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80sNostalgia.com - Exolon
http://www.80snostalgia.com/computers/spectrum/exolon.html
Includes screen shots, and a Spectrum Emulator ROM.
Your Sinclair Review
http://www.ysrnry.co.uk/articles/exolon.htm
Rated 9/10 by Gwyn Hughes. "Three words say it all. Exolon - extreme excellence!"