A relay-type scientific computer completed in 1957. After the completion of the FACOM128A, this computer was created to meet demands for more compact and economical scientific computers. It retained the fundamental strengths of the 128A, namely its functions for full self-inspection, retry functions, stability, program simplicity, and other characteristics, while reducing the size to 1/3 of its predecessor. It applied a portion of its unit intended for calculation of multiplication, division, and square roots to simple operations such as addition, subtraction, and discrimination. Its memory capacity was also compressed, allowing it to be used easily as a compact, all-purpose computer employing a floating-point system.