argnoOffset      2859 src/dps8/dps8_sys.c                 word18 argnoOffset = (word18) ((M[argnoos + 1] >> 18) & MASK18);
argnoOffset      2861 src/dps8/dps8_sys.c                 if (dbgLookupAddress (argnoSegno, argnoOffset, & argnop, & msg))