Composite to cga (r/g/b/grd/sync) converter?

ChaosJohn

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I can find lots of converters to convert the output of an arcade game to a composite signal. Does anyone know of a converter that can go the opposite direction? In other words, it could take a composite video signal as input and convert it to red-green-blue-ground-sync 15 Khz signal?
 
Or as a followup...

Does anyone know of an HDMI to CGA converter? I guess I could go HDMI to VGA, then VGA to CGA to do this.

To let you know the application - I'm trying to figure out if I can convert my MAME cabinet over to using a Raspberry Pi for it's computer instead of a Windows machine. Raspberry Pi has no VGA output - only HDMI and composite. So the first step is going to be getting the video converted to something that can display on an arcade monitor.
 
I can find lots of converters to convert the output of an arcade game to a composite signal. Does anyone know of a converter that can go the opposite direction? In other words, it could take a composite video signal as input and convert it to red-green-blue-ground-sync 15 Khz signal?

Alva Amusement model CV-03 board will do what you want.

http://alvaamusement.com/id4.html
 
I have one of those laserdisk coverters from composite to RGB...

If you want it, PM me your address and I'll ship when I get back home.
 
Converting from HDMI will get you a better image. Composite is absolutely terrible, and it'll be interlaced from the Raspberry Pi as well.
 
Awesome. Thanks for all your replies. I've already ordered the stuff to convert from HDMI (it's a two step process), so I'll try that first. But if that doesn't fly, I'll come back and try one of the things suggested here to deal with the composite to arcade conversion.
 
Sorry to resurrect a months-dead thread, but I was wondering how this might have turned out?

I found out about the ODROID X2 which is apparently trying to compete with RPi. It's a little more expensive, but quite a bit more powerful. I'm considering using one of these to toss into a JAMMA cab I have.

I'd like to do as little modification to my cab as possible as there are still a few actual boards I want to be able to run, which means no hacky hacky into the cab's guts.
 
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