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

What are primary keys and foreign keys, What are primary keys and foreign k...

What are primary keys and foreign keys? Primary keys are the unique identifiers for every row. They must have unique values and cannot be null. Due to their significance in rel

What is jmx, JMX is native to the Java programming language. As a result, i...

JMX is native to the Java programming language. As a result, it offers natural, efficient, and lightweight management extensions to Java-based functions. It has of a set of specifi

Ethernet 10 base 2 is an example of which topology, Ethernet 10 Base 2 is a...

Ethernet 10 Base 2 is an example of               network topology. (A)  Bus                                           (B)  Ring (C)  Star

What is called when distortion caused on telephone line, Distortion caused ...

Distortion caused on telephone line by an adjacent one is called (A) Cross Fire                      (B) Inductive Disturbance (C)  Cross Talk                     (D) Non

Perfect fundamental logic - artificial intelligence, Perfect fundamental lo...

Perfect fundamental logic - artificial intelligence: However, while it's theoretically  possible to do definite intelligent things (like prove some easy mathematics theorems a

Advantage to depth first search, Advantage to depth first search: It j...

Advantage to depth first search: It just looks like it will be a long period it finds 'DAN' until. This highlights an important drawback for depth first search. It can regular

What is radium utilized for, Q. What is radium utilized for? Answer:- ...

Q. What is radium utilized for? Answer:- Radium was previously used in self-luminous paints for nuclear panels, watches, clocks, aircraft switches and instrument dials. In

Define critical mass and critical volume, Q. Define critical mass and criti...

Q. Define critical mass and critical volume? The minimum size in which at least one neutron is available for further fission reaction. The throng of the fissile material at the

Dynamic memory allocation function, Name the dynamic memory allocation func...

Name the dynamic memory allocation function? Three dynamic memory allocation functions are: a) malloc, b) calloc and c) free.

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