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Gate-level emulation of an Intel 4004 in 4004 bytes of C
https://nicholas.carlini.com/writing/2025/ioccc-intel-4004-in-4004-bytes-c.html
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A feature-complete gate-level microcoded Intel 4004 in 4004 bytes of C, capable of emulating the original Busicom calculator ROM for which the chip was originally designed.
