A simple 4-bit CPU and computer, built entirely with 7400 series parts.
Instructions for the Nibbler 4-bit CPU come in two types: immediate and addressed. Both types begin with 4 bits of instruction opcode, to identify the specific instruction. Immediate instructions like ADDI include a 4-bit operand value embedded in the instruction,…
Enough with the vague design talk – here’s the circuit schematic for the Nibbler 4-bit CPU! Click the image to zoom in to a full size view. The whole system fits on a single page, including the CPU itself and…
Say hello to Nibbler, the 4-bit homemade CPU! Ever since I built BMOW1, people have written to me asking how to make their own homebrew computers. BMOW is a complex design that can be difficult to comprehend, so I decided…
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