An Operating Systems is the Core Software Piece dedicated to run Software on some Hardware.
Most OS are Unix based like :
GNU/Linux BSD Hurd AmigaOS, MacOS X … others are MSDOS, Windows etc
@tag: Floppy
Once I wanted to make a MP3 player or MultiMediaHardware on a 486 box, it will be funny to know what can run on pre pentiums PC
A Sysadmin's Unixersal Translator (ROSETTA STONE) OR What do they call that in this world?