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Masatoshi Shima (嶋正利 Shima Masatoshi, born on August 221943 in Shizuoka, Japan) was the designer of the world's first microprocessor, the Intel 4004.
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. There, he learned about software and digital circuit design. When Busicom decided to use LSI circuits in their calculator products, they approached the American companies Mostek and Intel for manufacturing help. The job was given Intel, who back then was more of a memory company and had facilities to manufacture the high density silicon gate MOS chip Busicom required. Masatoshi Shima ultimately designed the 4004 processor where he worked at Intel offices with Marcian "Ted" Hoff and Federico Faggin. His company then sold the rights to use the 4004 to Intel (with the exception of use in business calculators).
According to co-workers from Intel, Shima designed all logic at the transistor level manually. The transistors were drawn in such way that they already included the "floorplan" of the chip.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Masatoshi_Shima". A list of authors is available in Wikipedia.|