Bill Kotaska's Busicom 141-PF Replica edit / delete

Build your own 4004-based calculator (the original microprocessor application).

to 4004 calculator electronics retrocomputing ... on 17 November 2008

Intel 4004 — 35th Anniversary Project edit / delete

Includes source code for the Busicom calculator that first used the 4004.

to 4004 electronics microprocessor retrocomputing ... on 12 August 2008

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