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.

The last firmware update included an AT keyboard decoder library for both hardware versions. There’s a ton of old AT keyboards making their way to the landfill. We’ll show you how to recycle ...