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

Kirchoff''s voltage law , Kirc hoff's Voltage Law   The sum ...

Kirc hoff's Voltage Law   The sum of all the voltage drops around a closed circuit loop will add to zero  V1+(-V2)+(-V3)+(-V4)= 0

Information technology or information system, Information Technology or Inf...

Information Technology or Information System Before going further we need to clarify what we mean by the term information system. It is easy to confuse terminology as many tex

What is meant by common control, What is meant by common control? In se...

What is meant by common control? In several switching systems, the control subsystem may be an integral part of the switching network itself. This system is termed as direct co

Operations of the web, Operations of the Web mainly depend on hypertext as ...

Operations of the Web mainly depend on hypertext as its means of interacting with users. But what is hypertext? Hypertext as such is the same as regular text that is it can be read

Is the process before and after the swap are the same, Is the Process befor...

Is the Process before and after the swap are the same? Give reason. Process before swapping is residing in the primary memory in its original form. The regions (text, data and

Explain main requirements satisfy by page replacement policy, List out the ...

List out the main requirements between page replacement policies which should be satisfied by a page replacement policy? The major requirements that should be satisfied

Determine the firewall in intranet technology, Determine the firewall in In...

Determine the firewall in Intranet technology Firewall remains the basic foundation of Internet and Intranet security, for many users getting into the corporate Intranet would

Atom-collider, Many physicists believe that the universe is governed by a s...

Many physicists believe that the universe is governed by a single system. A system which is capable of describing the behaviour of the very large (stars and planets) and the very s

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