IceMan wrote:
I have been able to get my VGA adapter to display "PAL" instead of
"SECAM" by tweaking the varicap on the motherboard (color synch). However,
this did not change the colors: green and red seem to be nowhere while blue
and brown are present.
Have you tried turning the two pots as well? They're responsible for the color balance.
If that doesn't work, maybe there's some problem with the Apple's internal converter curcuitry that reads the pseudo-NTSC output from the standard Apple circuits and turns it into PAL. You might want to check the 74LS1164 at UC14, the 74LS175 at UA15 and the TCA650 at UA13.
I have an old CRT PAL monitor, which I used with my Amiga 500 - it has a
standard SCART input. I will solder on an RCA so I can use the Composite IN
(the SCART cable for the Amiga only uses RGB and H/Vsync) and see if that
monitor will yield the correct colors - I guess that's the best I can try
for now.
At least this will show you if the problem is in the Apple or in the converter. BTW I think there are cheap little pluggable adapters for RCA to SCART.
-- Linards Ticmanis