D9200 CGA <-> VGA switching

[ignignot]

So I just got a cab with a D9200 (Buck Hunter II) and I reaallllllyyyy want to use the monitor as a tri sync with EGA, CGA, and VGA inputs that can be switched "on the fly"


I am seeing though, that if I want to switch from CGA/EGA <-> VGA I need to physically unplug some jumpers in the chassis and switch them around. Is this true? I haven't tried hooking up a VGA source yet, because I don't want to overscan or break something or whatever.

I'm trying to hook up

a NAOMI using VGA
a EGA JAMMA board (Buck Hunter II)
a CGA JAMMA board (Lethal Enforcers)

anyone know of a good way to switch through the 3 different modes without having to open the cabinet?

[grantspain]

its one connector on the signal breakout board that needs to be moved,its on the wg website
pretty sure all it does is add/remove resistors on the rgb lines

[MonMotha]

Bingo.

It actually has nothing whatsoever to do with the resolution, only the video signal levels.

Most CGA/EGA (standard res/medium res) arcade games output ~3Vpp video signals, whereas most VGA games output 0.7Vpp (also used by PCs and commercial broadcast equipment) signals.  Moving the connector changes some resistive dividers around to account for this difference.

Not really detailed in the documentation is that, should you want to run CGA but from a PC source, for example, you actually want this connector on the "VGA" setting, since you're supply 0.7Vpp signals just with CGA resolution.  This comes up when people use emulators on PCs.

If you are, in fact, using different hardware, you probably do need to actually account for this.  You can do it separately from the monitor, though.  A resistor between your source and the monitor on the RGB video lines of about 220Ω for your CGA and EGA sources (but not your VGA sources) should do the trick.  I presume you are using a video switcher or something?