ProtoPad II is similar to ProtoPad One, but adds a central header connection that lines up with the programming pins on STRUIX CPU boards. This enables you to stack circuits directly on top of the CPU that use the serial port.
Like the Protopad One, it is a basic prototyping board with a traditional 0.1" (2.5mm) layout, but sacrifices some of the grid to accommodate the central header. Buss power is routed horizontally along the center from the +/- pads, while component connections are made along individual vertical paths.
Connections for all perimeter pads are available at the outside of the grid. Perimeter pad holes are set up for stacking with M3 hardware.