Features of read-only memory, Computer Engineering

Assignment Help:

Q. Features of read-only memory?

ROMs are memories on which it's not possible to write data when they are on-line to computer. They can only be read. This is reason why it is known as read-only memory (ROM). Because ROM chips are non-volatile, data stored inside a ROM aren't lost when power supply is switched off unlike case of a volatile RAM chip. ROMs are also called as permanent stores.

ROMs can be used for storing system programs, micro-programs and subroutines. ROMs are non-volatile in nature and require not be loaded in a secondary storage device. ROMs are fabricated in large numbers in a manner where there is no room for even a single error. However this is an inflexible process and needs mass production. So a new kind of ROM known as PROM was designed that is also non-volatile and can be written only once and therefore name Programmable ROM (PROM). Supplier or customer can perform writing process in PROM electrically. Special equipment is required to perform this writing operation. Thus PROMs are more flexible and convenient than ROMs.

ROMs / PROMs can be written just once but in both cases whatever is written once can't be changed. However what about a case where you read mostly but write just very few times? This led to concepts of read mostly memories and the best illustration of these are EPROMs (Erasable PROMs) and EEPROMs (Electrically Erasable PROMs).


Related Discussions:- Features of read-only memory

Define event marketing, Define Event Marketing. Web-based email marketi...

Define Event Marketing. Web-based email marketing enables the user to promote event through targeted email messages. Other applications help to make own event website (on cloud

Objectives-interconnection network, Objectives After examining this uni...

Objectives After examining this unit, learner's will be able to understand discuss the importance and needs of interconnection network; explain the part of interconn

What is dispatch unit, What is dispatch unit? A separate unit which we ...

What is dispatch unit? A separate unit which we call the dispatch unit fetch instructions from the front of the queue and sends them to the execution unit. The dispatch unit al

How does applet update its window when information changs, How does the App...

How does the Applet update its window when information changes? Whenever an applet requires to update the information displayed in its window, this simply calls repaint ( ) way

The voltage of telephone given by telephone companies, Telephone companies ...

Telephone companies normally provide a voltage of to power telephones? Telephone companies usually give a voltage of to power telephones -48 volts DC.

Define memory allocation functions, The various memory allocation functions...

The various memory allocation functions are described below: (i) malloc( ) : It is a memory allocation function that assigns requested size of bytes and returns a pointer to t

Explain the term - strong typing and weak typing, Explain the term - Strong...

Explain the term - Strong Typing and  Weak Typing Strong Typing : When any operation upon an object can be checked during compile time, when type is confirmed forcefully.

What are the central interfaces of the r/3 system, What are the central int...

What are the central interfaces of the R/3 system? There are three central interfaces:- Presentation Interface. Database Interface. Operating system Interface.

What are the three basic types of web documents, What are the three basic t...

What are the three basic types of web documents? There are three fundamental types of web documents: Static, Dynamic and Active. STATIC A static web document resides i

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