complement au ./66 :

http://en.wikipedia.org/wiki/Personal_computer

In their early years personal computer was interchangeable with Microcomputers and home computers. Often, the term "personal computer" is used exclusively for computers running the Microsoft Windows operating system, but this is erroneous.
For example, a Macintosh running Mac OS and an IBM PC compatible running Linux are both personal computers. This confusion stems from the fact that the term "PC" is often used as a shorthand form for "IBM PC compatible" and historically Mac OS has run on non-IBM compatible hardware like the PowerPC architecture. Newer personal computing devices have had their OS wars with WindowsCE struggling with PalmOS in the PDA markets and now the cell phone devices have gotten powerful enough to start a whole new struggle to define the personal computer, its operating system and how we use it in our daily lives.

edit: cross

* Il est incorrect d'utiliser "PC" (ou "IBM-PC" ou "PC compatible IBM" ou "PC x86") pour désigner l'ensemble matériel + un certain système d'exploitation comme c'est malheureusement souvent fait, on peut faire tourner d'autres systèmes d'exploitation et ce n'est pas ça qui n'en fera pas un PC.

Oui mais parler d'IBM-PC ou IBM-PC compatible est bcp plus juste que de juste utiliser le terme "pc"