Masatoshi Shima

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8251
AwardsKyoto Prize (1997)
Computer History Museum Fellow (2009)[1]
Scientific career
FieldsElectronic engineering
Microprocessor
InstitutionsBusicom (1967-1972)
Intel (1972-1975)
Zilog (1975-1980)[2]
University of Aizu (2000)

Masatoshi Shima (嶋 正利, Shima Masatoshi, born August 22, 1943,

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. In 1970, that architecture was transformed into a silicon chip, the Intel 4004, by Federico Faggin, with Shima's assistance in logic design.[3][4][5]

He later joined

Z8000 (1979).[2]

Early life and career

He studied organic chemistry at Tohoku University in Sendai, Miyagi Prefecture, Japan. With poor prospects for employment in the field of chemistry, he went to work for Busicom, a business calculator manufacturer, joining in Spring 1967. There, he learned about software and digital logic design, from 1967 to 1968.[3]

Intel 4004

After Busicom decided to use

silicon gate metal–oxide–semiconductor (MOS) chip Busicom required.[3]

Shima went to Intel in June 1969 to present the proposal. Due to Intel lacking logic engineers to understand the logic schematics or circuit engineers to convert them, Intel asked Shima to simplify the logic.

general-purpose register.[3] The specifications of the four chips were developed over a period of a few months in 1969, between an Intel team led by Hoff and a Busicom team led by Shima.[5]

After Shima went back to Japan in late 1969 and then returned to Intel in early 1970, he found that no further work had been done on the 4004 since he left, and that Hoff was no longer working on the project. The project leader had become Federico Faggin, who had only joined Intel a week before Shima arrived. Faggin was hired from Fairchild Semiconductor, where he had developed the original MOS silicon gate technology, the only technology that could be used to design a chip of the complexity and speed of the 4004. Shima worked with him, assisting him with the logic design the 4004 processor [3] He worked at the Intel offices for six months, from April until October 1970. His company then sold the rights to use the 4004 to Intel, with an exception for use in business calculators.

Intel 8080 to Zilog Z8000

After the 4004, Intel designed the

USART chip.[2] He was not involved in the creation of the Intel 8088 or 8086
.

Shima moved to Zilog in 1975 and, using only a few assistants,[8] developed the transistor-level and physical implementation of the Zilog Z80, under the supervision of Faggin, who conceived and designed the Z80 architecture to be an instruction set compatible with the Intel 8080. This was followed by the same task for the 16-bit Z8000.[3]

According to coworkers from Intel, Faggin's method that Shima used was to design all logic at the transistor level, directly and manually, not at the gate and/or register level. The schematics were thus hard to read, but as transistors were drawn in such a way that they suggested a "floorplan" of the chip,[9] it helped when making the physical chip layout. However, according to Shima, the logic was first tested on breadboards using transistor–transistor logic (TTL) chips, before being manually translated into MOS transistor equivalents.

After returning to Japan, Shima founded the Intel Japan Design Center in 1980, and VM Technology Corporation in 1986. At VM, he developed the 16-bit microprocessor VM860 and 32-bit microprocessor VM 8600 for the Japanese word processor market. He became a professor at the University of Aizu in 2000.[2]

Prizes

  • 1997 Kyoto Prize (Advanced Technology)
  • 2009 Fellow of the Computer History Museum "for his work as part of the team that developed the Intel 4004, the world's first commercial microprocessor."[10]

Notes

  1. ^ "Masatoshi Shima 2009 Fellow". Computer History Museum. 2009. Archived from the original on 2015-10-03.
  2. ^ a b c d e Shima Masatoshi, Information Processing Society of Japan
  3. ^ a b c d e f g h i j "Masatoshi Shima" (PDF). Institute of Electrical and Electronics Engineers (IEEE). Archived (PDF) from the original on 2008-12-19. Retrieved 2008-12-19.
  4. ^ a b c d Tout, Nigel. "The Busicom 141-PF calculator and the Intel 4004 microprocessor". Retrieved November 15, 2009.
  5. ^ a b c d e Faggin, Federico (Winter 2009). "The Making of the First Microprocessor". IEEE Solid-State Circuits Magazine. IEEE Xplore. pp. 8–21.
  6. ^ Oral-History:Masatoshi Shima
  7. ^ Aspray, William (1994-05-25). "Oral-History: Tadashi Sasaki". Interview #211 for the Center for the History of Electrical Engineering. The Institute of Electrical and Electronics Engineers. Retrieved 2013-01-02.
  8. ^ Zilog had 11 total employees at the time, but grew to more than 1000 in a very short time.
  9. ^ Alfke, Peter; Dalrymple, Monte (December 23, 2005). "RTL for Z8000 series CPU?". Google Groups: comp.lang.vhdl. Retrieved 2020-03-27.
  10. ^ CHM. "Masatoshi Shima: CHM Fellow Award Winner". Archived from the original on October 3, 2015. Retrieved March 30, 2015.

External links

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