The Z-80 has a 4-bit ALU. Here's how it works.
4-bit CPU
Design and Simulation of a Pipelined 4 bit Computer
Figure 4 from Simple 4-bit processor based on quantum-dot cellular automata (QCA) | Semantic Scholar
Warren's Crazy Small CPU
Example Target Processor Fig. 2 shows a simple 4-bit processor... | Download Scientific Diagram
Building a 4 bit CPU homebrew computer: The Design
Design and Simulation of a Pipelined 4 bit Computer
4-bit computing - Wikipedia
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Design and implementation 8 bit CPU architecture on Logisim for undergraduate learning support | Semantic Scholar
Binary Logic (UPDATE: 4-Bit CPU simulation, no combincators!) - Factorio Forums
8-bit CPU build :: Ben Simmonds
Solved 1. Consider the 4-bit CPU architecture given below. | Chegg.com
Mark 2 FORTH Computer
CPU Design | a custom developed CPU – Gate by Gate…
4-Bit-Microprocessor - YouTube
4 bit computer built from discrete transistors | Hackaday.io
Minimalist 4-bit Processor Focused on Processors Theory Teaching | Semantic Scholar
Nibbler 4 Bit CPU | Big Mess o' Wires
IA-64 - Wikipedia
Nibbler 4 Bit CPU | Big Mess o' Wires
ICS4U CHUMP Project: A 4-bit TTL Processor
Building a 4-Bit Computer from the Ground Up - EEWeb
