IA 946 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 782 src/dps8/dps8_faults.c cpu.cu.IA = 0; IA 371 src/dps8/dps8_ins.c putbits36_4 (& words[1], 20, cpu.cu.IA); IA 624 src/dps8/dps8_ins.c