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Memory

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Memory

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    1. Memory

    2. Units of Memory The amount of data and instructions a computer can store in its memory are measured in bytes One byte contains 8 bits (a binary digit-0 or 1) A single character can be stored in one byte Units are usually measured in terms of KB, MB or GB

    3. Units of Memory & Storage

    4. Memory Memory can be volatile or non-volatile Volatile memory Data is lost when the power is turned off Non-volatile Memory does not lose data when the power is turned off

    5. Memory The computer has two main types of memory: Random Access Memory (RAM) Read Only Memory (ROM)

    6. RAM (Random Access Memory) RAM is held on a computer chip You can write data into RAM and also read data from RAM RAM is volatile memory RAM needs power. If the power is switched off the data in RAM disappears RAM holds data and programs

    7. ROM (Read-Only Memory) ROM is held on a computer chip ROM cannot be altered by the user You cannot store your own data on ROM ROM is used to hold the instructions for starting up the computer ROM is non-volatile memory

    8. Cache A "cache" is also used by the CPU itself to hold data from main memory (RAM)  as this is much, much faster to use. It allows instructions to be carried out at very high speeds

    9. Printer Buffers Printer Buffer When jobs are sent to the printer by a computer they cannot be printed all in one go Instead a buffer is used where the print jobs wait until the printer can deal with them The printer acts as a “waiting room” and frees the computer to get on with other tasks

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