The GMC-4 is the only 4-bit microcomputer to be mass-produced in the last 30 years (as of 2009).^[1] 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.

The purpose of the GMC-4 is education.^{[citation needed]} It provides an accessible way to learn about assembly language and the principles of computing.