Code name : Z80fx2bb, real Z80@2MHz (instead of 4MHz) on fx2bb extension card.
[[http://www.youtube.com/watch?v=YYnvkR5v3D0 Video Z80fx2bb test 2http://www.youtube.com/watch?v=YYnvkR5v3D0]]
For it I plug all wires simply from 1 to 40. Some wires are cut, some are Vcc, others GND. Z80 output are directly connected, Z80 input are pull-up with red-red-red resistors (I like red), Z80 is powered 5v (pmod can give 5v using jumper). In fact z80 is so old component that powering it 5v do output 3.3v.