I recently purchase a Clone Space Invaders Cocktail Cabinet by a Company called Jatre. The cabinet is c1980 and ran a cone of SI called Jatre Specter. Anyway, I was hoping to restore it to its former glory, but the unique hardware and lack of replacement parts probably means I will have to empty the cabinet and start from scratch.

PC Hardware for a full MAME based machine is probably over the top, as I only want to run Space Invaders on this unit (I already have a full MAME based machine).
What other hardware/software platforms have been used to just run Space Invaders (or similar) on? Am I better off sticking with basic PC based hardware (eg, 486/Pentium 1) and a M$ Windows based MAME, or maybe a DOS based emulator? I understand sound can be difficult to set up correctly with DOS emulators.
What hardware/software are others using for single game machines? Any feedback on DOS emulators?