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Which/whose DOS? The earliest DOS that I know of was one of two very primitive operating systems developed by IBM in 1964-1965 for the System/360 because their planned operating system (which never did get finished to specification) was hopelessly behind schedule and overbudget. These were TOS (Tape Operating System) and DOS (Disk Operating System), both were simple batch job operating systems with only primitive multitasking ability (to prevent the computer from being idle when a program did I/O.).

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Damaris Hackett

Lvl 10
3y ago

What else can I help you with?