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

C programming program, I wrote a program that adds up 5x5 matrices by colum...

I wrote a program that adds up 5x5 matrices by column and row. Now i have to use pointers to rewrite the same code how would do that

Describe the binary search algorithm, QUESTION 1 Describe the binary se...

QUESTION 1 Describe the binary search algorithm using an example of your own. QUESTION 2 (a) By showing all your workings, give a big-O estimate for f(x) = (x + 1)lo

What are the features of microprocessor ?, Previously two sections the fund...

Previously two sections the fundamentals of the workings and architecture of the central processing unit has been explained. There has been a common look at easy processor architec

Components of a computer, COMPONENTS OF A COMPUTER: We use a computing...

COMPONENTS OF A COMPUTER: We use a computing system basically to feed in some data that is processed by the computer and some information is generated as a result.. For this w

Generations of computers, Ask question #Minimum assignment on generations o...

Ask question #Minimum assignment on generations of computers 100 words accepted#

Management information system, suggest 5 ways by which new products and ser...

suggest 5 ways by which new products and services can be developed using management information system

Cisc, two characteristics og CISC architecture?

two characteristics og CISC architecture?

Static ram, STATIC RAM: Flip-Flops are the basic memory cells in a stat...

STATIC RAM: Flip-Flops are the basic memory cells in a static RAM. Each flip-flop is based on either two bipolar transistors or two Metal Oxide Semiconductors Field-Effect Tra

statistics, write a 2 page essay operational gaming and monte carlo simula...

write a 2 page essay operational gaming and monte carlo simulation

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