Computer system unit, device and composition
So, what does the computer's system unit consist of? An important clarification here is that under the word "computer" different people can mean, oddly enough, different things: a monitor, a printer, a computer case , even ... a computer mouse! And how? After all, "the arrow on the monitor does not move" means - the computer does not work! :) Us with you will be interested in the "iron box that stands under the table", and the name of its system unit! :)
Note: the system unit is usually referred to as an already assembled and ready-to-use computer, and the case is just an iron box into which various components can be installed.
For more visibility (to view all the components of the computer separately), you can see the article on assembling the computer with your own hands.
Let's do this as follows: since in the photo that I showed you above, it is not convenient to show various personal computer components (they are partially covered by various fans and cooling systems), then I will show all its main "stuffing" in the example of the photo below, but I will mean something like this system unit! Have agreed? :)
1. - Power supply
2. - The central processor
4. - RAM
5. - Optical DVD drive
6. - Three-inch floppy disk drive (FDD 3.5)
8. - Motherboard (purple)
Let's just say how good is this "implied" computer case? He is big! Yes, someone will say that this is rather a disadvantage, but the replacement of the components is very comfortable (you can clearly see what and where you switch and do not scratch on the neighboring protruding parts) A lot of space inside also contributes to a more free circulation of air flows inside the hull and this is also a plus , since the chips are better cooled. Vibration in this case is also minimal. Well, he just looks beautiful and stylish! :)
The larger black connector on the power supply is for the voltage supply (220 V). Below it is a button for completely de-energizing the system unit. Two round holes (PS / 2 connectors), purple - under the keyboard, green - a mouse. Below is a rectangular connector of red color. This is an out-of-date connector (LPT port), now it is rarely used, and was previously used to connect printers. Near it blue - the output of the built-in video card . There are four identical rectangular outputs underneath - these are USB connectors (for flash drives, mice, scanners, printers and other devices with a USB interface).
To the right of them is the connector of the built-in network card for the connector "RJ-45" (for connecting the network cable and organizing the computer network). Below are the outputs of the integrated sound card (red for connecting a microphone, green for headphones or speakers, blue (line-in) for connecting devices using amplifiers). As you can see, below (perpendicular to the motherboard) is another video card (external), with its own set of connectors.
The above components of the system unit - it's a kind of basic set (without it you can not work with the computer). On the other hand, this set can be expanded with additional devices and chipsets: an increase in the number of hard disks (hard disks), the possibility of using two video cards simultaneously, the installation of various additional PCI controllers, etc.