GMC-4
Japanese microcomputer
title: "GMC-4" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["microcomputers", "single-board-computers"] description: "Japanese microcomputer" topic_path: "general/microcomputers" source: "https://en.wikipedia.org/wiki/GMC-4" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Japanese microcomputer ::
::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/1d/Gmc-4n.jpg" caption="GMC-4"] ::
The GMC-4 is the only 4-bit microcomputer to be mass-produced in the last 30 years (as of 2009). It was produced by Gakken, a Japanese publisher who distributed it with a magazine attached to a box containing the components required to assemble the computer. It is based on the Texas Instruments TMS1100 microcontroller.
The GMC-4 is a modernized version of Gakken's 1983 Gakken FX-System, also known as the R-165. This system was also sold by Radio Shack as the Science Fair Microcomputer Trainer, but replaced the FX's circuit board with hand-wired circuity assembled by the user using springs to hold short bits of wire.
The purpose of the GMC-4 is education. It provides an accessible way to learn about assembly language and the principles of computing.
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