Timer interrupt frequency (50Hz vs 60 Hz)

The timer interrupt hits 60 timer per second in CoCos made in the Americas
and a couple of other places, and 50 Hz in Europe and elsewhere. This means
if I want to count seconds with BASIC's TIMER function, I need to be aware
which kind of CoCo I have, 50Hz or 60Hz. Is there a way to find out which
frequency I have by software?

I just thought of a horrid solution: count how many times a loop ran
between two interrupts, and apply some tolerance. Of course, I'd have to
set CPU frequency to baseline 0.89 MHz beforehand. Get typical values and
apply some tolerance. Do I really need to do that?

Juan Castro
Enviado do meu Olivetti Programma 101
http://retropolis.com.br

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