Alan Turing Machine - Can Perform perform any computation that a real computer can , Vacuum tubes - are electrical devices that control the flow of electricity., Transistors - replaced the vacuum tube and are very small electronic switches , Integrated circuits - consists of a number of electronic circuits all on a single semiconductor or "chip"., Microprocessors - Now what is called a CPU and is a device that takes binary input data from instructions stored in memory and provide the result as a output., Software - is the general term used to describe programs/instructions that are executed by the processor, Hardware - physical components of a computer system-computer components, Software Example  - word, chrome, windows, skype, Hardware Example - memory, storage devices, printer, screen, mouse., Digital input, Have two discrete values (1/0 or ON/OFF)., Analogue input: Have any value within a certain range,Values continuously vary.,

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