Differentiate analog computer with digital computer. What is CPU and how its works? What does an instruction cycle in CPU consists of?

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Suresh Chand · Accepted Answer

The difference between analog and digital computer are S.No. ANALOG COMPUTER DIGITAL COMPUTER 01. Analog computers works with continuous values or these types of systems process continuous data. Digital computers works with discrete values or these types of systems process discrete data. 02. Speed of analog computers is less than the digital computers. Speed of digital computers is more than the analog computers. 03. Analog computer has very low or limited memory and it can store less amount of data. Digital computer has very big memory it can store large amount of data. 04. Analog computer has no state. Digital computer has On and Off these 2 steps. 05. Analog computers are less reliable than digital computers. Digital computers are more reliable than analog computers. 06. Its performance is comparatively low. Its performance is very high. 07. Its speed of processing is not so high. Its speed of processing is very high. 08. Analog computers depends upon physical variations. Digital computers does not depend upon physical variations. 09. It provides results with less accuracy as compared to digital computers. It provides results with higher accuracy as compared to analog computers. 10. Analog computers are difficult to use. Digital computers are not so difficult to use. 11. Analog computers have complex architecture. Digital computers do not have so complex architecture like analog computers. 12. Readability of analog computer is low. Readability of digital computer is high. 13. Analog computers show the result in terms of voltage signals. Digital computers show the result in computer display screen. 14. Analog computers employs analog encoding. Digital computers employs digital encoding. 15. Power consumption is high. Power consumption is low. 16. They are usually special purpose devices. It can be general purpose devices. 17. Examples includes analog clock and thermometer etc. Examples includes Digital laptop, digital camera, digital watches etc. CPU is known as central processing unit.  A CPU is an electronics circuit used in a computer that fetches the input instructions or commands from the memory unit, performs arithmetic and logic operations and stores this processed data back to memory. Component of CPU: Control Unit The Control Unit is an internal part of a CPU that co-ordinates the instructions and data flow between CPU and other components of the computer. It is the CU that directs the operations of a central processing unit by sending timing and control signals. Arithmetic Logic Unit The ALU is an internal electronic circuitry of a CPU that performs all the arithmetic and logical operations in a computer. The ALU receives three types of inputs. Control signal from CU ( Control Unit ) Data(operands) to be operated Status information from operations done previously. When all the instructions have been operated, the output that consists of data is stored in memory and a status information is stored in internal registers of a CPU. Working of CPU: All the CPUs regardless of their origin or type performs a basic instruction cycle that consists of three steps named Fetch, decode and Execute. 1.Fetch A program consists of a number of instructions. Various programs are stored in memory. During this step, the CPU reads instruction that is to be operated from a particular address in the memory. The program counter of CPU keeps the record of address of the instructions. 2. Decode A circuitry called instruction decoder decodes all the instructions fetched from the memory. The instructions are decoded to various signals that control other areas of CPU. 3. Execute In the last step, the CPU executes the instruction. For example, it stores a value in the particular register and the instruction pointer then points to other instruction that is stored in next address location. source: it4nextgen

Differentiate analog computer with digital computer. What is CPU and how its works? What does an instruction cycle in CPU consists of?

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Differentiate analog computer with digital computer. What is CPU and how its works? What does an instruction cycle in CPU consists of?

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