The Z-80 has a 4-bit ALU. Here's how it works.
4-bit CPU
Build an 8-bit computer | Ben Eater
Galactic Electronics Projects - 4 Bit CPU
4-bit CPU
Fourbit, 4-bit homebrew CPU
Schematic of 4-bit Arithmetic Unit | Download Scientific Diagram
Custom 4-Bit CPU Schematic and Control | Big Mess o' Wires
Nibbler 4 Bit CPU | Big Mess o' Wires
Organization of Computer Systems: Processor & Datapath
8-bit CPU
Layout of a 4-bit ALU. | Download Scientific Diagram
Galactic Electronics Projects - 4 Bit CPU
4-Bit Computer – Waiting for Friday
Build an 8-bit computer | Ben Eater
4-Bit Mini CPU - CircuitLab
Building a 4-Bit Computer from the Ground Up - EEWeb
Design and Simulation of a Pipelined 4 bit Computer
Design of an Efficient Low Power 4-bit Arithmatic Logic Unit (ALU) Using VHDL
Schematic | 4-Bit CPU
Building a 4-Bit Computer: Mitigating Metastability (Part 4) - EEWeb
MP-4 Simplest 4 Bit TTL CPU : 9 Steps - Instructables
Custom 4-Bit CPU Schematic and Control | Big Mess o' Wires
Tutorials/Redstone computers – Minecraft Wiki
Minimalist 4-bit Processor Focused on Processors Theory Teaching | Semantic Scholar
