[Coco] More colors on CoCo 1?

[Torsten Dittel]

> Nifty!
> 
> It shows all 9 colours on screen, both 256x192*2 and 128x192*4 modes at the
> same time and a couple of (moving) black lines in the border too.

Great, it seems to be still running :-). AFAIR (but my memory is quite
weak ;-)) it even shows all 10 colors ("dark orange", the "inverted"
orange text color too). And there's some really smooth horizontal and
vertical scrolling too.