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If you need a replacement processor for your Dragon or CoCo, try the following links. All of them are a suitable replacement for the Dragon's Motorola MC6809EP.

MC6809EP (1.0MHz)
http://www.ebay.co.uk/itm/MC6809EP-/260 ... 1296428043


MC68B09EP (2.0MHz)
http://www.ebay.co.uk/itm/MC68B09EP-8-B ... 6172430835


HD68B09EP (2.0MHz)
http://www.ebay.co.uk/itm/HD68B09EP-Man ... 1c24848751


HD63C09EP (3.5MHz)
http://www.littlediode.com/components/HD63C09EP.html