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Input/ Output

Input/ Output. By Mohit Sehgal. What is Input/Output of a Computer? Connection with Machine Every machine has I/O (Like a function)

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Input/ Output

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  1. Input/ Output By Mohit Sehgal

  2. What is Input/Output of a Computer? • Connection with Machine • Every machine has I/O (Like a function) • In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world possibly a human, or another information processing system.

  3. Uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. Keyboard

  4. Pointing device that functions by detecting two-dimensional motion relative to its supporting surface Mouse

  5. Interrupt I/O • Programmed I/O • DMA I/O (Direct Memory Access) Types of I/O

  6. In computing, an interrupt is an asynchronous signal indicating the need for attention or a synchronous event in software indicating the need for a change in execution. Interrupt I/O

  7. CPU does not need to wait • I/O Module interrupts when it is ready Interrupt I/O

  8. Method of transferring data between the CPU and a peripheral such as a network adapter or an ATA storage device • Happens when software running on the CPU uses instructions that access I/O address space Programmed I/O

  9. CPU has control over the I/O Downfall: Uses a lot of CPU time Programmed I/O

  10. Refers to data transfers initiated by a device to access system memory • Allows certain hardware subsystems within the computer to access system memory for reading and/or writing independently of the central processing unit Direct Memory Access I/O

  11. DMA controller takes over from CPU for I/O • DMA takes the load from the CPU DMA I/O

  12. CPU checks I/O module device status • I/O then returns its status • CPU requests data transfer if I/O is ready • I/O module gets data from device • Transfers it to CPU • Output Input/ Output Process

  13. I/O are getting more advanced • Now I/O are doing the entire transfer • This takes the strain off of CPU Input Output

  14. Future of I/O

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