Amstrad 512 and its big brother the 640, I used to repair these for a living! Oh and remember the PCW9512? Plug the printer in when it was switched on and presto 100 quid for a new power supply! the PC512 and 640 had an interface called GEM. 3 clicks of the mouse button and it would crash! I also used to Repair Beebs, Archimedes, Commodore 64 and the ZX-81 (ZTX650 transistors and Ram being the only failures) or the occasional Z80 CPU. Then along came the Atari ST and the Commodore Amiga and then, well the whole world changed then didn't it (Motorola 68xxx)!