Getting a stable picture on the Amiga 1084D monitor

I use an Amiga 1084D monitor for testing. I also use an RGB converter
hooked up to a flat panel computer monitor, which works great but if
there's a problem with the video signal that I'm trying to troubleshoot
it much easier to see the problem on an old school monitor.

The problem with the Amiga is that it's hard to get a steady picture on
many games. Atari boards are usually rock solid. After about 30
minutes of warm up time the picture will finally hold.

Does anyone have a solution to resolve this problem already?

I'm not an expert by any stretch of the imagination but here's what I
thought.

I'm testing a Warp-Warp board (for example) and it's sending out a sync
signal about 15.5 kHz, which might be slightly higher than what the
monitor expects. I'm thinking of making a simple astable circuit using
a 555 timer with a 90% duty cycle, negative sync pulse, and with a
potentiometer to adjust the frequency slightly and just use that as the
RGB sync. Then maybe add an inverter for games that use a positive sync
pulse?

I have some other ideas, but just thought I'd throw this out there.

Matt

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Received on Thu Apr 18 14:23:46 2013