Linux boots in 4.76 days on the Intel 4004
Briefly

Grinberg's achievement demonstrates the incredible adaptability of modern technology, allowing Linux, a complex operating system, to run on one of the most primitive CPUs ever designed.
Emulating a MIPS R3000 processor enables Grinberg's 4004 to run Linux indirectly. This creative workaround showcases the innovation within the hardware hacking community.
The process involved significant engineering, utilizing lookup tables and custom solutions to surmount the 4004's extreme limitations in RAM and logic operations.
Grinberg's previous success with running Linux on an AVR microcontroller solidifies his reputation, and his quest for pushing boundaries continues with the 4004.
Read at Ars Technica
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