Abstract
As we have previously mentioned, the computer itself is simply a collection of chips and circuit boards which are useless without software. Application software is what you do work with, i.e. your word processor or database etc, but the application software itself needs an operating system to run within. The operating system, however, needs something called a basic input/output system (BIOS) to operate. This is software but stored in ROM (Read Only Memory) on chips, and tells the computer what to do when it is first switched on.
Highlights
Think of the whole thing like layers: First layer
basic input/output system (BIOS): controls very basic computer functions, e.g. when there is no disc in a disc drive, the error message that appears has come from BIOS directly
Usually DOS; allows application programs to interact with the BIOS and the hardware such as monitor, disc drives, printer etc
Summary
Think of the whole thing like layers: First layer. The computer itself cannot do anything alone. Usually DOS; allows application programs to interact with the BIOS and the hardware such as monitor, disc drives, printer etc. If you have more than one disc drive, it may be called by another letter e.g. B: >.
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