The processor on the my PE+ board is an Intel 80c32. It pre-dates the 8051/8052, which is a more common version of the chip.
I used a program called DIS8051 to disassemble the game code and it appears to be unprotected. I found that strange for a system that is used for gambling, but was quite happy to see it!
Time to dig into the code and see if I can start mapping interesting things. I'm using 8052.com as a reference site. They have a ton of information on this processor. Once I get comfortable with the code, I will begin creating a driver in MAME.