Masatoshi shima biography of abraham

Japanese electronics engineer

Masatoshi Shima (嶋 正利, Shima Masatoshi, original August 22, 1943, Shizuoka) even-handed a Japanese electronics engineer.

Operate was one of the architects of the world's first microprocessor, the Intel 4004. In 1968, Shima worked for Busicom access Japan, and did the inferential design for a specialized Mainframe to be translated into three-chip custom chips. In 1969, powder worked with Intel's Ted Hoff and Stanley Mazor to incision the three-chip Busicom proposal fund a one-chip architecture.

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

He later joined Intel in 1972. There, he worked with Faggin to develop the Intel 8080, released in 1974.

Shima at that time developed several Intel peripheral croak review, some used in the IBM PC, such as the 8259interrupt controller, 8255 programmable peripheral port chip, 8253 timer chip, 8257direct memory access (DMA) chip jaunt 8251serial communicationUSART chip. He at that time joined Zilog, where he impressed with Faggin to develop depiction Zilog Z80 (1976) and Z8000 (1979).^[2]

Early life and career

He attacked organic chemistry at Tohoku Founding in Sendai, Miyagi Prefecture, Archipelago.

With poor prospects for custom in the field of immunology, he went to work particular Busicom, a business calculator constructor, joining in Spring 1967. Apropos, he learned about software innermost digital logic design, from 1967 to 1968.^[3]

Intel 4004

After Busicom sure to use large-scale integration (LSI) circuits in their calculator concoctions, they began work on what later became known as say publicly "Busicom Project",^[5] a chipset espouse the Busicom 141-PF calculator delay led to creating the have control over microprocessor, the Intel 4004.^[4] Wealthy April 1968, Shima was voluntarily to design the logic intolerant what was intended to transform a future chipset to make ends meet designed and produced by undiluted semiconductor company.^[3] Shima designed undiluted special-purpose LSI chipset, along be in keeping with his supervisor Tadashi Tanba, set a date for 1968.^[4] His design consisted do in advance seven LSI chips, including uncluttered three-chip CPU.^[5] Shima's initial base included arithmetic units (adders), number units, registers, read-only memory, queue a macro-instructionset to control capital decimal computer system.^[4] Busicom called for to produce a general-purpose LSI chipset, for not only background calculators, but also other press such as a teller pc, cash register and billing transactions.

Shima began work on marvellous general-purpose LSI chipset in derisory 1968, and Busicom then approached the American companies Mostek allow Intel for converting the deduction into MOS circuits and depiction chip's layout for manufacturing. Excellence job was given to Intel, who back then was extra of a memory company scold had facilities to manufacture honesty high density silicon gate metal–oxide–semiconductor (MOS) chip Busicom required.^[3]

Shima went to Intel in June 1969 to present the proposal.

Oral exam to Intel lacking logic engineers to understand the logic schematics or circuit engineers to alter them, Intel asked Shima pay homage to simplify the logic.^[6][3] Intel desired a one-chip CPU design,^[3] awkward by Sharp's Tadashi Sasaki who had presented the concept be determined Intel in 1968.^[7] This was then formulated by Intel's Marcian "Ted" Hoff in 1969, simplifying Shima's initial design down get tangled four chips, including a one-chip CPU.^[5] Due to Hoff's organization lacking key details, Shima came up with his own burden to find solutions for well-fitting implementation.

They both eventually authentic the 4-bit microprocessor concept, collide with the help of Intel's Discoverer Mazor to interpret the essence of Shima and Hoff. Shima was responsible for adding pure 10-bit static shift register put the finishing touches to make it useful as unblended printer's buffer and keyboard port, many improvements in the sayso set, making the random-access fame (RAM) organization suitable for copperplate calculator, the memory address expertise transfer, the key program come out of an area of performance dowel program capacity, the functional particularizing, decimal computer idea, software, screen calculator logic, real-time input/output (I/O) control, and data exchange pedagogy between the accumulator and beneficial register.^[3] The specifications of authority four chips were developed handing over a period of a occasional months in 1969, between set Intel team led by Hoff and a Busicom team saddened by Shima.^[5]

After Shima went stalemate to Japan in late 1969 and then returned to Intel in early 1970, he override that no further work confidential been done on the 4004 since he left, and divagate Hoff was no longer exploitable on the project.

The plan leader had become Federico Faggin, who had only joined Intel a week before Shima alighted. Faggin was hired from Fairchild Semiconductor, where he had educated the original MOS silicon weigh up technology, the only technology desert could be used to coin a chip of the convolution and speed of the 4004. Shima worked with him, conducive him with the logic base the 4004 processor ^[3] Forbidden worked at the Intel company for six months, from Apr until October 1970.

His classify then sold the rights competent use the 4004 to Intel, with an exception for permissive in business calculators.

Intel 8080 to Zilog Z8000

After the 4004, Intel designed the 8008 (architecture by Computer Terminal Corporation, contemplate by Federico Faggin and Unwind Feeney). Shima then joined Intel in 1972.^[2] He was tied up to implement the transistor-level deduce of Intel's next microprocessor, which became the Intel 8080 (conception and architecture by Federico Faggin), released in 1974.^[3] Shima at that time developed several Intel peripheral stopping, some used in the IBM PC, such as the 8259interrupt controller, 8255parallel port chip, 8253 timer chip, 8257DMA chip shaft 8251serial communicationUSART chip.^[2] He was not involved in the cult of the Intel 8088 drink 8086.

Shima moved to Zilog in 1975 and, using unique a few assistants,^[8] developed high-mindedness transistor-level and physical implementation observe the Zilog Z80, under prestige supervision of Faggin, who planned and designed the Z80 makeup to be an instruction buried compatible with the Intel 8080.

This was followed by prestige same task for the 16-bitZ8000.^[3]

According to coworkers from Intel, Faggin's method that Shima used was to design all logic habit the transistor level, directly wallet manually, not at the look into and/or register level. The schematics were thus hard to peruse, but as transistors were tattered in such a way put off they suggested a "floorplan" show the chip,^[9] it helped as making the physical chip combination.

However, according to Shima, honesty logic was first tested proceed breadboards using transistor–transistor logic (TTL) chips, before being manually translated into MOS transistor equivalents.

After returning to Japan, Shima supported the Intel Japan Design Affections in 1980, and VM Study Corporation in 1986.

At VM, he developed the 16-bit microprocessor VM860 and 32-bit microprocessor VM 8600 for the Japanese term processor market. He became a-ok professor at the University center Aizu in 2000.^[2]

Prizes

Notes

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