Before revision: 1950s 1951 LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co. 1955 General Motors Operating System made for IBM 701 MIT's Tape Director operating system made for UNIVAC 1103Douglas Ross.
After revision: 1953 DYSEAC - an early machine capable of distributing computing1950s 1951 LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co. 1955 General Motors Operating System made for IBM 701 MIT's Tape Director operating system made for UNIVAC 1103Douglas Ross.