BESYS

BESYS, the Bell Operating System, was an early batch-processing operating system Bell Labs built in 1957 for the IBM 704, created by George H. Mealy and Gwen Hansen with Wanda Lee Mammel to close the gap between the 704's fast processor and the slower unit-record equipment and manual operation around it. The name combines Bell Labs' SHARE installation code, BE, with SYS for systems software, and the first version, BESYS-1, was running by October 16, 1957. Later versions carried the system through the IBM 709X family of computers until Bell Labs moved to the IBM System/360 in 1969, and a final BE90 release appeared in 1968. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/