[Coco] CoCo's TIMER and 60hz

[Brock Harrison]

Of course, the interminable VSYNC cycle length renders my initial
suggestion impractical.  My apologies.

Still, evaluating age-related frequency drift seems worthwhile to
consider.  Two options present themselves:

1) Alternatively measure E or Q clock signal frequency, which may not
require such precision, with the assumption that VSYNC always remains a
uniform fraction of primary clock speed (Is this strictly true?)
2) Develop a small cartridge based device that measures those signals, with
a small wire to attach to specific motherboard signal lines.  (Precisely
recording such signals requires what micro-controller clock frequency?)
Create a limited set of such devices and trade among the community over
time to create the dataset.

BH