Multisync Decay?
Tim,
If the brighness/contrast has been fading slowly, chances are that it's the
monitor or the monitor cable. It's not the AGNUS chip, since AGNUS only
moves the data around. DENISE or the video hybrid, or the Flicker Fixer
itself would be a more likely culprit if it really is the computer. Try
the monitor on the normal RGB connector. If you can easily try the monitor
on another computer, that could also be a good next step.
David