2. Mechanical age
Invention of abacus, the first
mechanical calculator in 500 BC
Blaise Pascal's invention of mechanical calculator constructed of
gears and wheels in 1642.
Programmable calculating
machine, which was known
as Analytical Engine was
proposed by Charles Babbage
in 1823
Fig.1.Abacus
Fig2.Analytical engine
3. Electrical age
The first electronic calculating
machine, the Z3, was invented
by Konrad Zuse in 1941
The first general purpose
programmable electronic
computer system, ENIAC
(Electronics Numerical
Integrator and Calculator)
was developed in1946
Fig4.The Z3
Fig5..ENIAC
5. Intel 4004
World’s First microprocessor
Year of introduction: 1971
4 bit memory location
45 instructions
PMOS technology
Targeted use: Calculators
Fig6.Intel4004
6. Intel 8085
Year of introduction:1975
8 bit microprocessor
64 kb main memory
1.3 microseconds clock cycle
246 instructions
Uses only +5v power supply
7. Intel 8086/8088
Year of introduction :
1978 for 8086 and
1979 for 8088
16 bit microprocessor
1 mb main memory
400 nanosecond clockcycle time
More registers and editional instruction
In 1991 IBM decided to use
it in its persona; computer
8. Intel 80386
Year of introduction:1986
4 GB main memory
Page handling in virtual machine
Includes hardware circuitry for memory management
and memory assignment
Memory paging and enhanced I/O operation
9. Intel 80486
Year of introduction : 1989
32 bit microprocessor
4 GB main memory
8K byte catch on one package
About half of the instructions
executed in 1 clock cycle,
instead of 2 on 80386
10. Pentium
Year of introduction :1993
32 bit microprocessor,64 bit microprocessor
And 32 bit address bus
4GB main memory
Double clocked 120 and 133MHz version
Fastest version is the 233 MHz, Dual Integer
processor
11. Pentium Pro
Year of introduction :1995
32 bit microprocessor
64 GB main memory,64 bit data bus and 36 bit
address bus
Uses three execution engine
Intel launched this for server market
12. Pentium Xeon
400 MHz Pentium processor for use in workstations
and enterprise servers.
Designed for multimedia applications, engineering
graphics, Internet and large data base servers.