the brand trademark of desktop computer is on the front of the chassis, and the trademark positions of different brands and models are different. You should be able to find it by looking at the chassis panel. There will also be a parameter sign on the back of the brand machine, and everything has a brand trademark. If not, it should be an assembly machine.

data extension: the mainframe refers to the main body part of the computer except the input and output devices. It is also a control Mainframe for placing the motherboard and other main components. It usually includes CPU, memory, motherboard, hard disk, CD-ROM drive, power supply, chassis, cooling system and other input/output controllers and interfaces.

In network technology, it refers to the terminal equipment that sends and receives information.