【Fujitsu】 FACOM 230-60

This was a large general-purpose computer, which used ICs throughout, from Fujitsu. It was developed in March 1968. It not only had performance 4 to 10 times that of the previous FACOM 230-50 Model, but also enhanced online data processing capabilities. In order to achieve superior cost performance, this computer led the world in pioneering revolutionary new technology, using the multiprocessor (2 CPU) system and employing monolithic ICs throughout. The multiprocessor system in particular was comprised of multiple CPUs (2 CPUs in the case of the FACOM 230-60) which shared a main memory unit and input/output devices, and was fundamentally different from conventional composite computer systems. Thus the FACOM 230-60 pioneered a new era for large computers.

This computer employed a 20mil high-speed magnetic core memory unit with a maximum capacity of 262,144 words (42-bits per word, including 36 data-bits, 4 flag-bits and 2 parity-bits) and a cycle time of 0.92 microseconds, and a high-capacity magnetic core memory unit with a cycle time of 6 microseconds and a maximum of capacity of 786,432 words. Arithmetic speed performance was 1.26 microseconds /4.06 microseconds for fixed point addition-subtraction/multiplication, and 2.27 microseconds /3.68 microseconds for floating point addition-subtraction/multiplication.

As other features, the computer adopted the built-in hardware DIAC for diagnosing the processing unit itself, and a switching operation console for connecting and disconnecting units to and from the system. The FACOM 230-60 was highly praised from the time it was announced, and it built a position as the large computer among Fujitsu's computers. More than 130 units were shipped.

FACOM 230-60 SystemFACOM 230-60 CPUMagnetic core memory of FACOM 230-60Lower left : magnetic core memory plane with the size of 20 mil, used by FACOM 230-60 Upper : the enlargement by a magnifying glass (Exhibited in the Ikeda Toshio Memorial Room, Numazu Factory of Fujitsu)