Connecting VGA-cards to TV?

stein asks: "Is it possible to connect a gfx card without a special TV-out to a TV? I was thinking of making a VGA-to-Scart cable and program the gfx hardware to TV compatible frequencies. (Scart is a standard I/O connector found on most modern TV-sets, has audio/CVBS/RGB inputs/outputs). Programming the HW should be easy using XFree86 under some UNIX system. And off course I wan't to do it on a PC. I have a Riva TNT board. So has anyone done this?"