Tuesday, 2 August 2016

Computer Memory Concepts

Dear Readers, Today in the series of providing free study notes for bank exams we are here with chapter ' Computer Memory Concepts'. In this chapter you learn complete fundamental knowledge about memory in computer system Study notes on computer for bank exams. Please note that in the IBPS exam much more MCQs were asked from basic computer concepts. So you prepare well and read these notes in your preparation.

Must Read our Previous Version : Computer Memory notes with Important Questions and Answers

About Computer Memory:

Memory is one of the most important components of a computer system as it stores data and instructions. Every memory chip contains thousands of memory locations. In the computer, the data is stored in the form of bits and bytes. A bit is the smallest storage unit of memory. A nibble is a collection of 4 bits. Eight bits combined together to form a single byte, which in turn represents a single character. Finally we can say that Computer memory is the storage space in computer where data is to be processed and instructions required for processing are stored.


Types of Computer Memory

Memory is major part of computers that categories into several types. The computer memories can be divided into following categories:
[I] Primary Memory
[II] Secondary memory
[III] Cache Memory 

I - Primary Memory

Primary memory or main memory is a Metal Oxide Semiconductor (MOS) memory used for storing program and data during the execution of the program. It is directly accessible to CPU.

Information stored in RAM can be accessed in any order, and may be erased or written over. Information stored in ROM may also be random-access, in that it may be accessed in any order, but the information recorded on ROM is usually permanent and cannot be erased or written over. 


The memory unit is divided into :
(1) Random Access Memory (RAM)
(2) Read Only Memory (ROM) 

Types of ROM is : 

(A) PROM - Programmable Read Only Memory
(B) EPROM - Erasable Programmable Read Only Memory




II- Secondary Memory/ Non-Volatile Memory

The Secondary memory unit is divided into :
(1) Magnetic Tape
(2) Magnetic Disk
(3) Optical Disk

Types of Optical Disk

(A) Compact Disk/ Read Only Memory (CD-ROM
(B) Write Once, Read Many (WORM)
(C) Erasable Optical Disk


III- Cache Memory

Cache memory, also called Central Processing Unit (CPU) memory, is random access memory (RAM) that a computer microprocessor can access more easily and quickly than it can access regular RAM. This memory is typically integrated directly with the CPU chip or placed on a separate chip that has a separate bus interconnect with the CPU.


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