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This was then formulated by Intel's Marcian "Ted" Hoff in 1969, simplifying Shima's initial design down to four chips, including a one-chip CPU. Intel wanted a one-chip CPU design, influenced by Sharp's Tadashi Sasaki who had presented the concept to Intel in 1968. Due to Intel lacking logic engineers to understand the logic schematics or circuit engineers to convert them, Intel asked Shima to simplify the logic. Shima went to Intel in June 1969 to present the proposal. 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 metal–oxide–semiconductor ( MOS) chip Busicom required. Shima began work on a general-purpose LSI chipset in late 1968, and Busicom then approached the American companies Mostek and Intel for converting the logic into MOS circuits and the chips layout for manufacturing. Busicom wanted to produce a general-purpose LSI chipset, for not only desktop calculators, but also other equipment such as a teller machine, cash register and billing machine. Shima's initial design included arithmetic units ( adders), multiplier units, registers, read-only memory, and a macro-instruction set to control a decimal computer system. His design consisted of seven LSI chips, including a three-chip CPU. Shima designed a special-purpose LSI chipset, along with his supervisor Tadashi Tanba, in 1968.
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In April 1968, Shima was asked to design the logic for what was intended to become a future chipset to be designed and produced by a semiconductor company. Intel 4004 Īfter Busicom decided to use large-scale integration (LSI) circuits in their calculator products, they began work on what later became known as the "Busicom Project", a chipset for the Busicom 141-PF calculator that led to creating the first microprocessor, the Intel 4004.
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There, he learned about software and digital logic design, from 1967 to 1968. With poor prospects for employment in the field of chemistry, he went to work for Busicom, a business calculator manufacturer, joining in Spring 1967. He studied organic chemistry at Tohoku University in Sendai, Miyagi Prefecture, Japan. He then joined Zilog, where he worked with Faggin to develop the Zilog Z80 (1976) and Z8000 (1979).
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Shima then developed several Intel peripheral chips, some used in the IBM PC, such as the 8259 interrupt controller, 8255 programmable peripheral interface chip, 8253 timer chip, 8257 direct memory access (DMA) chip and 8251 serial communication USART chip. There, he worked with Faggin to develop the Intel 8080, released in 1974. In 1970, that architecture was transformed into a silicon chip, the Intel 4004, by Federico Faggin, with Shima's assistance in logic design.
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In 1969, he worked with Intel's Ted Hoff and Stanley Mazor to reduce the three-chip Busicom proposal into a one-chip architecture. 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. He was one of the architects of the world's first microprocessor, the Intel 4004. Masatoshi Shima ( 嶋 正利, Shima Masatoshi, born August 22, 1943, Shizuoka) is a Japanese electronics engineer.