The connectors are these ancient DIN things, and I don't know what type of adapter I need to use them. Also, documentation on this thing is sparse online, can't seem to find any manuals. Anyway, I ...

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.