Memory, Basic Computer Science

Memory

The memory unit is used for the storage of binary coded information. Information consists of instructions and data where:

• Instructions are the coded pieces of information that direct the activities of the CPU.

• Data is the information that is processed by the CPU.

The memory hardware contains a large number of cells or locations. Each location may store a single binary digit or a group of binary digits. The cells are grouped so that a complete binary word is always accessed. Word length varies typically from 4-bits up to 64-bits depending upon machine size. Each location in the memory is identified by a unique address, which then allows access to the word. Consequently, to obtain information from the memory, the correct address must be placed onto the address bus.

There are fundamentally two types of memory - primary memory and secondary memory. Primary memory is essential; no computer can operate without this. Secondary memory is necessary to supplement, or back, the primary memory on large computing systems; hence, it is often called backing memory.

There are two types of semi-conductor primary memory: ROM (Read Only Memory) and RAM (Random Access memory). Both types employ solid state circuitry, and are packaged in IC form.

Figure shows how these primary memories are connected to a simple computer bus. 

323_memory.png

ROM and RAM Connection to Buses

Posted Date: 9/13/2012 6:55:39 AM | Location : United States







Related Discussions:- Memory, Assignment Help, Ask Question on Memory, Get Answer, Expert's Help, Memory Discussions

Write discussion on Memory
Your posts are moderated
Related Questions
Question 1 What is role playing game? Explain the special design issues for sports games Question 2 What do you mean by collusion? Explain its types Question 3 Wri

Question 1 Briefly explain the classification of the computers Question 2 What is arithmetic logic unit? How it is helpful in CPU? Question 3 How do you install a

Question (a) Describe the following built-in functions and illustrate each using simple examples. Specify every possible parameters where required Replace() StrComp()


Define Levels of Abstraction in a DBMS, explain briefly, Conceptual Schema, Physical Schema, External Schema

create a flowchart showing average score for the 3 quizzes assume that there are 3 sections each having 5 students the only valid number to be entered is 1-100 for the quizzes shou

main task of sofware developper

Electronic mail is another PC to PC and PC to mainframe data exchange. If you subscribe to an electronic mail service, it will enable your PC to gain access to a 'mailbox' on a ma

what is cai

Question 1 What is the difference between Variable Bit Rate and Constant Bit Rate? Question 2 Write a note on: Normalization, Reverberation, Noise Reduction, Filters, and