Nibbler: Another 7400 4-bit custom CPU

Posted on Wednesday, August 28th, 2013 in project logs by DP


Steve at Big Mess o’ Wires writes:

I know the Open 7400 Contest is long past, but I wanted to call out a new 7400-based custom CPU I’m building. It’s a 4 bit CPU called “Nibbler”, and more info is on my web site here
My goals are to keep the chip count to an absolute minimum, while still being able to run some interesting programs like Simon or Mastermind or Hammurabi. Everything is common 7400-series parts except the RAM and ROM, and the plans call for just 16 chips, which is very lightweight compared to past custom CPUs I’ve built.

This entry was posted on Wednesday, August 28th, 2013 at 11:00 am and is filed under project logs. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

3 Responses to “Nibbler: Another 7400 4-bit custom CPU”

  1. Mel says:

    That would be sweet. I haven’t seen a 74181 on the market for decades. But Xilinx is sending a lot of cold-call email lately. Simulating that ungettable chip would be next-best.

  2. Mel says:


    Well, I’ve learned something! It’s all in knowing how to look.

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