JAMMA board video hookup

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. cheers Jules