1964	the 3rd-generation computer IBM Ssytem/360 was introduced

1969	Ken Thompson was beginning the design of the UNIX operation system.

1971	UNIX started to use.

1972	Dennis Ritchie start to develop C language at Bell Labs
	Rewrote UNIX in C. 

1977	Apple II was first introduced by Steven Jobs and Steve Wozniak.

1981	1st IBM PC (4th-generation) is developed.

1997	Kevin's virus history presentation