- 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.
- Each location in memory has an address.
- Memory size is measured in kilobytes (KB or K), megabytes (MB), gigabytes (GB), or terabytes (TB).
TYPES OF MEMORY
Volatile
- when the computer's power is turned off,volatile memory loses its contents.
- volatile memory is temporary.
- RAM is the most common type of volatile memory.
Nonvolatile
- nonvolatile memory does not lose its contents when power is removed from the computer.
- nonvolatile memory is permanent.
- examples of nonvolatile memory include ROM.
Volatile memory : RAM
- RAM chips usually reside on a memory module and are inserted into memory slots.
- The amount of RAM necessary in a computer often depends on the types of software you plan to use.
Types of RAM
*DRAM (Dynamic RAM)-chips must be re-energized constantly or they lose their contents.
*SRAM (Static RAM)-chips are faster and more reliable than any variation of DRAM chips. Are much more expensive than DRAM chips.
*MRAM (Magnetoresistive RAM)-a newer type of RAM, called magnetoresistive RAM (MRAM pronounced EM-ram), stores data using magnetic charges instead of electrical charges.
Nonvolatile memory : ROM
- Read-only memory (ROM) refers to memory chipsstoring permanent data and instructions.
- The data on most ROM chips cannot be modified.
Types of ROM
*PROM (Programmable Read-Only Memory)-is a blank ROM chip on which a programmer can write permanently.
*EPROM (Erasable Read-Only Memory)-These chips can be erased and rewritten a number of times.
*EEPROM (Electrically Erasable Programmable Read-Only Memory)-Allows a programmer to erase the microcode with an electric signal.
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