The S-810, first announced in August 1982, was the second Japanese supercomputer, following the Fujitsu VP-200 (July 1982) but predating the NEC SX-2 (April 1983).
The first system shipped was a top-end S-810/20 model, which was delivered to the University of Tokyo's Large Computer Center in October 1983.
The scalar processor is a Hitachi HITAC M-280H mainframe with a 28 nanosecond (ns) cycle time (clock rate of approximately 35.71 MHz).
The vector processor has a 14 ns cycle time (clock rate of approximately 71.43 MHz).
These registers are implemented with 1 kilobit (Kbit) bipolar RAM integrated circuits (ICs) with a 4.5 ns access time.