Intel marked one of the more important anniversaries in technology on Tuesday with the 40th anniversary of the Intel 4004. The 740KHz chip is generally considered the first real microprocessor, or a singular, small integrated circuit chip that served as the core of a device. It was made before November 15 for a Busicom 141-PF calculator as part of a four-chip set before Intel managed to get rights to sell it as a general purpose chip for anyone, which it did when the November 15, 1971 issue of Electronic News was published.
