The 5-pin DIN keyboard connector used with the first IBM PC (1981) and second-generation IBM AT (1984). It was subsequently replaced with the smaller 6-pin Mini-DIN connector on the IBM PS/2 in 1987.

DIN connectors are high frequency, multi-pin, electrical connectors ... connectors are available. Male connectors plug into receptacles, jacks, and outlets and contain three to fourteen pins ranging ...