I think they were the other way round. I reckon 1979 for the Tangerine and 1980 for the ZX80. I also drooled over that Microtan and ended up with a ZX81. By the way, there's a superb website devoted to the Microtan 65 here: http://www.geoff.org.uk/microtan_65.htm. It's got scans of manuals, magazines and all sorts. paul