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[http://www.retrocomputers.eu/2012/06/25/amstrad-cpc464-upgraded-to-a-cpc6128-how-to/ How to convert a Amstrad CPC464 into a CPC6128. | Retro Computers]<BR>
[http://www.cpcoxygen.fxcomputers.ie/magazine/01/super464/super464.htm Super 464 | CPC Oxygen]<BR>[http://www.freetimeweb.nl/home/computer/cpc/cpc_464_extended_uk.html THE AMSTRAD / SCHNEIDER CPC EXTENDED]