[Coco] Semigraphics modes examples

[Stephen Robinson]

Hello all,

Long time lurker here. I am a latecomer to the Coco scene. They had
been out of production for a long time by when I got my start. When I
was a pre-teen back in 2005-ish, my father gave me a Coco 2, some
cassette tapes, a stack of old Rainbow magazines, and a pocket
reference guide. I managed to hook it to our TV by taping some wires
together. And after typing in:

10 PRINT "HI"
20 GOTO 10
RUN

I was hooked! End result: I learned to program from Rainbow magazines,
asked my father for more Coco stuff, and have gone one to study and
get a job in Computer Science.

I don't really have much time at all for Coco's anymore (sadly). But
there was one especially large lingering question in my mind. What
were the semigraphics modes? I heard much about them in the Rainbow
magazines. How the Coco 3 didn't support them (all). How the size of
them was odd. Etc.. But never could I find an example to run.

So, if nothing more than to finally solve this childhood mystery, is
there some reference which I could see to finally explain these
magical text graphics modes to me?

Thanks,
Stephen