If only the cash was available to make a memristor based FPGA Amiga. It doesn't matter what the chips are when you can write them on the fly. Current FPGA is the next best thing and to my mind Xorro and Xena would have been better replaced by a large slice of FPGA cake. Natami was a great idea too but alas...
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As far as backwards compatibility is concerned with the "real Amiga or not" argument, I have but one word for you.... Mac.
