EDN

Building a 4-Bit Computer: The Instruction Set

The registers inside the CPU, the machine code instruction set, and the ways in which the instructions interact with the registers and status flags are all intertwined. As you may recall, one of my ...
EDN

Building a 4-Bit Computer from the Ground Up

What we are going to do is design a simple 4-bit computer at the primitive logic gate and flip-flop level and then implement it in the technology of our choice I’ve often wondered what would happen if ...
Hackaday

DDL-4 Is A Visually Pleasing Modular CPU

Today’s CPUs are so advanced that they might as well be indistinguishable from magic, right? Wrong! Fundamentally, modern CPUs can be understood logically like any other technology, it’s just that ...
ExtremeTech

First Mover: Intel's 4-bit 4004 CPU Turns 50

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PC Magazine

bit slice processor

An earlier logic chip used as a building block for CPUs. Bit slice processors used arithmetic logic units (ALUs) that typically came in 4-bit increments, although 1- and 2-bit devices were also made.