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

Describe the protocol used by the mmu, Question 1: a) A distinction is...

Question 1: a) A distinction is often made between computer architecture and computer organisation. Describe, using examples, the meaning of computer architecture. b) Name

Multiple Statement Groups as Suites, Sets of individual statements making u...

Sets of individual statements making up a single code block are known as suites in Python. Composite or complex statements for example if, def while and class are those which neces

Coal Computer organization and assembly language, Code for Program to find ...

Code for Program to find the second highest number from a given array in Assembly Language by using NASM

Development of personnel computer operating system, Development of Personne...

Development of Personnel Computer Operating System: The next important breakthrough in computer use occurred in 1982, with the introduction of the IBM personal computer. The I

Simple Algorithm, How to make an assignment entitled "Decision Making: Fore...

How to make an assignment entitled "Decision Making: Forecasting" and I am required to make a pseudocode and flowchart based on the task.

Explain what is rmi, QUESTION (a) Explain what is RMI? (b) Draw a di...

QUESTION (a) Explain what is RMI? (b) Draw a diagram showing the different parts of the Java RMI architecture. (c) What is the function of the RMI security manager and RM

Data buses, Data buses: The availability of reliable digital semi-condu...

Data buses: The availability of reliable digital semi-conductor technology has enabled the inter-communication task between different equipment to be significantly improved. P

Outdoor patient department features - receptionist module, Outdoor Patient...

Outdoor Patient Department (OPD) Features The following modules can be developed for various areas and workers. A receptionist Module Receptionist updates all bas

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