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Japanese electronics engineer

Professor Masatoshi Shima
at the Computer History Museum Fellow Awards event
Born	() August 22, (age&#;81) Shizuoka, Shizuoka Prefecture, Japan
Citizenship	Japan
Education	B.S., Tohoku University () , Tsukuba University ()
Known&#;for	Microprocessors: Intel , , Zilog Z80, Z Peripheral chips: Intel , , , ,
Awards	Kyoto Prize () Computer History Museum Fellow ()[1]
Scientific career
Fields	Electronic engineering Microprocessor
Institutions	Busicom () Intel (, ) Zilog ()[2] VM Technology () University of Aizu ()

Masatoshi Shima (嶋 正利, Shima Masatoshi, born August 22, , Shizuoka) is a Japanese electronics engineer.

Masatoshi shima biography template pdf Masatoshi Shima (嶋 正利, Shima Masatoshi, born August 22, , Shizuoka) is a Japanese electronics engineer. He was one of the architects of the world's first microprocessor, the Intel In , 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 In , Shima worked for Busicom in Japan, and did the logic design for a specialized CPU to be translated into three-chip custom chips. In , he worked with Intel's Ted Hoff and Stanley Mazor to reduce the three-chip Busicom proposal into a one-chip architecture. In , that architecture was transformed into a silicon chip, the Intel , by Federico Faggin, with Shima's assistance in logic design.^[3][4][5]

He later joined Intel in There, he worked with Faggin to develop the Intel , released in Shima then developed several Intel peripheral chips, some used in the IBM PC, such as the interrupt controller, programmable peripheral interface chip, timer chip, direct memory access (DMA) chip and serial communicationUSART chip.

He then joined Zilog, where he worked with Faggin to develop the Zilog Z80 () and Z ().^[2]

Early life and career

He studied organic chemistry at Tohoku University in Sendai, Miyagi Prefecture, Japan.

Biography template free Masatoshi Shima is a Japanese electronics engineer, who was one of the designers of the world"s first microprocessor, the Intel , along with Federico Faggin, Ted Hoff, and Stanley Mazor. He studied organic chemistry at Tohoku University in Sendai, Japan.

With poor prospects for employment in the field of chemistry, he went to work for Busicom, a business calculator manufacturer, joining in Spring There, he learned about software and digital logic design, from to ^[3]

Intel

After 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",^[5] a chipset for the Busicom PF calculator that led to creating the first microprocessor, the Intel ^[4] In April , 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.^[3] Shima designed a special-purpose LSI chipset, along with his supervisor Tadashi Tanba, in ^[4] His design consisted of seven LSI chips, including a three-chip CPU.^[5] Shima's initial design included arithmetic units (adders), multiplier units, registers, read-only memory, and a macro-instructionset to control a decimal computer system.^[4] 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 began work on a general-purpose LSI chipset in late , and Busicom then approached the American companies Mostek and Intel for converting the logic into MOS circuits and the chip's layout for manufacturing. 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.^[3]

Shima went to Intel in June 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.^[6][3] Intel wanted a one-chip CPU design,^[3] influenced by Sharp's Tadashi Sasaki who had presented the concept to Intel in ^[7] This was then formulated by Intel's Marcian "Ted" Hoff in , simplifying Shima's initial design down to four chips, including a one-chip CPU.^[5] Due to Hoff's formulation lacking key details, Shima came up with his own ideas to find solutions for its implementation.

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They both eventually realized the 4-bit microprocessor concept, with the help of Intel's Stanley Mazor to interpret the ideas of Shima and Hoff. Shima was responsible for adding a bit static shift register to make it useful as a printer's buffer and keyboard interface, many improvements in the instruction set, making the random-access memory (RAM) organization suitable for a calculator, the memory address 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 input/output (I/O) control, and data exchange instruction between the accumulator and general-purpose register.^[3] The specifications of the four chips were developed over a period of a few months in , between an Intel team led by Hoff and a Busicom team led by Shima.^[5]

After Shima went back to Japan in late and then returned to Intel in early , he found that no further work had been done on the 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 Shima worked with him, assisting him with the logic design the processor ^[3] He worked at the Intel offices for six months, from April until October His company then sold the rights to use the to Intel, with an exception for use in business calculators.

Intel to Zilog Z

After the , Intel designed the (architecture by Computer Terminal Corporation, design by Federico Faggin and Hal Feeney). Shima then joined Intel in ^[2] He was employed to implement the transistor-level logic of Intel's next microprocessor, which became the Intel (conception and architecture by Federico Faggin), released in ^[3] Shima then developed several Intel peripheral chips, some used in the IBM PC, such as the interrupt controller, parallel port chip, timer chip, DMA chip and serial communicationUSART chip.^[2] He was not involved in the creation of the Intel or

Shima moved to Zilog in 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 This was followed by the same task for the bitZ^[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.

Masatoshi shima biography template Masatoshi Shima (嶋 正利, Shima Masatoshi, born August 22, , Shizuoka) is a Japanese electronics engineer. He was one of the architects of the world's first microprocessor, the Intel In , Shima worked for Busicom in Japan, and did the logic design for a specialized CPU to be translated into.

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 , and VM Technology Corporation in At VM, he developed the bit microprocessor VM and bit microprocessor VM for the Japanese word processor market. He became a professor at the University of Aizu in ^[2]

Prizes

Notes

External links