caption: OS history In the very beginning... --OS was just a library of code that you linked into your program; programs were loaded in their entirety into memory, and executed --interfaces were literally switches and blinking lights And then came batch systems --OS was stored in a portion of primary memory --OS loaded the next job into memory from the card reader job gets executed output is printed, including a dump of memory repeat... --card readers and line printers were very slow so CPU was idle much of the time (wastes $$)
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