Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!jarthur!nntp-server.caltech.edu!gah From: gah@hood.hood.caltech.edu (Glen Herrmannsfeldt) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Color TV's and Composite Monitors...HUH? Message-ID: Date: 17 Apr 91 01:45:49 GMT References: <1991Apr16.161808.2605@milton.u.washington.edu> Sender: news@nntp-server.caltech.edu Distribution: na Organization: California Institute of Technology, Pasadena Lines: 18 Composite video and monitors.... THe timing characteristics of CGA are essentially the same as those of a regular TV set. They are supplied as separate RGB, and as composite video. The scan rates are the same. The CGA manages to make color in composite video by having the dot rate be 4 times the color subcarrier frequency. 4 times 3.579545 MHz = 14.31818, sounds familiar? This way, certain dots come out certain colors. Now, you also need a signal, called the burst, that tells a color TV that it is a color signal. The CGA will optionally make this. This is probably what you can turn on and off. I don't know if EGA and VGA in CGA mode can do this.