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

I bought a couple of different models of sync combiners / stabilizers but have not had time to play with them yet like the extron SC210. Anyone else try something like this and any success?

Best Regards,

Bill Karkula

email: wkarkula@comcast.net mobile: (847) 323-2366 home office: (708) 301-2998

-----Original Message-----
From: owner-rasterlist@vectorlist.org [mailto:owner-rasterlist@vectorlist.org] On Behalf Of Franklin Bowen
Sent: Friday, April 19, 2013 1:19 PM
To: rasterlist@vectorlist.org
Subject: Re: RASTER: Getting a stable picture on the Amiga 1084D monitor

Matt,

I would be interested in any solutions you find.

I use a 1084S and it can sync to maybe 2/3 of the boards I attach. I recapped the monitor and did find one cap had a bad solder joint but the recap didn't help with the 1/3 of boards that will not sync. I found a vertical sync pot on the chassis and moved that outside the monitor case but it has made very little difference in the boards I can sync to. Another 1084S seemed to have similar results, AFAIR.

I think the 1084 came in many different variations from different manufacturers as the schematics I have found online don't seem to match my monitor too well. This may explain the variety in results for arcade boards.

Franklin

on Apr 19, 2013, Matthew Rossiter <matt@rossiters.com> wrote:
>
>
>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
>>
>>
>> ---------------------------------------------------------------------
>> ------
>> ** Unsubscribe, subscribe, or view the archives at
>> http://www.vectorlist.org
>> ** Please direct other questions, comments, or problems to
>> chris@westnet.com
>>
>> ---------------------------------------------------------------------
>> ------
>> ** Unsubscribe, subscribe, or view the archives at
>> http://www.vectorlist.org
>> ** Please direct other questions, comments, or problems to
>> chris@westnet.com
>
>-----------------------------------------------------------------------
>----
>** Unsubscribe, subscribe, or view the archives at
>http://www.vectorlist.org
>** Please direct other questions, comments, or problems to
>chris@westnet.com
>
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3272 / Virus Database: 3162/6256 - Release Date: 04/19/13

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Fri Apr 19 14:34:51 2013