MS-DOS (Originally 86-DOS, from SCP and Tim Paterson) Xenix (purchased from AT&T, sold to SCO)
OS/2 (developed with IBM)
Windows 1.0 Windows 2.0 Windows 3.0 Windows 3.1 Windows...
1) To manage the memory 2) To manage the IO devices 3) To provide platform for interaction between computer & user 4) To mange the communication between devices & many more....
windows1.01(1985) was the first to released followed by windows1.01(1986),followed by windows 2.03(i987) followed by windows 3.0(1990) followed by windows3.1(1992) followed by windows NT 3. 1...