[Coco] black and white Coco games on Coco3

[James Igou]

Yes, some older games rely on false colors (blue and red).
These are generated by a television display due to artifacting.
The NSTC signal was poorly designed. 
Fine white lines often appear blue or red.

In order to see these on a Coco3, you would need to use a television display.
Not a monitor.

A prime example of this programing technique is the tom Mix game Sailor Man.
A Popeye copy, its display (on a television) is in blue and red.