Hitachi HIPAC 103

This machine was developed as a computer for sophisticated scientific and engineering computations, suitable for the economic power load distribution equipment of Kansai Electric Power. It used parametrons as its main arithmetic-logic element, and primarily magnetic core for memory. It was also equipped with a magnetic drum. For data, the system used 48-bit binary words, and for instructions it used the paired order system where 2 instructions were incorporated into a single word. The address part was 13-bits, thus enabling addressing of 8,192 words of memory. The instruction set was extremely comprehensive for the time, and was comprised of 110 different types of instructions, including the floating point instructions necessary for scientific and engineering calculations.