How to delay until a next increment of time occurs ?

[R.Wieser]

Dennis,

> The R-Pi has never, to my knowledge, been billed as suitable
> for industrial/real-time/process-control...

I have not read those specs to be honest.   But for some reason I assumed 
that a 1.4 GHz machine should easily be able to generate a 1.6 KHz signal, 
even using Python.   I was wrong. It can, but just barily and not without 
jitter and hickups.  Lesson learned.

Regards,
Rudy Wieser