Memory access, Basic Computer Science

Assignment Help:

Memory access:

The use of semi-conductor memory elements (bistables) has been made possible by the use of large scale integrated circuits (LSI) which provide reliability, ease of application and good storage capacity per unit volume.  A disadvantage of such memories is that a power supply is needed to hold the information stored.  Batteries may be provided to prevent loss of memory in case of power failure.  This is not necessary for memories made up of ferrite cores. 

Typically, 15 elements are needed for one word, therefore for a 2,000 word RAM we would need 30,000 elements arranged in a three dimensional matrix.  Figure 12 shows a 9-word store, each word consisting of 3-bits. 

80_memory access.png

Computer Memory

If one wishes to read the word at address W5, the memory address register sends, by way of the X and Y drive and decode circuits, a 1-bit along wires X2 and Y2.  The contents of W5 are then read sequentially from least significant bit to most significant bit by the sense wire, which is connected to each of the 27 elements. 

As part of a general-purpose computer ROMs may be used to store information which is unchanged over most, if not all, of the operational life of the equipment.  If all the hardware of a computer is wired in using ROMs then we no longer have a general-purpose computer and hence have lost the inherent flexibility.  However, saving in circuitry results, and some degree of flexibility can be regained by having interchangeable ROMs mounted on printed circuit boards (PCB) which can be removed from and fitted to the computer. 


Related Discussions:- Memory access

The microprocessor, THE MICROPROCESSOR The three fundamental units, whi...

THE MICROPROCESSOR The three fundamental units, which comprise a CPU, have now been discussed in general terms.  So too has a microprocessor, because a microprocessor can be de

Algorithm, solve three given number in ascending order through algorithm

solve three given number in ascending order through algorithm

Data transmission, Data transmission: Most digital communication data i...

Data transmission: Most digital communication data is transmitted in a serial form, that is, only one bit at a time. Transmission of data in serial form means each bit is tran

Power point microsoft, what are slides how do you put slides on powerpoint

what are slides how do you put slides on powerpoint

Unix Shell, Write a shell script, change-lines, which will substitute a str...

Write a shell script, change-lines, which will substitute a string for a replacement string for each occurance of the string in files specified. The original file will be saved,

Which port does FTP uses, Why is it called out of band protocol? A1) FTP us...

Why is it called out of band protocol? A1) FTP uses port 20 and port 21; port 20 is used for data connection, whereas port 21 is used for control connection. FTP is known as out-of

Project, Identify three factors to consider in determining the competitive ...

Identify three factors to consider in determining the competitive value of information technology. Justify the selected factors. Of the factors selected, determine if each fact

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd