What are the characteristics of ROM

The characteristics of ROM are that it can only be read and not written, and information will not be lost after shutdown. ROM is a solid-state semiconductor memory that can only read pre-stored data. It works in a non-destructive reading mode and can only read information but cannot write it. Once the information is written, it is fixed and the information will not be lost even if the power is turned off. lost. Because ROM has the characteristic of not losing information after power is turned off, it can be used as the BIOS chip for computer startup.

The operating environment of this article: Windows 7 system, Dell G3 computer.

Introduction to ROM memory

Read-Only Memory (ROM) is a solid-state semiconductor memory that can only read out previously stored data without damaging it. It works in a read-out mode and can only read information but cannot write information. Once the information is written, it is fixed and will not be lost even if the power is turned off, so it is also called fixed memory.

The data stored in ROM is usually written before being loaded into the whole machine. It can only be read out during the operation of the whole machine. Unlike random access memory, the storage content can be rewritten quickly and conveniently. The data stored in ROM is stable and will not change after a power outage. It has a simple structure and is easy to use, so it is often used to store various fixed programs and data.

Characteristics of ROM memory

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

Scope of use

Because ROM has the characteristic of not losing information after power failure, it can be used as the 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. Writing requires a higher voltage than reading (reading 5V and writing 12V), but Flash can be read at the same voltage. It has large capacity and low cost, and is widely used in MP3 disks such as USB flash drives. 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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