1. 
   ZX-81
   (computer) An even more successful version of the Sinclair ZX-80, featuring a large uncommitted logic array instead of much discrete logic, an improved BASIC, and rather more expandability (it could take 16kb RAM packs). It was launched around 1981 and was eventually replaced by the Spectrum. (1995...
   Found op http://foldoc.org/ZX-81
   
   
2. 
   Zx81
   The ZX81 was a revolutionary computer invented by Clive Sinclair and released in 1981. It was based upon the Z80 microprocessor, and used only three other chips in the basic model which had just 1K of RAM (enough to hold a functional player v computer chess game). It had a built in BASIC interpreter...
   Found op http://www.probertencyclopaedia.com/browse/GZ.HTM
   
   

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