If you want to play on a 15 hz monitor why not use an old found working pc. Rip the guts out of the case. Mount neatly inside your machine. A Pentium 4 with a 200gb drive running a cracked version of windows, 2 Gb of cheap ram, an Arcade VGA and a j-pac or i-pac and a cheap set of speakers will run pretty much any arcade game that you want on an old arcade machine. Buy a new machine for cruising the net, 3D games and 3D rendering or something. Just stick some cheap ex office PC that you found at the dump in your arcade machine. It will save you cash that you could donate to Smittdogg or Guru or Dr.Decapitator to buy, dump and emulate some new games in MAME. (or even get a life!) Even a Pentium 4 running 2Gb hiding away in an dusty old arcade machine running a 15 hz monitor is overkill. What did you want to play?