Ms. Pac-Man started life as "Crazy Otto"-- an "enhancement pack" for Pac-Man that replaced the Z80 with a daughterboard. This daughter-board allowed the creator

Ms. Pac-Man started life as "Crazy Otto"-- an "enhancement pack" for Pac-Man that replaced the Z80 with a daughterboard. This daughter-board allowed the creators to selectively patch-out data and code from the original ROMs with their own. This was done to prevent needing to burn ROMs that might contain copyrighted code. There are some details about a recreation of Crazy Otto (where you can see some of the game graphics) here: http://www.pacificarcades.com/crazy-otto.html http://www.pacificarcades.com/crazy-otto.html Here's a photo of the daugherboard from Ms. Pac Man (which Crazy Otto begat): http://lawnmowerman.rotheblog.com/images/msaux.jpg http://lawnmowerman.rotheblog.com/images/msaux.jpg