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Dumb idea, but could the project be done with FPGA instead of custom ASIC ? At least you can iterate. Seems there's already some core https://opencores.org/project/a-z80
They already have the cores running on an FPGA. And you can already buy cheaper FPGAs that will fit that design than the price they're charging for a single chip, which makes this whole thing even sillier. The only thing an FPGA won't give you is native 5V I/O.
