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* [http://brooknet.no-ip.com/~lex/public/zx81/zx81_assembly_instructions.pdf ZX81 Assembly Instructions] (pdf)
* [http://www.classiccmp.org/cini/pdf/random/Timex-Sinclair%20ZX81%20Assembly.pdf ZX81 Assembly Instructions U.S. Version for UHF Channel 33] (pdf)
* [httphttps://yourcomputeronlinemagazinesfromthepast.wordpressfandom.com/tag/brendon-gorewiki/ Brendon_Gore Brendon Gore] ('''1982'''). ''[http://yourcomputeronline.wordpress.com/2011/02/27/interview-one-degree-in-artic/ Interview-One Degree In Artic]''. [[Your Computer]], [http://yourcomputeronline.wordpress.com/2011/02/23/may-1982-contents-and-editorial/ May 1982]* [[David Horne]] ('''1982'''). ''[http://yourcomputeronline.wordpress.com/2011/05/24/zx-81-disassembler/ ZX-81 Disassembler]''. [[Your Computer]], [http://yourcomputeronline.wordpress.com/2011/04/20/july-1982-contents-and-editorial/ July 1982]* [http://yourcomputeronline.wordpress.com/tag/stuart-nicholls/page/3/ Stuart Nicholls] ('''1982'''). ''[http://yourcomputeronline.wordpress.com/2012/09/22/zx-81-games-writing/ ZX-81 Games Writing]''. [[Your Computer]], [http://yourcomputeronline.wordpress.com/2011/11/13/november-1982-contents-and-editorial/ November 1982]* [[David Horne]] ('''1982'''). ''[http://yourcomputeronline.wordpress.com/2012/10/21/chess-in-1k/ Chess in 1K]''. [[Your Computer]], [http://yourcomputeronline.wordpress.com/2012/10/04/december-1982-contents-and-editorial/ December 1982]* [[David Horne]] ('''1983'''). ''ZX-81 Chess''. [[Your Computer]], [http://yourcomputeronline.wordpress.com/2012/11/03/january-1983-contents-and-editorial/ January 1983]* [[David Horne]] ('''1983'''). ''[httphttps://users.ox.ac.uk/~uzdm0006/scans/1kchess/ Full ZX-81 Chess in 1K]''. [[Your Computer]], February 1983
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