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During the mechanical and electric analog phases of technology, information was created by a series of physical changes converted into electrical impulses for storing and  machine, and each analog information storage required a specialized equipment to decode and read the information. A cassette player or a gramaphone disc is an example of such a device.  Analog machines could be programmed for specific applications as well as for general computing.  Since information was being represented physically, results were not always accurate as they could not be replicated exactly.Such a device is called an [[wikipedia:Analog_computer|analog computer.]]   

During the mechanical and electric analog phases of technology, information was created by a series of physical changes converted into electrical impulses for storing and  machine, and each analog information storage required a specialized equipment to decode and read the information. A cassette player or a gramophone disc is an example of such a device.  Analog machines could be programmed for specific applications as well as for general computing.  Since information was being represented physically, results were not always accurate as they could not be replicated exactly.Such a device is called an [[wikipedia:Analog_computer|analog computer.]]