Keyboard PS/2Very common connector. The PS/2 keyboard interface electronically identical to the long-established AT interface, but the cable connector is a 6-pin mini-DIN interface.
Mouse (PS/2)PS2 ports use synchronous serial signals to communicate between computer and keyboard or mouse
PC Gameport+MIDIThe game port is the traditional connection for video game input devices on an x86-based PCs. The game port is usually integrated with a PC I/O or sound card, either ISA or PCI, or as an on-board feature of some motherboards.
Osborne 1 keyboardFound on the Osborne 1 luggable computer, released by Osborne Computer Corporation in 1981. This pinout came from the Osborne 1 Technical Manual, and I have had a quick look at the PCB to check it.
SGI
SGI keyboardMini-DIN-6 keyboard connectors are found on Indigo, Indigo2, Indy, O2, Octane, and Onyx systems. This pinout is for Indigo systems which _is not_ P/S2 compatible. Indigo2, Indy, O2, Octane, and Onyx systems uses standard ps/2 port.