Sinclair ZX81 Keyboard
[Jurassic Tech: The Sinclair ZX81 By Todd Ogasawara. At [ http://anewdomain.net/2011/12/30/jurassic-tech-the-sinclair-zx81/ ] , accessed on 2014-02-02 ]
[Sinclair's 1984 big shot at business: The QL is 30 years old: Quantum Leap micro leapt too early By Tony Smith. At http://www.theregister.co.uk/2014/01/12/archaeologic_sinclair_ql/ , accessed on 2014-02-02 ]
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