PLS 21 Lecture Notes - Lecture 5: Hard Disk Drive, Hyper-Threading, Dynamic Random-Access Memory
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The first software you see when you turn on the computer, and the last software you see when you turn the computer off. Manage the hardware and software resources of the computer system. These resources include such things as the cpu processor, memory, disk space, etc. Provide a stable, consistent environment for applications to deal with the hardware without having to know all the details of hardware (interface, drivers) The os mediates interactions among both internal and external components. Each component may be "talking" a different language and having different requirements. The os acts as a traffic cop, a translator, and a resource manager. Computers can only execute code found in memory (rom or (ram). When a computer is turned on, it does not have an operating system in memory. The computer"s hardware cannot perform complex actions such as loading a program from disk, so an apparent paradox exists:
