Invention System
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How were instructions given to CPU of computer before invention of disc operating system was invented?
were the electrical engineers and scientists manually loading instructions in machine language?
Before the hard disk there was the floppy disk.
Before that there was magnetic tape in various formats, for example, audio cassettes, that were used to enter and store data.
Before that there was paper tape. I did a lot of programming on PDP8 systems which used paper tape.
And before that you entered data via mechanical switches of some sort or other. Plugs and jacks were also used, such as you see in old telephone switch panels.
Somewhere in between there were ROM operated systems, with the operating system on ROMs.
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