1940
1950
1960
1970
1980
1990
2000
Vacuum tube
Transistor
Large scale integration - 1971-1977
3 – 100K devices on a chip, semi conductor memory
Very large scale integration - 1978 to date
100K – 100M devices on a chip
Ultra large scale integration
Over 100M devices on a chip
Small scale integration - 1965 on
Up to 100 devices on a chip
Medium scale integration - to 1971
100-3,000 devices on a chip
Generations of Computer