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This article is to share with you about what rom refers to in computers. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Rom refers to "read-only memory", which can only read out the information that cannot be written; once the information is written, it is fixed, even if the power is cut off, the information will not be lost, so it is also called fixed memory. Ram refers to "random access memory", which can both store and read information from a specified unit, but the stored information will be lost when the power is off.

Rom read-only memory

Read-only memory (Read-Only Memory,ROM) operates in a non-destructive readout mode and can only read out information that cannot be written. Once the information is written, it is fixed, and even if the power is cut off, the information will not be lost, so it is also called fixed memory. The data stored in ROM is usually written before loading into the whole machine, and can only be read out during the working process of the whole machine, unlike random access memory (RAM), which can quickly and easily rewrite the storage content. The data stored in ROM is stable, and the data stored after power outage will not change, and the structure is simple and easy to use, so it is often used to store a variety of fixed programs and data.

The characteristic of read-only memory is that it can only read but not write information. It usually solidifies a basic input / output system called BIOS (basic input / output system) in the ROM of the computer motherboard. Its main function is to complete the power-on self-test of the system, the initialization of each functional module in the system, the basic input / output driver of the system and the boot operating system.

Ram random access memory

Random access memory (Random Access Memory, abbreviation: RAM) is an internal memory that exchanges data directly with CPU. It can be read and written at any time (except when refreshed), is fast, and is usually used as a temporary data storage medium for the operating system or other running programs. RAM can write (store) or read (read) information from any specified address at any time while working.

RAM is used in computers and digital systems to temporarily store programs, data, and intermediate results.

Because ROM has the characteristic of not losing information after power off, it can be used in BIOS chip for computer startup. EPROM, EEPROM and Flash ROM (NOR Flash and NAND Flash) have the same performance as ROM, but can be rewritten. Generally, reading is faster than writing, and writing requires a higher voltage than reading. (reading 5V and writing 12V) but Flash can read and write at the same voltage with large capacity and low cost, such as U disk MP3 is widely used. In computer systems, RAM is generally used as memory, and ROM is generally used as firmware to store some hardware drivers.

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