RH>  JdBP>             18.2Hz is the frequency of the "system
 RH>  JdBP> heartbeat" interrupt   which drives all thread scheduling in
 RH>  JdBP> the system.  54ms is the   "quantum" for
timeslicing.  You
 RH>  JdBP> cannot get finer resolution than 1   quantum.
 
 RH> Since the early days of OS/2 I have not heard 
 RH> anything else than that the OS/2 heartbeat is 32 Hz 
 RH> (31.25 ms interval). In a DOS session it may be 
 RH> 18.2 Hz for the 'softhearted'!
 
    Seperate timers. The 18.2 Hz timer that's carried over from the
original PC is still there, but unless I'm mistaken, isn't used for
timeslicing: that job is taken care of by reprogramming the real time clock
to scream every 31.25 ms (more on my machine since my RTC is running slow
). Now that I think about it, that's why the HW_TIMER option for
DOS sessions is possible - OS/2 doesn't need the timer for itself anyway.

--- Maximus/2 2.01