Ah the clever XT/AT hardware:

- hard-drive on expansion card

- null modem cable (LapLink had two cables: one parallel , and one serial with a pair of DB25 and DB9 on each end)

- parasitic-powered serial devices

- Northgate keyboards with a ctrl-alt-del button

- game port Y cable (two analog joysticks on one standard game port)

- Microsoft Sidewinder 3D Pro joystick for mostly-compatible digital support (supported by Mechwarrior under DOS)

- Thrustmaster F-16 FLCS/TQS/RCS