Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!wuarchive!wugate!uunet!sjsca4!news From: greg@bilbo (Greg Wageman) Newsgroups: comp.graphics Subject: Re: Inquiry about RGB-to-video adapters Message-ID: <1989Aug31.181140.3271@sj.ate.slb.com> Date: 31 Aug 89 18:11:40 GMT References: <9397@venera.isi.edu> Reply-To: greg@sj.ate.slb.com (Greg Wageman) Organization: Schlumberger ATE, San Jose, CA Lines: 49 In article <9397@venera.isi.edu> RAMO@AC.DAL.CA (Richard Outerbridge) writes: > > This message is from Richard Outerbridge of Dalhousie University > in Halifax, Nova Scotia, who has read-only access to news. > I'm only forwarding it, so please reply directly to him > by email if possible. The net address that's been working > from our own ARPANET mail service is RAMO@AC.DAL.CA. > > >I would like to be able to record some computer images on video tape for >later redisplay in a classroom setting. I have access to several video boards >at present all of which produce some form of analog RGB output, none of which >produce NTSC/composite color signals. I think what I need is either a low >cost converter from RGB to Composite, or a video card which has suitable video >out capabilities. I don't need particularly high resolution but lots of colours >would be very nice. > >I've already talked to lots of folks who think it ought to be do-able, but none >who actually know how. I've recently purchased an analog-RGB-to-composite-video converter for my Atari ST, for a similar purpose. The device is called the "Video Key", and is manufactured by Practical Solutions of Arizona. I suspect that this box could be used with non-Atari hardware, but you'd have to replace the Atari-compatible wierd 14-pin DIN connector with something more appropriate. The Video Key is designed mainly for use with the ST's low-resolution mode, which is 320x200. Hardware palette only provides 16 colors, but there are a number of software hacks that produce 512+ colors by reloading the hardware palette on the fly, and this device faithfully translates those displays. It works at the ST's medium resolution (640x200), but the resulting picture is not very sharp and exhibits some ringing (not terribly surprising). Best of all is the price, $100. If nothing else, this should demonstrate that what you seek is possible and has been done. I've heard of a Motorola part (14xx?) which is supposed to be able to do this conversion, but know nothing about it. You might ask on sci.electroncs and rec.video, as well. Greg Wageman DOMAIN: greg@sj.ate.slb.com Schlumberger Technologies UUCP: {uunet,decwrl,amdahl}!sjsca4!greg 1601 Technology Drive BIX: gwage San Jose, CA 95110-1397 CIS: 74016,352 (408) 437-5198 GEnie: G.WAGEMAN ------------------ Opinions expressed herein are solely the responsibility of the author.