This runs on the same hardware as Qix. It's a ROM swap for Qix, but they added a "coin processor" board to prevent people from converting Qix boards to run it. I made a patch to the program ROMs to get the game running without the coin processor since I had so much trouble getting several Zookeeper machines running because of the stupid thing. You can get the patched code from my "random info" page.
It wasn't working when I got it. Someone had wired in a switching power supply and soldered the new wires directly onto the pins of the PCB without using a connector and the reset wire had come lose. I undid that mess and put in a proper harness. I also replaced the horrid board-eating battery with a NVRAM board designed by Mark Spaeth.