ZX80/81 Expansion connector

I'm on a bit of an 8-bit nostalgia kick these days so I chose to re-implement the Sinclair ZX-80/81 using an fpga (I'm certainly not the first to do this - I'm still learning). I split out the designs for the expansion connector and power-supply to allow for greater modularity and better use of pcb space. As usual, the pcbs from PCBWay were made and delivered very quickly and are of very high quality.