Also, I opened the Maniac case, and instead of a TMS-1x00, there's a GI PIC1655A! I haven't decapped one of those before. The current PICs make ROM extraction difficult, but this one is so old I bet it can be visually dumped.
PIC1655's can be dumped electrically using a debug mode, kevtris knows details. PIC16C55 on the other hand is a whole different can of worms.
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"