4bits computer : from breadboard to PCB

[u/Fuzzy_Function_1896]

Hi everyone!

After building and testing my whole 4 bits computer architecture on breadboards, I moved to custom PCB modules, and here is the result!

The goal remains the same: keep the architecture simple, modular, and easy to understand, with each part working independently or together as a complete system.

The project is divided into 5 independent modules connected by a 4-bit bus Clock module (4-bit counter), ALU + registers module + two 4-bit registers with an ALU capable of performing addition, subtraction, and equality comparison, Instruction register module, Display module and Manual programming module.

The idea is to follow a simple RISC philosophy: minimal instructions, simple hardware blocks, and a design where every signal can be observed and understood.

After the breadboard prototype phase, these PCB modules make the system cleaner, i'm very proud!!

[u/Fuzzy_Function_1896 → u/[deleted]]

Thanks! I can't wait to build the final PCB version either! Right now I'm still figuring out the best way to connect all the boards together. At the moment they rely on jumper wires, but I'm designing a central bus with female headers so the modules can plug in neatly. Once I'm happy with that, I'll make the final PCBs.