Well, first you should find some faqs and info on video standards and read them. Here are a few basics. RGB is not a single type of video. It just means separate color outputs. It is generally divided into analog and digital. VGA is an example of analog, CGA is an example of digital. There are other kinds of analog and digital as well. Some analog RGB use scan rates much lower than VGA, but are otherwise similar. This is the case with Amiga RGB, for example. In that case, scan doublers are available to convert the video to VGA. To know the answer to your question, you have to identify exactly what type of video output you have. Then, whether and how it could be converted can be addressed. Generally, the best solution is to get the right kind of monitor for the video you have. There are some monitors that can handle many types of video, and these are very useful for old computer enthusiasts. Louis On Wed, 7 Feb 2001 14:04:24 -0500, Rich Beaudry wrote:

I'll bet you do have an RGB monitor, unless it's monochrome or composite-input. Before I can answer your questions, I have to ask a few of my own. First of all, what, EXACTLY, do you mean by "RGB monitor?" The only popular video cards I've seen made after about 1982 all had R, G, and B outputs, along with a couple of sync signals. The PC "color" board had compisite outputs as well, but R, G, and B were there. RGB is not a standard. In fact, it's not even a slightly adequate description of a monitor, since the only ones other than composite-input types that are out there in quantity are monochrome. Let's face it, if you want color to appear on your screen, you've got to send its constituents into the monitor somehow. The signals that need to flow into the typical monitor are red, green, blue, H-sync, and V-sync. There are several ways of getting them there, ranging applications, to the wierd hookups used by workstation manufacturers afraid you might hook up the wrong devices and break something. How hard it is to build an appropriate adapter depends on what the monitor expects to see as its driving signals, both in terms of frequency, and in terms of polarity. If you have a fixed frequency monitor made for something other than your application, I advise you to BEG someone to take it away. Either that or just toss it, because at 50 cents an hour, you probably can't make it work with a year's pay. A nice new, beautiful and bright monitor in the 10" range costs <$300. You'll spend that much on aspirin, Malox, and prune juice, and maybe on whisky as well. If you feed each sync output from your video adapter through an XOR gate with a switch to ground attached to a pullup to Vcc at one input and the sync at the other, that will handily switch the sync polarity easily enough. If your frequency is wrong, plan to expend about 10 man-years rewriting the ROM on your video adapter to produce the right frequency. You can probably program the sync polarity that way as well. If you're wanting to impose sync on green, that's pretty straightforward and I can provide you with a schematic that uses a 5-transistor array to do the entire job very well. It won't fix frequency problems, though. Let me know what sort of monitor and adapter you're trying to mate up and perhaps I can help you. Dick ----- Original Message ----- From: "Rich Beaudry" &lt;r_beaudry(a)hotmail.com&gt; To: &lt;classiccmp(a)classiccmp.org&gt; Sent: Wednesday, February 07, 2001 12:04 PM Subject: RGB-VGA Converter -- buy or build? computer's