I built a MAME arcade about 6-7 years ago and really wanted lightgun support. Took me a long time then to find a good 27" tube that had s-video input to get a decent resolution for it. I had to take the tv apart to get it to fit inside the cabinet, but the end result with a bezel is it looks awesome and just like an arcade.

The guncon2's were the only ones i could find that worked and some random person had built a driver for windows xp. However i Still have to manually built a power circuit to power the gun from the computer power. Took a lot of time and effort but the end result was very nice and it's always a blast to fire up the arcade and some some gun games.

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Buddy of mine built his MAME box using a LCD and one of the newer light gun assemblies, it never worked as well as mine with the CRT and wasn't as accurate.

Just my .02, but none of the new stuff plays the same as the old guns with the old tubes.

I don't even know how many gun games i have... i have like 5,000 arcade games, but then i have pretty much every other system out there running as well. Even all the HOTD variants are working through the appropriate emulators. It's fun, although I feel like Area 51 gets the most play of anything.

I'll have to check out PB PSX version, only have played the arcade versions on mine.