K. Pruitt wrote: > Under NitrOS-9, is a tick 16.67 milliseconds on both the 6809 and 6309? > > Thanks > > > > That should be a function of the crystal circuitry not the cpu. There is no indication in the defs files that there are timing changes beyond 50 or 60Hz systems. So on a 60Hz system the tick is the same for both 6809 and 6309 CPUs.