fabs              390 src/dps8/dps8_math.c 
fabs              525 src/simh/sim_timer.c         fprintf (st, "  Peak Clock Skew:           %s%s\n", sim_fmt_secs (fabs(rtc_clock_skew_max[tmr])), (rtc_clock_skew_max[tmr] < 0) ? " fast" : " slow");
fabs              676 src/simh/sim_timer.c         if (fabs(skew) > fabs(rtc_clock_skew_max[tmr]))