[Coco] Update on new Coco 3 game engine

[Nick Marentes]

Congratulations Richard. You've nailed it.

Everything you said is totally correct and your logic and understanding 
of the CoCo's capabilities and limitations is spot on.

I am up to the same exact point with my Popstar Pilot game engine. And 
you're absolutely right about the challenges you clearly outlined.

I will soon be posting a new chapter about this very topic on my blog 
since I too have just created the sound routine which is being triggered 
off the FIRQ with interrupts sourced from the TIMER which is itself 
derived from the 15.734Khz clock and divided by 2 to give a maximum 
audio fidelity of 7.867Khz.

I now need to run optimizations on my code to make it chew up the least 
amount of cpu cycles while still managing the split screen horizontal 
scrolling and 2 channel sound sample playback.

If the CoCo only had a sound chip built in as standard!   :)

I look forward to your upcoming game whatever that may end up being.

Nick Marentes