Computer System ( Memory).......:)

Memory
•Memory 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), orterabytes(TB).

Type of memory

• volatile
• non volatile

 Volatile memory
•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
Discovering

Nonvolatile memory

•Nonvolatile memory does not lose its contents when power is removed from the computer.
•Nonvolatile memory is permanent.
•Examples of nonvolatile memory include ROM.

Differences between volatile and non-volatile

volatile (ROM)

• Loses its contents when power is turned off
• (store data for temporary time only)
• Can be read from and written to by the processor and other devices.
  Hold data or programs that are currently being used by the processor.
• RAM chip are assembled on a small circuit board called memory module which is plugged onto the memory slots.

non volatile

• Does not lose contents when power is removed (store data permanently).
• Data is prerecorded for read only and cannot be modified or removed.
• Contain a small startup program (BIOS) which is used to boot the computer.
• Exists as a chip on the motherboard.

explanation and example of RAM

•RAM chips usually reside on a memory moduleand are inserted into memory slot
•The amount of RAM necessary in a computer often depends on the types of software you plan to use.

example of RAM

• DRAM(Dynamic RAM )
• SRAM(Static RAM )
• MRAM(Magnetoresistive RAM)

 explanation and example of ROM

•Read-only memory (ROM) refers to memory chips storing permanent data and instructions.
•The data on most ROM chips cannot be modified.

example of ROM

• PROM(Programmable Read-Only Memory)
• EPROM(Erasable Read-Only Memory)
• EEPROM(Electrically Erasable Programmable Read-Only Memory)