Re: Apple II VGA video card and the IIgs

["Charlie" <charlieDOTd@verEYEzon.net>]

"Jorge Chamorro Bieling" <bieling@terra.es> wrote in message 
1hbguqc.9dzsg21ctea8gN%bieling@terra.es">news:1hbguqc.9dzsg21ctea8gN%bieling@terra.es...
> Hello,
>
> While the Apple IIgs Hardware Reference arrives from syndicomm...
> It's boiling in my head...
> Any possibilities for the VGA card to be apple IIgs compatible ??
>
> 1.- Any possibilities of "cloning" the IIgs memory from a slot ?
>
> 2.- I guess the memory map of the IIgs is linear, instead of composed of
> 64kb banks, so, can a slot guess the missing address lines somehow ?
>
> 3.- Where in the IIgs memory map, for the IIgs specific video modes, are
> located the pixel maps ?

The IIgs Super Hires mode pixel data resides at $2000 to $9CFF of the aux 
64K bank which if I'm not mistaken is both bank $01 and $E1 (one shadows the 
other).
Following the pixel data ($9D00 to $9DC7)are 200 scan line control bytes 
(one for each scan line). At $9E00 to $9FFF are the 16 color palettes.

Charlie