> Could a unit be made with an unprogrammed FPGA to avoid > all the copyright/patent issues ... ?
FPGAs normally *are* unprogrammed; you upload a bitstream and they instantly reconfigure, as many times as you like. It's possible to make and sell them preconfigured, but obviously that's not useful in this instance.
FPGArcade.com actually made and sold a small number of a little box with an unprogrammed FPGA, A/V outputs, and an ARM CPU to assist in programming the FPGA. You upload the bitstream for whatever system you want to emulate from your PC and it goes. Add built-in controls, a screen, and battery power and you're good to go (I'm sure it'd take Ben Heck about a minute and a half ;-)
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