[Coco] Re: CoCo Monitor

[Robert Gault]

Actually that was not a good example. What I should have said was:
run
10 PMODE3,1:PCLS2
20 PMODE4,1:SCREEN1,1
30 GOTO30

In a PMODE3 screen, PCLS2 will fill the screen automatically with every 
other vertical line. Then changing the mode to PMODE4 on an RGB monitor 
would show alternating black and white vertical lines but on a composite 
monitor will show either all red or all blue artifact color.