CompuServe Messages

#Genlock and ntsc output

    19-Apr-88 22:27:52
Fm: Gregory Kozikowski 72770,3032
To: Mark Sloatman 74206,356
Dear Mark, et.al. (you remember Al?) In their supposidly infinite wisdom, Amiga chose to install the graphics chip that does NTSC output in the A1000 with a resistor across the two pins that determine modulation quadriture. As a result, if you chose to display your graphic on a "TV" or monitor that did the same thing, over half of the screen came out flesh tones. I'm doing this on line so the english doesn't always work. Let me hit that again. The resistor in the modulator circuit pushed the vectors in such a manor that many shades of red and yellow came out flesh tones. There are a LOT of TV's out there that do the same thing. By the time you sloshed through both of these errors, you had almost no "Q" modulation. EVERYTHING came out either flesh tone, or cyan. If you clip the resistor out of the circuit, (no further adjustments necessary) the vectors can be made to hit the 2% boxes of a vectorscope. The other problems I talked about are vid levels and chroma levels, both of which are off…but not THAT much. If you want to know more about that resistor, please do it via E-Mail and I'll be tickled pink (8B, 8G, 16R) to tell you all about it. It's in my files somewhere. Captain Video