Parametron

Japan has been good at computers for a long time. In 1954, Eiichi Goto invented the parametron, a logic device leveraging nonlinear parametric oscillation with two ferrite cores [and] in 1957, Goto led the development of the PC-1, a pioneering fully programmable stored-program computer powered by 4,200 parametrons. … Unlike the complex, maintenance-intensive vacuum tube computers of the era…