reZet80 CPU card R2

This is the R2 update for the reZet80 CPU card.
Please check also the reZet80 CPU bus specs R2.

Bill of materials:
- reZet80 CPU R2 PCB
- 40-pin right-angled male connector
- DIP-40 socket (or ZIF-40 socket in order to easily exchange CPUs, optional)
- DIP-8 or DIP-14 socket (depending on oscillator size, optional)
- Z80 CPU (NMOS or CMOS, NMOS for the reZet80 PIONEER)
- oscillator (DIP-8 or DIP-14, 2 MHz for the reZet80 PIONEER)
- 6x resistor 4k7 (or 10k)
- 3x capacitor 100 nF
- 8x jumper wire (optional)