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THE SYSTEM

UNIT

Competencies

Details about memory

Memory Classification Bases Cache Memory Virtual Memory

Memory Classification Bases

Reading/ Writing Capability

Read Only Memory Read/ Write Memory

Data Access Mechanism

Sequential Access Memory Random Access Memory

… Memory Classification Bases

Volatility of Data

No Data Loss without Electricity (Non-volatileMemory) Data loses without electricity (Volatile Memory) Data can be changed and be permanently saved oncechanged (CMOS Memory)

Speed of Access

Cache Memory (Very high accessing speed)

RAM

Random Access Memory

Primary Memory of a computer Data and Program needs to be loaded forprocessing Any memory location can be accessedrandomly Volatile storage Uses Cache support for increased efficiency Flash RAM – Non-volatile/ portable

ROM

Read-only memory Firmware Cannot be changed by the user Start-up instructions, keyboardcontrol capabilities

….The Memory (More Concepts)

Virtual Memory

A technique used to make huge programs run on smallmemory size computers A huge program is divided into many portions Each portion could be adjusted inside the RAM Program is then run by loading only the needed portionfrom hard disk Operating System (OS-win98) is the one who is takingcare of this transparently. Effect: The program runs slowly

… The Memory (More Concepts)