SEG 1907 src/dps8/dps8_iom.c p -> SEG, SEG 1942 src/dps8/dps8_iom.c p -> SEG, SEG 2406 src/dps8/dps8_iom.c p -> SEG = 1; // pat. step 45 SEG 2717 src/dps8/dps8_iom.c p -> SEG = 0; // pat. FIG. 2, step 44 SEG 182 src/dps8/dps8_iom.h word1 SEG; // pg B21