The terminal for Sega's "Bingo Circus" was dumped last year. I've made it mostly work:
You can see the attract mode and use the service mode. However when you insert coins it tells you to wait for the game to start - here it wants to communicate with the host. In reality there are 8 terminals attached to the host system. Not an issue for MAME of course:
The machine info looks cool with 17 Z80 CPUs and more :P
Here's a picture of the full unit: https://segaretro.org/File:BingoCircus_Arcade_Cabinet.jpg