3. MECHANICAL PERIOD
Started around 1450-1840
Machines driven by mechanical mean dominated
information processing & calculation
Pascaline by Blaise Pascal & the analytical engine by Charles
Babbage (father of computer)
4. ELECTROMECHANICAL
PERIOD
Started around 1840-1940
The use of electricity for information handling & transfer
bloomed
E.g 1837 Telegraph by William Cocks &sir Charles Wheatstone(5
magnetic needles) 1844 Samuel Morse(first single circuit) 1876
Telephone by Alexander Graham Bell
5. ELECTRONIC PERIOD
Started in the 1940’s
Focus on solid state devices late vacuum tubes transistors
integrated circuit computer processor electronic numerical integrator
and computer (ENIAC)
1947 the transistors similar to vacuum tubes
1957 first full transistors was developed
1958 jack kilby int integrated circuit(IIC)
