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This article mainly introduces how the information in rom is written, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let's take a look at it.

The information in ROM is generally written by the computer manufacturer and processed on a weekly basis, and the user cannot modify it. ROM works in a non-destructive readout mode and can only read 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.

The contents of the ROM read-only memory (Read-Only Memory,ROM) are written by the manufacturer in a special way, or can only be written by a special writer. When the computer is powered off, the information in the ROM is not lost.

ROM works 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.

There are many types of ROM, and each type of read-only memory has its own characteristics and scope of application. According to its manufacturing process and function, ROM can be divided into five types: mask programmed read-only memory MROM (Mask-programmedROM), programmable read-only memory PROM (Programmable ROM), erasable programmable read-only memory EPROM (Erasable Programmable ROM), electrically erasable programmable read-only memory EEPROM (Elecrically Erasable Programmable ROM) and fast erasable read-write memory (Flash Memory).

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