I did cut a piece of stripe hole board and soldered pin plugs in. This is a bus board to connect the expansion ports of up to 4 Propeller One boards. There are ten data lines. I soldered two connectors in to do a test. The jumper switches the 3.3 volt power output to the other boards. So at least in theory only the master board needs a power supply.

I have to write a program now which makes use of the bus board...