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description=The Intel 4004: Recovered, Rebuilt, Remembered. An international project keeping Intel’s first microprocessor alive: schematics, mask artwork, Busicom 141-PF firmware, and history.;

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the intel 4004 recovered rebuilt remembered 4004 com skip to content the intel 4004 microprocessor 4004 com a history and reverse engineering project news writings exhibit research busicom 141 pf 2006 talks faq downloads about search the intel 4004 recovered rebuilt remembered an international project keeping intel s first microprocessor alive for future generations our mission is to make computer science and digital electronics accessible to historians students hobbyists and curious museum visitors around the world were you an engineer in the 1970s with stories to tell are you a maker with a vintage electronics project you are proud of contact us at tim at tuva dot us the 35th anniversary talks 2006 two of the 4004 s inventors ted hoff and federico faggin and tim mcnerney at the computer history museum video audio transcript and slides latest november 15 2025 happy 54th anniversary 4004 swiss enter museum s intel 4004 interactive exhibit opening 2026 a sneak preview november 2025 update klaus scheffler and lajos kintli recently finished a complete mcs 4 intel 4004 family 4 bit computer built from discrete transistors finally implementing all of the original busicom 141 pf calculator logic in hardware and 4004 assembly language plus their additional fine tuning was rewarded with additional performance that now exceeds the original 4004 s clock speed of 740 khz by a factor of 2x this seven chip computer can now run at speeds up to 1 5 mhz 8 to get 187 500 instructions s this result was achieved by scheffler s original choice of low capacitance 4 terminal fets designed for rf applications and many hours of hard work most modern discrete fets are designed for power switching and thus have a high gate capacitance photo credit klaus scheffler photo legend center bottom 4004 cpu center top 4001 rom upper left three 4003 shift registers right two 4002 rams lower left interactive busicom 141 pf calculator user interface replica all news 1971 2025 explore the exhibit story how the 4004 schematics came out of intel s vault 2004 2006 schematics masks simulator the whole mcs 4 chip family reverse engineered busicom 141 pf the calculator that started it all firmware simulator replicas writings stories essays talks and documents 1971 2025 the 2006 exhibit the intel museum exhibit its story and credits downloads firmware simulators schematics recent news nov 15 2025 complete discrete transistor mcs 4 computer enter museum exhibit preview 2025 busicom 141 pf simulator in webassembly nov 15 2023 discrete transistor 4004 core computes digits of pi feb 20 2023 first fully functional discrete transistor 4004 nov 15 2022 mcs 4 analyzer simulator repackaged feb 8 2021 federico faggin publishes his memoir silicon nov 15 2020 erturk kocalar s 4004 retroshield works on this site are licensed under a creative commons attribution noncommercial sharealike 3 0 license unless noted intel is a registered trademark of intel corporation this site is not affiliated with intel legal notices contact site map