How would you like a failed crowdfunded project? Cute idea and all, but "Tape-out in November" and "The peripherals like UART, PWM, I2C, etc., still need to be integrated." screams "we have no idea what we're doing".https://twitter.com/hackaday/status/1032809991000997889 …
And probably not a run of three-core chips with peripherals, RAM, and 72 I/O.
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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
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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.
End of conversation
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