[Coco] A pretty good read about speeding up the draw routine on a 6809 based game - 8 years old!

[John Guin]

This older blog article bubbled up today and was a good read.

https://blog.moertel.com/posts/2013-12-14-great-old-timey-game-programming-hack.html

320x240 screen res implied Coco3, and he verifies that was the machine in question in the comments.  (And guess who figured out it was a Coco3?)