-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 In article <9G5ja.33187$7Im.15777@news04.bloor.is.net.cable.rogers.com>, Glenn Jones wrote: >"Volkmar Friauf" wrote in message >news:b6hisl$5a4p8$1@ID-60882.news.dfncis.de... >> recently, picture quality of my IIgs Color monitor is degrading rapidly, >> so I've been looking for an alternative. Since I have a fine VGA display >> for my PC, I am looking for a way how to use that display with my IIgs >> (possibly with a monitor switch so I easily switch between IIgs and PC). > >Slightly off topic .... > >I have a laptop that has s-video in and s-video out.. It also came with a >s-video to composite conversion cable. > >I thought what the hay... so I conected up the cable...fired up MGI >Videowave and there in the preview window on the LCD screen was the IIGS >display. > >Monochrome looks great .... colour on the other hand was pretty bad... by >toning down the brightness and colour level I could make the Desktop useable >but with very little colour. If there's a way to extract S-video from a IIGS, that might be doable. I don't have a schematic for it, but somewhere in the process of converting analog RGB video to composite video, the Y and C signals that are mashed together to form a composite signal must be present. Start with the four signals on the RGB connector: red, green, blue, and composite sync. First, the video hardware converts RGB to YCbCr. If you mix Y with sync, you could take these three signals and get the same component video that your DVD player produces. Combine Cb and Cr and you get C, which is one of the two signals in an S-video connection (the previously-mentioned Y/sync combo is the other signal). Combine the two S-video signals together and you get composite video. I don't have a IIGS schematic, but if these signals are available at some point where they can be tapped off and run to a connector, you could get S-video to your other computer's TV-in jack; this would be of much better quality than composite video. Another option (probably easier than hacking at the motherboard) would be to build something that plugged into the RGB output jack and provided component and S-video outputs. If somebody makes a 13" TV with component and/or S-video input, this could be a suitable monitor replacement. (Component would be best, but S-video should be pretty good...when I switched my TiVo from composite to S-video, I saw a big improvement in the clarity of its menus.) (FWIW, there's already a product on the market (the Video Turtle) that converts RGB to S-video. At $150 (according to the information I found), it's still fairly spendy.) _/_ Scott Alfter / v \ salfter@salfter.dyndns.org (IIGS( http://alfter.us Top-posting! \_^_/ pkill -9 /bin/laden >What is the most annoying thing on Usenet? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (Linux) Comment: For info see http://www.gnupg.org iD8DBQE+jSGHVgTKos01OwkRAsVQAKDIke8kkO216FRKUXAUJjhRGWwQVgCg7P4R 2lTRtfA3s6rB/XN17W4FR6o= =qDzO -----END PGP SIGNATURE-----