js@cimmeri.com wrote:
I think what gives pause, Tim, is that the end results are of dubious value. As Michael points out, the Apple II graphics stuff was optimized for composite, and from several opinions, appear to look best on composite.
I'm not so sure. A number of existing emulators look quite good.Take a look at my FPGApple site - the "karateka" picture is an example of how it looks on a VGA screen.
Mono is a no-brainer. So is the lo-res. It's the hi-res color graphics that is not so trivial. For example a part of the screen that has "solid color" in fact has every OTHER pixel on (normal hi-res mode on 2e). So should the VGA display a real solid color or (as I did) have odd pixels turned off?
I don't know if S-video can produce legible 80col text, but perhaps another way to go is to figure out how to perform surgery on the II's to produce s-video composite output.
S-video is only different from composit video in one respect - the color information comes on a different wire than the luminance. The way video is generated in apple 2, they are inherently mixed. So it doesn't matter much if you try to separate them at the computer side rather than inside the TV. A modern TV will likely do a better job with a comb filter. -Alex.