Read Only Memory  What is it and what types are there? ▷ 2020

Read-only memory, commonly called ROM, is very important to all of our teams, because very important software and data can be stored in it. Depending on the use that is given, we can find several types of this memory, which are differentiated by the benefits and characteristics of each one.

The word ROM it’s something we’ve heard for a long time and we will continue to listen for a long time to come, because the more time passes, the better uses are given to this important technology.

In this post we will show you what is a ROM and for what do you use it, and so you can understand this concept quite clearly. The content is broken down into different sections, each with a fairly understandable explanation about ROM.

What is a ROM memory and what is it used for in computing?


The word ROM comes from the acronym Read Only Memory, meaning read-only memory. This is a type of storage that is mostly used in computers and other electronic devices, characterized by only accepting reading and never writing. In other words, we can always see and even copy information, but never modify or intervene in it.

As we have already mentioned, only reading can be accepted, because this memory is sequentially accessed, and its presence is independent of that of a power source. The information that ROMs contain is inserted at its start or manufacture, and are basic, operational and primary objective.

One of the characteristics of this memory is that it is much slower than its counterpart, known for RAM, from the acronym Random Access Memory, which means Random Access Memory, and its function is to dump the information in the ROM so that it can be executed with greater speed. From ROM there are different versions, known as EPROM and Flash EEPROM, which can be programmed and reprogrammed many times. But since their process is also rare and somewhat slow, they are called the same way.

How does a read-only memory work and why can’t data be stored in it?

ROM is characterized by being a chip containing a list of commands and instructions, which dictate functions and execute tasks. Although it already sounds like repeated music, it is necessary that you know its basic concept, and that is that these can be read and interpreted but never modified. This concept includes its different versions such as PROM, EEPROM and EPROM.

ROMs contain a row of rows and columns almost equal to RAM, but with a totally different interaction mode. Because RAM is mostly used for transistors, allowing one capacitor to pass through each intersection. On the other hand the ROM connects lines when it is equal to 1. To work properly you don’t need to have perfect programming, which is another of its characteristics.

When there is something wrong or we need to update the information, we should discard them and look for a new one. Your original template mostly requires a lot of work, because it can generate different problems and must be neutralized or eliminated, but already finished with this the benefits of use they are quite big.

Itself, the ROMs they are quite reliable and they can contain all the necessary programming to control our devices in question, and they are useful almost everywhere, from a simple smart toy, even an electronic device.

What are the types of ROM memory that exist?

types of rom

As we have already mentioned above there are different types or versions of ROMs, and such have some other characteristics that make it different, as well as we show you below:

  • ROM: This is the basic ROM, fulfilling the same functions that we mentioned in the previous section, and it is the initial of all, because it is where the others start.
  • PROM: It comes from the acronym Programmable Read-Only Memory, whose translation is Programmable Read Only Memory. It is a digital memory, whose programming can only be done once, because each unit is dependent on a fuse that burns when doing it.
  • EPROM: This is memory that can erase information through exposure to ultraviolet light or high voltage levels. For this reason it lives up to its name, which comes from the acronym Erasable Programmable Read-Only Memory, i.e. Erasable and programmable read-only memory.
  • EEPROM: This memory can be reprogrammed in the circuit itself, allowing access to the information bits individually. The name EEPROM comes from the acronym Electrically Erasable Programmable Read-Only Memory, whose translation is Erasable and Electrically Programmable Read Only Memory.

What are the main uses of a read-only memory?

ROMs have different uses, and they are all very important for the proper functioning of our computers. So that you understand a little its uses and importance in each case, We invite you to read below:

For data

As we well know, since ROMs do not allow us to write or modify content that is already written, they are often used to store basic data that does not need to be modified by anything. As an example of this we can find query tables, mathematical or logical operators, or any other highly import information at a technical level.

For Software

Previously, in approximately the 1980s, PCs came with a single, pre-installed operating system, which could not be modified. This was thanks to the ROM, so that it could be avoided that the information contained could be altered by failures, errors or misuse of the equipment.

Today it is also used for much the same function, since computers now install software with basic functions, or, as it is often called, mother software on ROMs. Example of this is BIOS, SETUP and POST.

If you have any questions, leave them in the comments, we will answer you as soon as possible, and it will also be of great help to more members of the community. Thank you! 😉

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