Computer system unit, device and composition
So, what does the computer 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! But what about? Indeed, “the arrow on the monitor does not move” means that the computer is not working! 🙂 But you and I will be interested in exactly that “iron box that stands under the table”, and the name is its system unit! 🙂
Note: the system unit, as a rule, is called a computer already assembled and ready for operation, and the case is just an iron box into which its various components can be installed.
For greater clarity (to consider all the components of the computer separately), you can read the article on assembling a computer with your own hands.
Let’s do it this way: since in the photo that I showed you above, it’s not convenient to show the various components of a personal computer (they are partially covered by various fans and cooling systems), I will show all of its main “stuffing” using the example of the photo below, but I’m going to mean something like this system unit! Have you agreed? 🙂
1. – Power supply
2. – Central processor
3. – External video card (its connector is PCI, AGP, PCI-Express)
4. – RAM
5. – Optical DVD drive
6. – Three Inch Floppy Drive (FDD 3.5)
7. – Hard disk (Winchester)
8. – Motherboard (purple)
Let’s just say what is good about this “implied” computer case? He is big! Yes, someone will say that this is more likely a drawback, but the replacement of components is very comfortable (it is clearly seen where and where you connect and you don’t bother about neighboring protruding parts) A lot of space inside also contributes to a more free circulation of air flows inside the case and this is also a plus , since microcircuits are better cooled. Vibration in such a case is also minimal. Well, he just looks beautiful and stylish! 🙂
The larger black connector on the power supply is for supplying voltage (220 V). Under it is a button to completely de-energize the system unit. Two round holes (PS / 2 connectors), purple – under the keyboard, green – mouse. Below is a rectangular red connector. This is an obsolete connector (LPT port), now it is rarely used, and before it was actively used to connect printers. Next to it is blue – the output of the integrated video card. Under it there are four identical rectangular outputs – 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 integrated network card under the RJ-45 connector (for connecting a network cable and organizing a computer network). Below are the outputs of the integrated sound card (red for connecting a microphone, green for headphones or speakers, blue (line input) 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 are a kind of basic set (without it, you won’t be able to work with a computer). On the other hand, this set can be expanded due to additional devices and chipsets: increasing the number of hard drives (hard drives), the ability to use two video cards simultaneously, installing various additional PCI controllers, etc.