Data ProcessingLesson 3

3-1 The History of Computers3-2 The Earliest Computing Devices 1. Abacus 2. Napier’s Bones

3. Oughtred’s slide rule 4. Pascal’s Calculator

5. Leibnir’s Calculator 6. Babbage’s analytical Engine

7. Hollerith’s Punched-card Machine

3-1 History of Computers

Historical records will tell us that man has invented three types of devices to assist him in calculating and processing data. They are: Manual mechanical Eletromechanical Electronic

Manual-mechanical : A simple mechanism powered by hand Abacus Slide rule

Electromechanical: It is usually powered by an electric motor and uses switches and relays. Household electrical appliances Calculators Punched cards

Electronic : a device which has its principal components circuit boards, transistors or silicon chips and the like Modern digital computer

3-2 The Earliest Computing Devices

1. Abacus

3-2 The Earliest Computing Devices

2. Napier’s Bones

3-2 The Earliest Computing Devices

3. Oughtred’s Slide Rule

3-2 The Earliest Computing Devices

4. Pascal’s Calculator

3-2 The Earliest Computing Devices

5. Leibniz’s Calculator

3-2 The Earliest Computing Devices

6. Babbage’s Analytical Calculator

3-2 The Earliest Computing Devices

7.Hollerith’s Punched-card Machine