Its pretty cool that they are using a CPU that came out in 1974 and is still in production, and it happens to be a Zilog Z80. I'm sure the chip isn't nearly as big as it was then. But anyway, it is fairly interesting.

http://www.zilog.com/

Original 1974 specs:
Form: 40-pin DIP
Design: Zilog
Manufacture: Zilog
Introduction: July 1976
NPU: external
Internal clock/External clock: 2.5-12MHz
L1 cache: none
Width: 8-bit with 16-bit elements
Transistor count: About 6000

Current generation of Z-80 CPU's run anywhere from 4MHz to 20MHz