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