The history of memory modules and today s mainstream memory modules

The difference between the 1st generation and the 2nd generation is that the socket is different, hehe, the simplest answer.

Features of memory:

The data written to RAM (i.e., read-write memory, i.e., memory modules) will disappear completely after the power is off, and the earliest program data that the CPU reads and executes when the computer is turned on comes from ROM (read-only memory). Memory is the basic component of computers (including microcontrollers), and memory has been available since the day computers were available. External memory belongs to computer peripherals, and hard disk is the external memory developed after the stage of tape and floppy disk.

What memory does:

Memory is an indispensable component of a computer (PC, MCU). Unlike dispensable external memory, memory is a component that reads and writes on a bus; Memory is more than just a data warehouse. In addition to a small number of indispensable programs in the operating system to reside in memory, the programs we usually use, such as Windows, Linux and other system software, including typing software, game software, etc., although a large amount of data including programs are placed on external memory devices such as tapes, disks, optical discs, mobile disks, etc., but any data in external memory can only be really used when transferred into memory.

Any input (from external memory, keyboard, mouse, microphone, scanner, etc.) and any output (display, printing, audio, writing to external memory, etc.) on a computer can only be made through memory.

The role and classification of memory.

Memory is the main component in a computer, and it is relative to external memory. The programs we usually use, such as windows98 system, typing software, game software, etc., are generally installed on external memory such as hard disks, but only this can not use its functions, they must be transferred to the memory to run, in order to really use its functions, we usually enter a piece of text, or play a game, in fact, are carried out in memory. Usually we store a large amount of data to be stored permanently in external memory, and put some temporary or small amounts of data and programs in memory.

Memory is divided into DRAM and ROM, the former is also called dynamic random access memory, one of its main features is that data will be lost after power failure, we usually refer to this kind of memory; The latter is also called read-only memory, we usually start the BIOS program stored in the ROM on the motherboard, and then it calls the windows98 or windows95 system in the hard disk, one of the main features of the ROM is that the data will not be lost after power failure. Resources.