There are more than a few. What others are out there?
Evolution of Operating Systems
to quote How Things Work
At the simplest level, an operating system does two things:
1. It manages the hardware and software resources of the computer system. These
resources include such things as the processor, memory, disk space, etc.
2. It provides a stable, consistent way for applications to deal with the hardware
without having to know all the details of the hardware.
Operating Systems you might be familiar with:
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© R.E. Bergquist