps8/dps8_faults.c     cpu.cu.IA        = 0;
IA                375 src/dps8/dps8_ins.c     putbits36_4 (& words[1], 20, cpu.cu.IA);
IA                628 src/dps8/dps8_ins.c