Alex Freed wrote:
js@cimmeri.com wrote:
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.
There is one difference--the S-Video luminance signal is not necessarily assumed to be band-limited, and it *is* assumed to not have a chroma subcarrier present. So it is often processed with wideband video processing, and could deliver much better than 3MHz video bandwidth for good 80-column text. It all depends on the monitor and its video processing. It is pretty easy to split composite for an S-Video input. There are adapters available in stores and construction articles on the web. -michael Parallel computing for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."