PC2JAMMA

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Simple enough, requires no hardware whatsoever.
It's easy to get MAME running on an arcade monitor - simply run MAME with the -monitor arcade option.

The front end (ArcadeOS.EXE) also allows other emulators without a -NTSC option to be connected directly to an arcade monitor.

It does this by reprogramming the VGA timing registers to match a standard res arcade monitor.
Check out the video cards page for more info
 

All you need to do is wire the correct output from the VGA port to the correct pin on the JAMMA fingerboard
The standard 15pin VGA pinout is as follows (looking at the connector on your VGA card)

VGA Connector PinOut

1 - Red
2 - Green
3 - Blue
4 - Monitor ID *
5 - Ground
6 - Red Ground
7 - Green Ground
8 - Blue Ground
9 - Keyway (No pin)
10 - Sync Ground
11 - Monitor ID *
12 - Monitor ID *
13 - Horizontal Sync
14 - Verical Sync
15 - Monitor ID *
 
You can ignore all the pins marked *, as we won't be using them. Don't forget to wire in all the grounds, wire the first one to Video Ground on the JAMMA fingerboard, then solder a short wire from this across to one of the Ground pins on the fingerboard. This just makes sure all your grounds are common.

As for getting composite sync from separate horizontal and vertical sync (which is what VGA puts out), you should run them through and XOR gate (7486) but I cheat - and just twist the wires together.

 

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