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IBM 7090/94 IBSYS
IBSYS is the discontinued tape based operating system that IBM supplied with its IBM 7090 and IBM 7094 computers. A similar operating system (but with several significant differences), also called IBSYS, was provided with IBM 7040 and IBM 7044 computers. IBSYS was based on FORTRAN Monitor System (FMS) and SHARE Operating System.
IBSYS itself was really a ''basic monitor'' program, that read control card images placed between the decks of program and data cards of individual jobs. An IBSYS control card began with a "$" in column 1, immediately followed by a ''Control Name'' that selected the various IBSYS utility programs needed to set up and run the job. These card deck images were read from magnetic tapes, prepared offline, not usually directly from the punched card reader.
==See also==
* University of Michigan Executive System
* Timeline of operating systems
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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