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Ram & rom


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ram and rom

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Ram & rom

  1. 1. RAM & ROM Presented to: Mam Gulfishan Ahsan Rafiq Final (eve)
  2. 2. Objectives • Computer system • Essential computer hardware • RAM and ROM • Characteristics • Differences • References
  3. 3. Computer system • Hardware • Software • Data • User
  4. 4. Essential Computer Hardware 1. Processing devices 2. Memory devices 3. Input and output devices 4. Storage devices
  5. 5. Random Access Memory or RAM • RAM is the place in a computer where the operating system, application programs, and data in current use are kept so that they can be quickly reached by the computer's processor.
  6. 6. • RAM can be compared to a person's short-term memory and the hard disk to the long-term memory • A typical computer may come with 256 million bytes of RAM and a hard disk that can hold 40 billion bytes. • RAM comes in the form of "discrete" (meaning separate) microchips and also in the form of modules that plug into holes in the computer's motherboard.
  7. 7. Read-only memory or ROM • Read-only memory or ROM is a form of data storage in computers and other electronic devices that can not be easily altered or reprogrammed. • ROM in non-volatile and the contents are retained even after the power is switched off.
  8. 8. Characteristics RAM • RAM chip is used in the normal operations of a computer after starting up and loading the operating system. • Much faster to read from and write • Data in RAM stays there only as long as your computer is running • A RAM chip can store multiple gigabytes (GB) of data, up to 16 GB or more per chip ROM • Allows you to write data only once and after the data has been written, you can read it an unlimited number of times • A ROM chip is used primarily in the start up process of a computer • A ROM chip typically stores only several megabytes (MB) of data, up to 4 MB or more per chip
  9. 9. Differences RAM ROM Stands For  Random Access Memory  Read-only memory Use  RAM allows the computer to read data quickly to run applications. It allows reading and writing  ROM stores the program required to initially boot the computer. It only allows reading. Volatility  RAM is volatile i.e. its contents are lost when the device is powered off.  It is non-volatile i.e. its contents are retained even when the device is powered off Types  The two main types of RAM are static RAM and dynamic RAM.  The types of ROM include PROM, EPROM and EEPROM
  10. 10. References • • • • • •