[Coco] What do you make of this non-approved HSCREEN mode?

[Torsten Dittel]

I guess analysing the discrete CoCo3 prototype would reveal which modes 
are fully implemented and which not and explain the one or the other 
"strange" behavior.

However, I'm still astonished, that this is the first time after more 
than 20 years someone is more or less systematically trying out all bit 
combinations of the GIME registers and describing the way bit patterns 
in memory are displayed on the screen. Makes me once more sigh at not 
having access to a CoCo3 here in Germany in these times. Now I have some 
PAL machines from Down Under boxed, but absolutely no time to dive into 
that maiden-like water... ;-)