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Concurrent
I/O and programs
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SPOOL-ing
(Simultaneous Peripheral Operation On Line)
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Allows
direct input & output
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Multiple
programs resident in memory at once
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Keeps
processor busy
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On-line
file storage
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Some
support for terminals, telecommunications
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Early
business computers
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E.g.,
IBM 7070, IBM 360 & 370
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Scientific
computing
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E.g.,
Control Data 6600, IBM 360/91
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