These are the new "3 in 1" JAMMA boards as reported on the rec.games.video.arcade.collecting newsgroup. I just finished building two of these full sized games. These are JAMMA boards with 3 popular vertical games in them. They have a hard dip switch setting to use either a standard CGA resolution monitor or a VGA monitor. Game play is the same as the originals but on new hardware. That price on that auction is a good one since the 3 in 1 board sells for around $350 and you figure the monitor is $250. Then you add in the price of the cabinet and power supply. I say it's a bargain.
I've been playing the two game cabinets with these boards for several days now and they've run just fine. I like them and these two games will be going on the route next week!