TR_RATE          2528 src/dps8/dps8_cpu.c         cpu.rTR = (word27) (((word27s) cpu.rTR) - (word27s) (cpu.rTRticks / TR_RATE));
TR_RATE          2529 src/dps8/dps8_cpu.c         cpu.rTRticks %= TR_RATE;