CLASSIFICATIONS OF COMPUTER (BY TYPE)

SS1 DATA PROCESSING NOTE (SECOND TERM TOPIC ONE) 

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Computers are classified according to : 

•  Type ( of data processed) 
• Purpose or functionality 
• Size 

 Classification by Type 

• Analog 
• Digital 
• hybrid

Analog computer

Analog computer are computers that operate on continuous data through measuring physical quantities like temperature, voltage, speed, current, pressure etc. Analog computer operates by measuring rather than counting. Analog computers are based on analog signal that is continuous in nature. 

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Presley is an example of analog computer. Other examples of analog devices are thermometer, speedometer, voltmeter, barometer, analog clock etc. 

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Digital computer

Digital computer works on discrete data or discontinuous data. It accepts data as digits or numbers and processes it with programs stored in the memory to produce desired output. Digital computer works on a binary system where 0 represents off and 1 represents on. It is based on digital signals i.e discrete signals. 

 Examples of digital computers include: smart phones, smart watches, laptops, desktop computers etc. 

  Hybrid Computer

Hybrid computer combines the features of both analog and digital computers. It can perform the tasks of both analog and digital computers. The hybrid computer can convert the analog signal into digital signals and digital signal into the analog signal.

Examples of hybrid computers are fuel pumps dispenser, ECG machine, monitoring systems in the hospital etc. 

 Hybrid computers are also widely used in the following applications such as: 

• Airline systems 
• Defense sector 
• Radar systems 
• Ships 
• Monitoring and controlling nuclear reactors etc. 

 Differences between analog and digital computers 

•  Analog computer displays data in continuous form while digital computer displays data in discrete form 
• Analog computer operates by measuring while digital computer operates by counting and calculating 
• Accuracy is low in analog computer but high in digital computer 
• Analog computer has little or no storage capacity while digital computers has large storage capacity. 

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