I was reading the coco entry on wikipedia just for fun, and I noticed it mentions upper and lower case at 32, 40, 64, and 80 columns.
64? Are there some peeks&pokes I’m unaware of that could shift basic into a 64 column mode? Just curious…
This post was submitted by sc.
That is certainly an error regards the ROM. The Coco3 does not support 64 column text.
You can possibly set the GIME for 64 characters in alpha mode but there is no code or text character images that could be used with this format.
You can try POKE-ing $FF98 and changing part of the ROM so that alternate values for text will be used. A very brief test gave a garbage screen with a checkerboard pattern.