[Coco] Questions on CoCo 3 graphics

[jdaggett at gate.net]

On 20 Jan 2008 at 20:20, Mike Pepe wrote:

> > 1. First off - does anyone know if it is possible to have more than
> > one 320x200x16 color screen in memory on a 128K CoCo 3? I assume
> > that such a thing would be easily possible on a 512K or higher
> > machine.
> 
> Yes- each screen takes up 32k. You could in theory have 3 such screens
> and 32k left for code.

You have only one contiguous block of 32K in a 128K machine designated for high 
resolution graphics. By overwritting the high resolution text area, you can gain a second 
32K block. That would be it on a 128K machine. I would not advise usign a third 32K blcok 
as y ou will either overwrite BASIC or the direct page variables. In either case this will yield 
in a power on reset. 

james