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.

It connects to the keyboard using the original mini-DIN connector, and is housed in the classic Altoids tin enclosure. Since the protocol used by NeXT isn’t standard, they had to figure it out ...

It’s not too much of a chore to find a keyboard that’ll talk to a PC-AT, but the PC-XT had an entirely different protocol, not to mention that chunky 5-pin DIN connector. As with many things ...