#Genlock and ntsc output
19-Apr-88 22:27:52
Sb: #119716-#Genlock and ntsc output
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