Is a still operating Sinclair Spectrum (still powering away at 2mhz) ,which has the OS and Terry Pratchett's discworld game on it. I used to call it Little Iron (which is in fact the netbios name of my laptop now) , which struck me as incredibly funny at the time.

Hehe thats one slow computer. I remember the first pc I owned was a 386, i think it was something like 33 mhz, and it had a push button to slow it down to like 20mhz for old old games. Wow that thing really did suck hehe. Just imagine trying to do anything with 33mhz of pure processing power HAHA.