[Coco] CoCo's TIMER and 60hz

[Dave Philipsen]

Yeah, it seems like the only way you’d have a problem is if the CPU was halted for long enough that it missed an IRQ or if the service routine was flawed in some way. 

Dave

> On May 30, 2019, at 8:21 AM, Mark McDougall <msmcdoug at iinet.net.au> wrote:
> 
>> On 30/05/2019 3:14 am, Bill Nobel wrote:
>> 
>> The Coco3 was never accurate on software time due to fact the IRQ
>> line is shared with other devices besides VSYNC.  Yes they are queued
>> but arn’t serviced accurately based on time.
> 
> I don't see how shared interrupts can contribute at all to drift? That would only occur if a countdown timer was only reset when the interrupt is actually serviced which, to my knowledge, can't be the case with the VSYNC.
> 
> Regards,
> 
> -- 
> Mark McDougall
> <http://retroports.blogspot.com.au>
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco