About Masatoshi Shima
Masatoshi Shima (嶋 正利, Shima Masatoshi; born August 22, 1943) is a Japanese electronics engineer. He 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. In 1969, he worked with Intel's Ted Hoff and Stanley Mazor to reduce the three-chip Busicom proposal into a one-chip architecture. In 1970, that architecture was transformed into a silicon chip, the Intel 4004, by Federico Faggin, with Shima's assistance in logic design. He later joined Intel in 1972. There, he worked with Faggin to develop the Intel 8080, released in 1974. 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 (DMA) chip and 8251 serial communication USART chip. He then joined Zilog, where he worked with Faggin to develop the Zilog Z80 (1976) and Z8000 (1979). 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 1980, and VM Technology Corporation in 1986.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.