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DOS: Disk Operating System

TOS: Tape Operating System, most likely came first.

It used 1/2 inch 7 channel tapes on computers without harddisks.

Before that IBM had a system called IBSYS on their 7090 & 7094 computers, but it was more of a Batch Monitor than a real Operating System (it only automatically ran jobs one after another in batches).

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Q: Which was the first computer operating system?
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