I still have the power connector (DIN-6) for my first cassette recorder a Norelco Carrycorder or some such name. The original cassette. About the late 70’s I got a “high end” Pioneer car ...

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.