16 Facts About Masatoshi Shima

Masatoshi Shima is a Japanese electronics engineer.

Masatoshi Shima was one of the architects of the world's first microprocessor, the Intel 4004.

In 1968, Shima worked for Busicom in Japan, and did the logic design for a specialized CPU to be translated into three-chip custom chips.

Masatoshi Shima then developed several Intel peripheral chips, some used in the IBM PC, such as the 8259 interrupt controller, 8255 programmable peripheral interface chip, 8253 timer chip, 8257 direct memory access chip and 8251 serial communication USART chip.

Masatoshi Shima then joined Zilog, where he worked with Faggin to develop the Zilog Z80 and Z8000.

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

Masatoshi Shima designed a special-purpose LSI chipset, along with his supervisor Tadashi Tanba, in 1968.

Masatoshi Shima's design consisted of seven LSI chips, including a three-chip CPU.

Masatoshi Shima began work on a general-purpose LSI chipset in late 1968, and Busicom then approached the American companies Mostek and Intel for converting the logic into MOS circuits and the chip's layout for manufacturing.

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

Masatoshi Shima worked with him, assisting him with the logic design the 4004 processor He worked at the Intel offices for six months, from April until October 1970.

Masatoshi Shima was employed to implement the transistor-level logic of Intel's next microprocessor, which became the Intel 8080, released in 1974.

Masatoshi Shima then developed several Intel peripheral chips, some used in the IBM PC, such as the 8259 interrupt controller, 8255 parallel port chip, 8253 timer chip, 8257 DMA chip and 8251 serial communication USART chip.

Masatoshi Shima was not involved in the creation of the Intel 8088 or 8086.

Masatoshi Shima moved to Zilog in 1975 and, using only a few assistants, 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 8080.

Masatoshi Shima became a professor at the University of Aizu in 2000.