It is time for open source and hardware preservation community to step in with a Free and Open Source Silicon (FOSS) replacement for Zilog Z80... To develop a drop-in Z80 replacement in 8-bit home computers such as ZX Spectrum.
Crafting a chip generally involves designing the component; testing and validating it in simulations; and then taping out the blueprint for an initial production run... more than a single developer would ordinarily be prepared to pay for.
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