Friend of mine pasted this on to me. Looks pretty interesting on a z80 mod to add a high score save and even Ethernet.
http://hackaday.com/2011/05/27/adding-persistent-memory-and-ethernet-to-vintage-arcade-machines/
http://hackaday.com/2011/05/27/adding-persistent-memory-and-ethernet-to-vintage-arcade-machines/

