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Re: IIgs Double HIRES



On 2/12/2012 5:00 PM, Daniel Kruszyna wrote:
Hello All,

Has anyone documented the method that the IIgs uses to determine
color in double hires mode? A search of the archives brings up
some discussion, but not any findings...

-- Daniel

The Apple IIgs Hardware Reference gives a small amount of information less than a page and half including the usual table for figuring the color pattern. A more in-depth description is in the Apple IIe technote #3 (revised in 1988 to include the IIgs). Having said this I would like to hear of something better myself as I have struggled to understand the double hires mode.

Charlie