Weve previously looked at how the Raspberry Pi can be used as a retro gaming system, and as a substitute desktop PC for low-level office tasks ? but did you also know that you can run several classic operating systems on the tiny computer? If youve been involved in computing for twenty plus years, this may prove useful for looking at old data. Alternatively, you might fancy checking out some old games. The RetroPi collection of emulators are primarily from gaming systems, but ROMs for older desktop operating systems can also have their place.