What are the characteristics of rom memory

The characteristic of ROM memory is that it can only read data from the memory, but cannot write information into it. The data will still exist after the computer is powered off. ROM read-only memory can only read information but cannot write information. Usually a basic input/output system is solidified in the ROM of the computer motherboard, called BIOS (Basic Input Output System); its main function is to complete the automatic power-on of the system. Inspection, initialization of each functional module in the system, basic input/output driver of the system and booting the operating system.

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

Memory is an important component of the computer, also known as internal memory and main memory. It is used to temporarily store operation data in the CPU, as well as data exchanged with external memories such as hard disks. It is the bridge between external memory and the CPU. All programs in the computer run in the memory. The performance of the memory affects the overall performance of the computer. As long as the computer starts running, the operating system will transfer the data that needs to be calculated from the memory to the CPU for calculation. When the calculation is completed, the CPU will transmit the results.

Memory is mainly divided into RAM (random access memory), ROM (read-only memory) and Cache (cache).

ROM (Read Only Memory):

ROM read-only memory works in a non-destructive readout mode and can only Reading 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 stored 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.

Features: Can only read data from the memory, but cannot write information into it. The data will still exist after the computer is powered off.

Read-only memory can only read information but cannot write information. Usually, a basic input/output system is solidified in the ROM of the computer motherboard, 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.

Extended knowledge:

RAM (Random Access Memory):

Random Memory, commonly known as memory, the computer memory we often refer to as 8g refers to this (not entirely correct). RAM requires constant power supply at all times, otherwise data will be lost. It is made of semiconductor materials and is the working place of the computer.

Features:

• You can read data from the memory and write information to the memory

• For storage The commands, programs and data required to run the program

• Information is naturally lost when the computer is powered off.

Cache (cache memory)

Cache is between the CPU and RAM. It is a memory that reads and writes faster than RAM. . When the CPU writes or reads data to RAM, it will be stored in the Cache simultaneously. When the CPU needs the data again, the CPU will read the data from the Cache instead of accessing the slower memory. If the required data is in the Cache No, the CPU will read the data in the Cache again.

The difference between RAM and ROM

Generally speaking, it is difficult to understand the relationship between RAM and ROM and the usual running memory and hard disk capacity. In fact, from the general The meaning is the same, but there are some differences from the perspective of computers and mobile phones:

It is generally easier to understand from the perspective of computers. RAM is what we usually call running memory. It is indeed available at any time. Readable and writable. Because the data processed by the CPU is mediated by running memory. Information is not saved after a power outage. So for ROM, is it the hard disk? Doesn’t it mean that ROM can only be read? The hard drive can be modified. Indeed, it must be made clear that RAM and ROM are both memories, and the hard disk is external memory, so ROM is not equal to the hard disk. The ROM in the computer is mainly used to store some system information or start the BIOS program. These are very important. They can only be read and generally cannot be modified. They will not disappear even if the power is turned off.

Compared with RAM and ROM, the biggest difference between the two is that the data stored in RAM will disappear automatically after the power is turned off, while ROM will not disappear automatically and can be saved for a long time without power.

In a mobile phone, RAM is the same running memory as a computer; and ROM is connected to the hard disk. Part of the ROM in the mobile phone is used to store system information and some installation software, and the rest is large. Part of the capacity is used as a hard disk, which can be read and written.

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