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D.I.Y. JAMMA adapter - cool idea and a question
Akuma:
Hello everyone. I just got the idea to look at a certain tech-geek site called gamesx.com which I have been browsing over a year ago. Now, looking at everything at a new, home arcade cabinet usage point of view, I found something I didn't read last time which seems to me like an awsome idea which is almost screaming to get used in my cab.
Check out this link: http://www.gamesx.com/arcade/cheapjamma.htm
A self made Jamma adapter. It's vice versa from the PC2Jamma thing. Now there is only something I wonder about: Doesnt't a Jamma board put out the video in 5V RGB? Not to mention the 15 kHZ. So, can you safely plug this to a 15 kHz sync-able monitor? Or do you need to solder any resistors or something in, to get it down to 75 ohm? Might be a stupid question, but I am only an amateur electronic engineer ; )
I know, this might be better suited for the monitor forum, but I thought the adapter might be suitable for many fellow forum members that frequent the main forum more than the video forum.
Stobe:
That is a very simplistic design. You may want to add some pots to the RGB lines to give you some manual control on the levels. You did take notice of his intent to use a RGB to VGA converter, which in some cases does have adjustments for sync and RGB.
-Stobe
Akuma:
ah, I've seen now - so this would regulate the 5v 15kHz to low volt 31 khz?
SavannahLion:
--- Quote from: Akuma on November 13, 2007, 03:51:04 pm ---ah, I've seen now - so this would regulate the 5v 15kHz to low volt 31 khz?
--- End quote ---
No. It would drop the 5v to 1.5v (IIRC), but it would do nothing to change the frequency. To do that, you would need to find yourself a scan doubler or something similar. Given the cost of an RGB 15KHz to VGA 31KHz converter, it would negate the whole concept of "cheap".
Akuma:
I see, I see... Since I live in europe a TV is also an alternative because of the RGB-scart connector's compatibility. I just have not figured out yet, how a MAK / Supergun modifies the RGB signal from 5v to 1.5 volt...
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