$$:$-.1$ RAM $?$ What is the purpose of RAM in a computer system? $.2?$ What are the capabilities and limitations of computer? $.3$ What is a barcode and how does it work? $.4$ Input Devices $-$ Explain the input devices in computers? $.5$ Explain the system software and application software? $.6?$ Explain the types of virus in computer? $.7$ Commands $?$ Explain the Internal commands in computer? $.8$