Masatoshi shima biography sampler
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About Masatoshi Shima
Masatoshi Shima is an electronics engineer whose work on the 4004 at Busicom and on the 8000 and 8008 at Intel and Zilog made important contributions to the development of the microprocessor. Shima received a bachelor's degree in organic chemistry from Tohoku University, and from there began work at Busicom, moving from their business software division to hardware. By 1968 he was working to combine software and hardware concerns in the development of the desktop calculator. After working with Mostek and Intel on the development of the 4004, in 1969 Shima went to the United States to work with Intel; he collaborated with Stan Mazor and Ted Hoff. Their combined skills facilitated the development of 4001, 4002, 4003, and 4004; the four designs were finalized by the end of 1969. In 1970 Shima went back to Japan and worked with production of the 4004 there. He then went to work for Ricoh in their business computing department until moving to Intel where worked on
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The Busicom 141-PF calculator and the Intel 4004 microprocessor
The fascinating story of why the development of a calculator led to the development of the first commercial microprocessor, and the unexpected consequences.
© 2009 Nigel Tout
This is a new article which was not originally in "The International Calculator Collector".
Busicom Corporation
One of the most technologically adventurous calculator manufacturers in the late 1960s and early 1970s was the small Japanese company Busicom Corporation. Under its previous name of Nippon Calculating Machine Corporation (NCM) it produced mechanical pinwheel calculators in the mid-1960s.
In the second half of the 1960s Busicom developed and marketed an advanced series of electronic desktop calculators. During this time calculator electronics was at the leading edge of semiconductor development and, like other companies, Busicom took advantage of these developments which increased the number o