Here is an the PCB for a simple Z80 board made by Thomas Scherrer
this project is born from a thread on comp.os.cpm, only small variations are done by me:

Added a connector for PIA signals and INT, NMI from CPU

Added a transitor to connect INTR from SIO to INT of CPU

The reset pushbutton is one of that are monted on CDROM readers, 6x6 mm , vertical mount

The PCB is NOW COMPLETE
Found a BUG in previus release , please use this version 1.1, 16c550 require an active high reset pulse
the PCB is available here to receive feedback from potential users: complete Bottom Top and Silk Images

blue tracks are on solder side ( BOTTOM )

red tracks are on component side ( TOP )

small tracks are 15 mils

fat tracks are 50 mils

vias are 50mils/15 mils ( pad/hole )

pads are 60/70/28 mils ( oval / hole )

most of track start from pads on solder side to facilitate mounting of socket on non metalized vias PCB

at this stage the PCB can be done by a fab , I don't know if is doable at home ( lack of experience )

Mounting holes are 3 mm in diameter good for screw , not good for plastic standing

On PCB:

P7 is the power supply connector ( 5 V regulated )

P6 is the parallel port expansione ( 8255 PIA )

P5 is the serial port ( TXD / RXD / DSR / DTR )

P1 is the reset push button

please send me your notes to this email address: m.colandrea@libero.it