IBSYS is a discontinued tape based operating system that IBM supplied with its IBM 709, IBM 7090 and IBM 7094 computers, alongside a significantly different though similar system for the IBM 7040 and IBM 7044. It was based on the FORTRAN Monitor System and Bell Labs' BESYS rather than the SHARE Operating System, and it directly supported several older language compilers and assemblers through its EXECUTE card, while newer language processors ran under IBJOB. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Wikipedia: IBM 7090/94 IBSYS
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IBSYS is a discontinued tape based operating system that IBM supplied with its IBM 709, IBM 7090 and IBM 7094 computers, alongside a significantly different though similar system for the IBM 7040 and IBM 7044.
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