[Coco] NTSC CoCo 3's Composite Video Signal

[Joel Ewy]

Mark Ormond's recent message about an SVGA LCD monitor that might work 
with the CoCo 3 reminded me that I have a little 5" NTSC-compatible LCD 
monitor designed for the Nintendo Gamecube that I got for the purpose of 
using with the CoCo 3 and other old machines.  It works OK, but with the 
CoCo 3 it has a problem where large areas of white on the screen will 
cause the picture to tear, and even with the brightness turned all the 
way down on the monitor the black level is too high.

Is it likely that the CoCo 3's composite video signal is at too high a 
level?  Would it make sense to put a resistor in there?

Even with the problems it has, I was able to run my 8-bit artifact color 
demo and confirm that the LCD does display the artifact colors, so at 
least some of the artifact effect is due to the NTSC encoding.  The 
colors do look better on a TV than on the LCD, but I would be interested 
to see if dimming the CoCo's video signal would improve things on the 
LCD.  It may also be that the RF modulation on the TV further blurs the 
colors together and makes them look more natural.

JCE