David Wilson wrote:
I know that the color on mine is only so-so (when compared to the NTSC on my MPF-III (a IIe clone)). I wonder if the trimpots near the 4.43MHz crystal need tweaking.
Just set the screen to all black (lores or hires, not text mode) and turn the pots until the screen is not tinted any more.
You can also try adjusting trimmable cap. It mainly controls the amout of moire you get. In truth you always get fairly strong moire from this motherboard, but with the pot you can get it to move so fast as to be almost invisible -- I can still catch it in the corner of my eye but not if I look straight onto the screen.
But of course if this cap is heavily deadjusted, colors will be bad as well.All the Euroapples that use this kind of PAL encoder have the property that the color signal is only changed once every four double-hires pixels (or once every two hires pixels). This can sometimes mess up vertical edges a bit, as it's not a true "sliding window" implementation.
-- Linards Ticmanis