Intel's Ted Hoff was assigned to studying Busicom's design, and came up with a much more elegant, 4 ICs architecture centered on what was to become the 4004 microprocessor surrounded by a mixture of 3 different ICs containing ROM, shift registers, input/output ports and RAM—Intel's first product (1969) was the 3101 Schottky TTL bipolar 64-bit SRAM.
In 1969, Ted Hoff conceived the commercial microprocessor at Intel and thus ignited the development of the personal computer.
Hoff joined Intel in 1968 as employee number 12, and is credited with coming up with the idea of using a "universal processor" rather than a variety of custom-designed circuits in the architectural idea and an instruction set formulated with Stanley Mazor in 1969 for the Intel 4004 - the chip that started the microprocessor revolution in the early 1970s.
Following Marcian "Ted" Hoff's initial conception, formulated in 1969, Shima later helped design the 4004 processor, working at the Intel offices for six months- from April until October 1970- with Federico Faggin, the project leader.
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