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In 1968, Shima worked for Busicom in Japan, and did the logic design for a specialized CPU to be translated into three-chip custom chips. In 1969, he worked with Intel 's Ted Hoff and Stanley Mazor to reduce the three-chip Busicom proposal into a one-chip architecture.
May 17, 1994 · Shima received a bachelor's degree in organic chemistry from Tohoku University, and from there began work at Busicom, moving from their business software division to hardware. By 1968 he was working to combine software and hardware concerns in the development of the desktop calculator.
Aug 9, 2024 · In 1969, Shima worked at Japanese calculator manufacturer Busicom when it accepted a proposal by Intel to implement the logic for their new calculator in large-scale integration (LSI) logic.
Jul 18, 2008 · Dr Masatoshi Shima was one of the Busicom team which went over to Santa Clara in June 1969 to commission Intel to produce a set of chips for a calculator. Shima wrote the functional description of the 4004 chip-set’s CPU, and designed its logic.
Masatoshi Shima was the engineer responsible for the Busicom calculator design. He came from Japan a few days after Faggin joined Intel, to check the logic design of the chip set. He was dismayed and very angry to see that Hoff's proposal had not progressed from his last visit, six months before, against Intel's promises.
Nov 16, 2021 · It was late March or early April in 1970, and Busicom’s Masatoshi Shima was very angry! He’d visited Intel with Busicom executives several times in 1969, and Busicom had agreed to pay Intel a development fee to design and manufacture a proprietary 4-chip set for Busicom’s modular 141-PF calculator.
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The job was given to Intel, who back then was more of a memory company and had facilities to manufacture the high density silicon gate MOS chip Busicom required. Following Marcian "Ted" Hoff's initial conception, he designed the 4004 processor at the Intel offices with Hoff and Federico Faggin.
