RC6502 Apple 1 Replica Backplane module revision A PCB This is a backplane module, this will allow you to connect more modules together with the SBC to add more functionality. The design of this is generic and you'll be able to use this together with all of your vintage computer modules, great to have around as a basis for your own projects as well! *) This is PCB only, you can order the aditional components seperatly in this webshop, if you need them. rc6502bus This is the pin description of the RC6502 bus: https://github.com/tebl/RC6502-Apple-1-Replica/blob/master/Bus.md This is the project page: https://github.com/tebl/RC6502-Apple-1-Replica The page about his board in this website: https://www.heinpragt.nl/?p=661