[Coco] CoCo's TIMER and 60hz

[Allen Huffman]

> On May 29, 2019, at 7:47 PM, Bill Nobel <b_nobel at hotmail.com> wrote:
> 
> Allen, Roger sent me the test build which puts VSYNC on a pin I can test.  On power-up the rate comes back at 59.64 Hz. The moment I switch into double height in Nitros9 EOU it jumps to 60.11 Hz.  Roger is now working to get the lower res 32 column screen a bit better on the clock, but even if he does it still will be a bit off.

Are there other IRQ sources we can use for a Matchbox clock driver?

		— Allen