Hi,
Do a search on: Gonbes GBS8200 CGA/EGA/YUV/RGB to VGA. Don't forget to buy small power supply for this card.
It's an easy way to connect an Arcade board video output to a VGA (PC) monitor.
There are other solutions available, but this one is affordable.
You'll need some soldering or go between for the JAMMA connector to connect the RGB-HV.