Masatoshi Mashima Rarlab
Shizuoka, JapanAlma mater(B.S., 1967)(Dr.Eng., 1991)Known for:,Peripheral chips:,Awards(1997)Fellow (2009)Scientific careerFieldsmicroprocessorInstitutions(1967-1972)(1972-1975)(1975-1980)(2000)Masatoshi Shima ( 嶋 正利, Shima Masatoshi, born August 22, 1943, ) is a Japanese electronics engineer. He was one of the architects of the world's first, the. Working for in Japan, in 1968 he did the logic design for a specialized to be translated into three-chip custom chips. In 1969 he worked with 's and to reduce the 3- chip proposal into a single-chip architecture. In 1970 that architecture was transformed into a silicon chip, the, by, with Shima's assistance in logic design.He later joined in 1972. There, he worked with Faggin to develop the, released in 1974. Shima then developed a number of Intel peripheral chips, some used in the, such as the, chip, timer chip, chip and chip.
He then joined, where he worked with Faggin to develop the (1976) and (1979). Contents.Early life and career He studied at in,.
With poor prospects for employment in the field of chemistry, he went to work for, a business manufacturer, joining in Spring 1967. There, he learned about software and digital logic design, from 1967 to 1968. Intel 4004 After Busicom decided to use (LSI) circuits in their calculator products, they began work on what later became known as the 'Busicom Project', a chipset for the that led to the creation of the first, the. In April 1968, Shima was asked to design the chipset and software for the calculator.
Shima designed a special-purpose LSI chipset, along with his supervisor Tadashi Tanba, in 1968. His design consisted of seven LSI chips, including a three-chip. Shima's initial design included , multiplier units, and a to control a system. Busicom wanted to produce a general-purpose LSI chipset, for not only desktop calculators, but also other equipment such as a,.
Shima began work on a general-purpose LSI chipset in late 1968, and Busicom then approached the companies and for manufacturing help. The job was given to Intel, who back then was more of a memory company and had facilities to manufacture the high density chip Busicom required.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. Intel wanted a single-chip CPU design, influenced by 's who had presented the concept to Intel in 1968. This was then formulated by Intel's in 1969, simplifying Shima's initial design down to four chips, including a single-chip CPU.
Due to Hoff's formulation lacking key details, Shima came up with his own ideas to find solutions for its implementation. They both eventually realized the microprocessor concept, with the help of Intel's to interpret the ideas of Shima and Hoff. Shima was responsible for adding a 10-bit static to make it useful as a printer's buffer and keyboard interface, many improvements in the, making the organization suitable for a calculator, the information transfer, the key program in an area of performance and program capacity, the functional specification, decimal computer idea, software, desktop calculator logic, real-time control, and data exchange instruction between the. 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.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, who had only joined Intel a week before Shima arrived. After explaining the project to Faggin, Shima worked with him to design the 4004 processor, with Shima responsible for the chip's logic. He worked at the Intel offices for six months—from April until October 1970.
Minoru Kojima
His company then sold the rights to use the 4004 to Intel, with the exception of use in business calculators.Intel 8080 to Zilog Z8000 After the 4004, Intel designed the (architecture by Computer Terminal Corporation, design by Federico Faggin and Hal Feeney). Shima then joined Intel in 1972. He was employed to implement the transistor-level logic of Intel's next microprocessor, which became the (conception and architecture by Federico Faggin), released in 1974. Shima then developed a number of Intel peripheral chips, some used in the, such as the, chip, timer chip, chip and chip. He was not involved in the creation of the or.Shima moved to in 1975 and, using only a small number of assistants, developed the transistor-level and physical implementation of the, under the supervision of Faggin, who conceived and designed the Z80 architecture to be instruction set compatible with the Intel 8080. This was followed by the same task for the.According to co-workers 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 therefore hard to read, but as transistors were drawn in such a way that they suggested a 'floorplan' of the chip, it actually helped when making the physical chip layout.
However, according to Shima himself, the logic was first tested on breadboards using 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 market. He became a professor at the in 2000.
Prizes. 1997 (Advanced Technology). 2009 Fellow of the 'for his work as part of the team that developed the Intel 4004, the world's first commercial microprocessor.'
. 2015-10-03 at the. ^,. ^.
Reichi Nakaido
^ Nigel Tout. Retrieved November 15, 2009. ^, IEEE Solid-State Circuits Magazine, Winter 2009,. Aspray, William (1994-05-25). Interview #211 for the Center for the History of Electrical Engineering. The Institute of Electrical and Electronics Engineers, Inc. Retrieved 2013-01-02.
Zilog had a total of 11 employees at the time, but grew to more than 1000 in a very short time. CHM. Archived from on October 3, 2015. Retrieved March 30, 2015.External links.