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*[http://www.cpctech.org.uk/ Unofficial WWW Amstrad Resource]
*[httpshttp://www.grimware.org/doku.php/ Grimware Hacking Handbook]is a really nice site with hardware info and hacks for the CPC machines... give it a try!
*[http://logonsystem.eu/html/downloadlogon.htm CRTC Compendium] Everything about the CRTC - incl. examples