Re: Getting a stable picture on the Amiga 1084D monitor

Thanks, yeah, maybe it's time for a cap kit. I did build a little
circuit that gave me a perfect 15Khz signal just like the game board but
the picture was worse so I scraped the idea. I tried with a 90% duty
cycle and then 75% but it just wouldn't sync.

Matt

On 4/18/2013 9:36 PM, David Shoemaker wrote:
> I use a 1084 (non D) on my bench. It has the DB9 input.
>
> It syncs to most everything I throw at it without any real issue. Only down
> side is it can't do mid res games (for that I have a Nec Multisync 3D)
>
> Maybe you need to cap kit it? With the warm up time that is the first thing
> I would look at.
>
> David
>
> -----Original Message-----
> From: owner-rasterlist@vectorlist.org
> [mailto:owner-rasterlist@vectorlist.org] On Behalf Of Matthew Rossiter
> Sent: Thursday, April 18, 2013 11:23 AM
> To: rasterlist@vectorlist.org
> Subject: RASTER: 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 Fri Apr 19 12:49:20 2013