JAMMA board video hookup

Jules Richardson jules.richardson99 at gmail.com
Sun Oct 18 10:32:54 CDT 2015

OK, so it's sort-of computery. I snagged a JAMMA arcade board from a 
recycling pile a couple of days ago (this is an m68k-based early 90's 
board). Supposedly it's faulty, but I don't know the nature of the fault - 
maybe it's just RAM or a reset problem or something, so I figured I'd put a 
little bit of time into it.

Anyway, I'm having a hard time finding details about the video output - I 
know it's negative composite sync (I got the manual, which says that much), 
and I *think* it's TTL levels (right?), but I'm not sure about frequencies. 
Then there's the RGB outputs - analog, but I'm not seeing anything that 
tells me peak voltages.

I suppose the question is, what's the easiest display to try and hook this 
up to? I've monitors with an assortment of inputs (VGA, EGA, CGA, MDA, 
mono-composite), and I think there's a CRT TV kicking around that has a 
composite input too (and maybe S-video, not sure).  It doesn't bother me if 
the quality's not great; I'm just interested in whatever's quickest to 
interface to at this stage, just to see if I can get something working.



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