[Coco] [HW] Coco 3 video output corrupt when using cart port
robert.gault at worldnet.att.net
Sat Feb 21 00:15:54 EST 2009
Brian Sturk wrote:
> On a black screen I can see hints of orange
> and blue. It's almost like random repainting of the screen *and* the
> magnetic field effect. Definitely weird.
> thanks for the help, I'll report back,
As Tim suggested, re-seating all socketed chips is a good idea even if
it does not help with this problem. Tandy did not use gold plated
contacts so a fresh surface can't hurt and could help.
The orange and blue, is that fringing around text with a 40 or 80 column
screen? If so, it is artifact colors typical of composite video. Some
screen colors will make the effect worse than others. There is only one
way to get rid of it completely and that is by patching Basic.
If this is the source of your colors, I'd suggest using a 40 column
screen with a white background and black letters. Enter
If the orange and blue is artifacts and you get a disk system to make it
easy to SAVE and RUN programs, the following will turn off the color
burst signal and remove artifacts.
10 POKE&HE033,16:REM width 32 screen
20 POKE&HE03C,19:REM width 40 screen
30 POKE&HE045,19:REM width 80 screen
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