•Vacuum tube - 1946-1957
•Transistor - 1958-1964
•Small Scale Integration - 1965 on
–Up to 100 devices on a chip
•Medium Scale Integration - to 1971
–100-3,000 devices on a chip
•Large Scale Integration - 1971-1977
–3,000 - 100,000 devices on a chip
•Very Large Scale Integration - 1978 to
date
–100,000 - 100,000,000 devices on a chip
•Ultra Large Scale Integration
–Over 100,000,000 devices on a chip
Pentium
Evolution
•8080
–first
general purpose microprocessor
–8
bit data path
–Used
in first personal computer – Altair
•8086
–much
more powerful
–16
bit
–instruction
cache, prefetch few instructions
–8088
(8 bit external bus) used in first IBM PC
•80286
–16 Mbyte memory addressable
–up
from 1Mb
•80386
–32
bit
–Support
for multitasking
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