I've a unit out in the field which the customer has asked me to add some features to. It currently runs using a DIP mega644P. The changes are easy except that I will need more than 4k RAM, probably nearer 6k, it currently uses just over 1k. In the absence of the mega1284P does anyone know of a DIP adaptor/'stamp' style board with a mega1280/1281/2560/2561 mounted on it BUT with a pin-out to match the 644P? Or a mega128 and XRAM?