RAM and ROM are both different types of memories used in any computer to make it fast and to enable it to access information stored in the computer. Every computer comes with a certain amount of physical memory which is actually chips that hold data.
This memory is referred to as Random Access Memory or RAM. RAM is a part of hardware that stores operating system’s application programs and currently running processes that can be accessed randomly, i.e. in any order that the user desires.
Data in RAM stays for only as long as the computer is running, and gets deleted as soon as computer is switched off. RAM usually comes in the form of microchips of different sizes such as 256MB, 512MB, 1GB, 2GB etc. Computers are so designed that this RAM can be increased up to a certain capacity.
ROM, on the other hand refers to Read Only Memory. Every computer comes fitted with this memory that holds instructions for starting up the computer.
This is a memory that has data written permanently on it and is not reusable. However, there are certain kinds of read only memory that can be rewritten but they are called Erasable Programmable Read Only Memory, or EPROM. These are generally in the form of CD-ROM or Floppy Disk that can load the OS to the RAM.
Similarities between RAM and ROM end up with both being types of memories. There are glaring differences between the RAM and the ROM.
Types of RAM
A buyer should learn about the different types of RAM before attempting to buy RAM modules. Different types of RAM have different capabilities. It is important that a user knows which RAM suits his or her purposes. Some of the various types of RAM available on the market include SRAM and DRAM, each of which has a number of subtypes.
SRAM , or static random access memory, has multiple transistors, usually between four and six. This kind of memory chip is usually used as cache. It does not have a transistor in each cell. Although SRAM is the faster option, it also tends to be more expensive than DRAM.
DRAM , or dynamic random access memory, has memory cells with a capacitor and paired transistor. This kind of memory requires constant refreshing. A buyer can also choose from a number of different subtypes of DRAM, including EDO DRAM and SDRAM.
ROM is the standard for this type of memory. Because of the way ROM is designed, it is essential that the chip needs to be programmed perfectly with the correct data in order for it to work accurately. These kinds of chips cannot be rewritten or reprogrammed. Thus, if it is incorrect or the data needs to be updated in some way, there is no way to salvage the chip. Once they are completed, however, ROM chips tend to be very inexpensive.
PROM , or programmable read only memory, is more fragile than ROM, and it can only be programmed once. Because of this limitation, PROM tends to be inexpensive.
EPROM , or erasable programmable read only memory, tries to do away with the problem of PROMs only being able to be used a single time. This type of memory can be rewritten many times. In order to be erased, however, the user has to use a special tool for the task.
EEPROM , or electrically erasable programmable read only memory, is another step up from EPROM because EEPROM chips do away with some of the drawbacks. For example, EEPROM chips do not need to be removed to be rewritten. Additionally, a portion of the chip can be changed without erasing the entire chip. Furthermore, it does not require special equipment to rewrite the chip.
Flash memory is another type of ROM that is actually a type of EEPROM chip that attempts to further improve on the technology. Flash memory tends to be faster than normal EEPROM chips because it tends to write data in chunks instead of one byte at a time .
Those who are new to electronics may be unsure of the difference between RAM and ROM, which are different types of memory found in computers and some other electronic devices. Computers need both types of memory, as they perform different functions in the computer.
ROM is used for storing permanent information and running the operating system of a computer. RAM, on the other hand, is used for temporary information that disappears when the computer is turned off.
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