[Coco] Blast from the past!

[Arthur Flexser]

> On 31 Jan 2008 at 8:20, theother_bob wrote:
> 
> > There was never any ROM code that supported the semigraphics modes
> > below PMODE levels. That was a hardware feature of the 6847 that was
> > not implemented in the GIME.
> > 
> > Bob

Nitpick mode on:

There's no PMODE for semigraphics, which uses the text screen rather than the
graphics one.  Semigraphics-4 is supported in BASIC in the form of the SET/RESET
commands.  Even the possibility of using Semigraphics-6 (which never worked
right, and therefore was never used for any commercial programs) was eliminated
by substituting real lowercase for this mode in the later CoCo 2s and the CoCo
3.  That is, the poke that on the CoCo 1 and early CoCo 2 that would bring in
Semigraphics-6 became the one to enable real lowercase.

Art