A little over 40 years ago Chuck Peddle designed the MOS KIM-1 computer, a simple CPU trainer by today's standards though it is one of the iconic designs that started the home computer boom of the early 80s.

I've always wanted to own an MOS KIM-1, or Commodore KIM-1 as it was later rebranded when the as of yet somewhat unknown typewriter repair shop named Commodore called it. Even the first Apple-1 computer can trace it's roots back to it, but I've already built one of those in the form of the RC6502 Apple-1 Replica so I thought it was about time that I put those grey cells at work on the root of it all instead. The result is the computer I've designated RC-ONE, it isn't quite a SBC (Single-board computer) as it actually takes three boards to build (CPU, User Interface and a keypad) though all the parts should be easily obtainable today through sources like eBay and AliExpress.

This is the User Interface (UI) module, it slots on top of the CPU module and takes care of most things I/O in the system - prominent are the six 7-segment displays that the computer is so well known for, this is also where you plug in your keypad module via the use of a 2x8 pin JTAG cable.

For more information about this specific module, check out the documentation links for a complete list of parts and other information - see my other shared projects for the other required modules. There is also a manual that describes in more detail what a KIM-1 computer is, what the differences between it and my version is as well as some hints on how to use it.