History might not work with big descrete steps, but it is probably the easiest way of getting to know it. Heres some of the more important milestones in the history of computing as seen from Stacken.
1997: Arla
1996: Ultra
1994: 4.4BSD-Lite
1994: FreeBSD 2.0
1993: FreeBSD 1.0
1993: Early arla
1990: Commersial AFS
1989: Pizzabox computer
1987: 2.10BSD
1986:
RMS @ Stacken
1984: The X Window System
1984: Andrew File System developement starts
1983: Commodere 64
1982: Vic-20
1982: Sun incorporated
1980: 4.0BSD
1978:
Stacken founded
1978: 2BSD
1977:
VAX 11/780
1975:
Plans for VAX
1972:
KI10
1972:
More PDPs
1970:
PDP-11/20
1948: A Mathematical Theory of Communication
1946: Eniac
1941: Konrad Zuse