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

Information systems development methodologies, Task 1:   Methodologies a...

Task 1:   Methodologies are 'regarded as a recommended series of steps and procedures to be followed in the course of developing an information system' and were introduced to im

Illustrate design of combinational circuits, The digital circuits that we u...

The digital circuits that we use now-a-days are constructed with NOR or NAND gates in place of AND-OR-NOT gates. NOR & NAND gates are known as Universal Gates as we can realize any

Explain documentation libraries, The documentation rules are almost exactly...

The documentation rules are almost exactly the similar as for Scripts "Documenting scripts". Although from a technical point of view it is feasible to place measures in libraries i

What do you mean by lock synchronization, Q. What do you mean by Lock Synch...

Q. What do you mean by Lock Synchronization? Lock Synchronization: In this method contents of an atom are updated by requester process and sole access is granted before atomic

Computer graphics, what do you mean by inter leasing.how it is display the ...

what do you mean by inter leasing.how it is display the frame having 525 scan lines

What are the main features of uml, What are the main features of UML ...

What are the main features of UML Defined system structure for the object modelling Support for all different model organization Strong modelling for behaviour an

Write the game using writing functions, The year is 2199. For many generati...

The year is 2199. For many generations, the robotic Cyleth have faithfully served humanity. However, under the direction of the computerized superintelligence Skyweb, they have tur

Operating-systems/Linux, sir, please give me an source code program for Hie...

sir, please give me an source code program for Hierarchial-Directory-system using any Unix/Linux

Determine the values of the output of the logic gates, Write the values of ...

Write the values of the C output for the following gates: For a(n) ________ gate, the output is zero if any of the inputs are equal to  one. For a(n) ________ gate ,the

Linux, Explain about unix file system architecture

Explain about unix file system architecture

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