Re: Timer interrupt frequency (50Hz vs 60 Hz)
Allen Huffman via Coco <coco-uNHYcr1XS/wmlAP/[email protected]>
| Newsgroups | gmane.comp.hardware.tandy.coco |
|---|---|
| Message-ID | <[email protected]> |
> On Mar 20, 2025, at 4:17 PM, Juan Castro via Coco <[email protected]> wrote: > > 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? Considering this was one of the questions apps would ask (like Nick Marentes’ games), I think not :( > 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? That might indeed be the way to go. It would only take a 1/50th of a second, if you could time it that fast ;-) — A -- Coco mailing list [email protected] https://pairlist5.pair.net/mailman/listinfo/coco