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Following the decision to produce IBSYS/IBJOB for the 7090/94, it was decided to implement a similar system for the 7040/44. The transfer of a system of the size and complexity of IBSYS/IBJOB to another machine required a re-evaluation of all parts of the system and considerable new design work. Although generally the 7040/44 Operating System is externally compatible with the 7090/94 IBSYS/IBJOB system, there are significant differences in the internal structure. This paper describes the 7040/44 Operating System as well as the differences between this system and the 7090/94 IBSYS/IBJOB system.
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