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2.5.3 Memory (RANDOM ACCESS MEMORY (RAM) (RAM also called main memory ,…
2.5.3 Memory
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Computer Memory Basics
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- The computer loads data from read-only memory (ROM) and performs a power-on self-test (POST) to make sure all the major components are functioning properly.
- The computer loads the basic input/output system (BIOS) from ROM.
- The computer loads the operating system (OS) from the hard drive into the system's RAM.
- When you open an application, it is loaded into RAM.
- When you save a file and close the application, the file is written to the specified storage device, and then it and the application are purged from RAM.
- After an application is loaded, any files that are opened for use in that application are loaded into RAM.
READ ONLY MEMORY (ROM)
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Programs in ROM have been pre-recorded. It can only be stored by the manufacturer, once it is done, it cannot be changed.
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Definition
Consists of electronic components that store instructions waiting to be executed by the processor, data needed by those instructions and the results of processing the data (information).
Functions
To store data and instructions waiting to be executed, data needed by those instructions and the results of processing the data (information).