I ordered my 6-memristor PCB. $8 for 10. Plus about $25 shipping. No changes from the last post. 2 weeks to arrival.

I have been looking into the scaled version with an FPGA board. I figured if I had an 8-input ADC with each quad digital pot, I'll need 8 sets of these to get 32 memristors. Assuming the ADCs are SPI, then I'd need 5 I/O for each ADC/POT set. Each set would have a dedicated SPI interface. I want this for speed. Then I will need 40 I/O for all my chips. I ordered a Digilent Artix-7 module which has 44 I/O in anticipation of scaling the project up. And I still need to read up on the crossbar support circuitry. I may do 2 pairs per SPI bus if I need more I/O.

http://store.digilentinc.com/cmod-a7-breadboardable-artix-7-fpga-module/