PERSONAL COMPUTER

What is a PC?
IBM invented the PC (Personal Computer) way back in 1981. All PCs released since then are in many ways compatible with the original design, though many extensions have been made. 
The term PC compatible relates to PCs manufactured by companies other than IBM which are compatible with the traditional PC specification. 
In the early days, most PCs ran an operating system called DOS (Disk Operating System). These days most PCs will be running a version of Microsoft Windows.

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