My friend has a 1993 'Notebook 486 Professional' laptop with a mains power supply unit Model 'ESP-5020'. The wires into the plug which goes in to the laptop from the supply unit have burnt through - inside the plug, which has therefore fallen off. The plug itself is moulded and doesn't appear to come to bits. Can anyone suggest where I might find a plug, and also which wire (there are 3) goes on which pin ? A modern universal power unit (240V: 20V/2.4A) would be OK but the plug would not fit. (the plug looks a bit like a DIN plug with 1 thin pin and 2 thicker pins). I could put photos of the plug on my web site if required. Any advice gratefully received xquest.