[Coco] More colors on CoCo 1?

[Joel Ewy]

Ok, this may be just wild speculation.  But couldn't one write a program
that would flip between 2 9-color SG-24 screens to make a 64x192
high(er)-color display on a CoCo 1 or 2?  Not that I'm seriously
thinking of attempting such a thing.  It would take up 12K of RAM, but
that in itself shouldn't be a show stopper on a 64K machine.  Resolution
would be quite low, and the elongated pixels would be weird.  But I
wonder if you could almost get a recognizable image by time-domain
dithering the colors.

Another question is whether the screens would even have to be in the
same graphics mode.  Could one superimpose a 256x192 2-color bitmap over
an SG-24 colorizer?  Or two?  That would require 18K.  Why would this
not work?

JCE