Hard Drive

 

Hard drive is installed inside the computer and is fixed. They are faster and safer to read floppy drives whose storage capacities range from 20 Mbytes to 2 Gigabytes. The fastest go below 15 milliseconds to access the information. At present, avoid buying discs with capacities of less than 120 Mb in a short time will not serve to almost nothing.

Currently there are higher-capacity hard drives ranging from 10.15 to 40 or 60 Gb

Prices for hard drives range from $ 78 dlls disk 10GB to $ 132 dlls disk 40 Gb

 

CD-ROM or Compact Disc

 

They are more expensive and more as the minimum is 500 MB and can be stored in the future around some Terabytes. It is recommended to purchase equipment that contains this device, thanks to large amounts of information so varied that they can support this type of storage and begin to build large information base on a single disc: Encyclopedias, courses, tours , newspapers and magazines in the future before us.

 

Power

 

As much as all of the microprocessor circuit devices that are feeding on very small amounts of a source of energy needed to provide support and regulate the amount needed. Since any variation in voltage may be enough to burn off those circuits.

 

Devices for growth:

 

The doors are ready to receive the connection of any device or card that expand the capabilities of a computer work, and are the most important point to make sure to have made a good investment. These are expansion slots and ports. Ports are connection points that come with the computer and which allow rapid installation of the devices more common, as are the keyboard, printer, monitor, etc..

 

Information input device

 

These are those that allow the microprocessor to obtain information and instructions to follow in time. Thanks to them, we can communicate with the computer. Among the most common are:

 

The keyboard

Through which we can give you specific instructions to the microprocessor via a written language. This is very similar to the keyboard of a typewriter but with more keys. Mainly characterized by the keys SHIFT, ALT and CTL to allow you to enter virtually any information within programs or documents.

Mouse

This device can simulate the small signal designs and locations as if it were done with the index finger, thanks to programs that benefit on the screen with an arrow when sliding the device on a flat surface moves the arrow in the direction that takes place on the screen. Once identified, objects and even allows you to choose and change take place.

Optical or E-scanners crawlers

They are virtually small copiers, through which light beams scan an image point by point and transferred to computer memory as a file, the type of information that can trace its kind are given, including any that track color .

The quality of these is represented by the maximum resolution that can track an image, there are from 300 dpi to 2400, although at the time of purchase must be taken into account by one of the highest quality output from your printer and amount of available space on your hard drive as well as the size of the RAM in your machine because of a mismatch may never use your crawl beyond the capabilities of your computer.

One of the most outstanding features of crawlers images are programs that allow the intelligent character recognition to make the image of the crawled documents in free text that can be modified once it even letter by letter.

Scanner manual: It seems that the mouse moves over a smooth surface will turn your image file is very slow and requires great precision to avoid errors in the picture.

Scanner bed: These are basically small copiers that like them, traced in his document screen. Very fast, accurate and increasingly inexpensive.

Stylus or screen barcode spreading, well known to us in large supermarkets, which interpret coded information through a system of bars.

Microphones audio card

Already started to see around our computer systems based on speech recognition that can make a computer using a card installed specifically to convert your voice into bits and vice versa, and thus begin to see voice-controlled devices, as we answer some by phone when we call a bank to ask for our balance.

Information output devices

Are those that allow us to obtain the information processed by the computer, and among the most common are:

The monitor

This is merely a device called the CTR (cathode ray tube) in which data can be displayed in text format and processed by computer graphics. The standard video of modern computers is based on the VGA, which gives the user the ability to represent not only the screen images of better quality but also can be seen in normal quality authentic photographs, such capacity is not had none of the systems prior to this video.

When choosing a computer is very important for us to know its quality, brand and individual security, as if this device is just that: it can pollute more, lower quality tire and deteriorate over our eyes, a lot of energy is heated more than the entire team, and so on.

To make matters worse were it not for the quality you need is not going to serve at the time of use programs that generate detailed images represent realistic or accurate. This should take into account especially those that require computer equipment to provide Graphic Design, Architecture, Video Editing, printing, etc..

The ability to generate quality images of a monitor is called the resolution and determines the number of dots or "pixels" that contains the screen. Thus a monitor of 640x480 (standard VGA) will be lower quality with many colors and realistic images of a 1024x768 commonly called SuperVGA. Also there are intermediate points of 800x600.

In addition a normal VGA monitor system can image up to 256 different shades in a better exchange can handle up to 16 million tones in color, here lies the reason for its resolution and speed.

Both the image quality, accuracy and speed are supported by the video card, which takes the information from main memory, stored in the memory itself and ordered him to monitor the order and arrangement of the information point by point. All this means that if you change your monitor type and you must also change the type of video card.

What is a printer?

These act as typewriters, ie empty the information contained in the main memory on paper. And fall into three main types:

Dot matrix printers

They are the fastest and sold, good to work with common office supplies, although the noises are more economical and cheaper to print on the market.

And are called so because its printing system is based on the same typewriter, or a roll, plain paper, an inked ribbon, but instead of a wedge with the font is replaced here by a head needle, which come out in vertical sequence twinge of points to form the letter.

They do this line by line by letter word by line. As you can observe at any time, do it so fast you barely see how to be drawing the line that points away from typical office computer noise.

The measure of speed and quality is the number of characters printed per second, the median price and speed of sound is 260 and 350 CPS. These characteristics make the needle printers most useful and economical in the daily work of an office or business.

Inkjet printers

They work much like the dot-matrix, only instead of needles are tiny micro tubes tens of times thinner than a human hair shed where small jets or droplets of ink from touching the paper and form a dispersed image Text very good quality, although they are cheap are usually slower than the needle, but has the great advantage of managing high quality, even of the most popular colors are mostly in professional, school and home.

For a reasonable price you can find printers such as color can be a very good percentage of fidelity to a real picture 720x720 DPI (dots per inch).

Currently there are printers for printing color photographs as it is:

Which can achieve an average price of 300 dollars

Similarly, it is currently available printers are very good quality and a lower price such as:

Which can be achieved by an average price of 100 dollars.

Laser Printers

Here the system is totally different from the others and is somewhat similar to a traditional copier, or paper with a magnetic powder-fine ink which, when melted with a laser beam creates an unparalleled quality paper that comes to reaching the 600 DPI.

While still falling rapidly in price, are more expensive per print, but the only ones with quality printing, is a tool for printing, photo editing or graphic design business. The speed of these as the inkjet is measured in sheets per minute.

Printers like this currently cost about 400 dollars.

But now you can get a color laser printer as follows:

Printers like this one are on the market cost about 2000 dollars.

The Plotters

Large printers are based on color pen nibs that allow architects and engineers to turn a plane or trace lines in the memory of your computer on a real high level, ready for shipment, saving them using sophisticated tools to the design of hand levels as necessary for reproduction.

These are those through which we can both access and enter information or instructions to the microprocessor. Among the most common:

Drives read / write Diskettes

These specialize in reading the information stored on floppy disks, and write the data in these data to be stored. According to its density will be writing the kind of disk can read or write. The most commonly used at present are the 5 ¼ "and 3 ½". We now have other units such as the Zip Drive and Disk Drive Mini

Iterative Monitors

There are special displays that present information as it does any monitor can also enter information pointing our finger on it, though more expensive than the simple act of buying a mouse, are very useful in open areas where you need speed and stamina in the use device, as is the fact of making reservations at airports.

Device-Modem Fax Modem

When we talk on the phone sending cable signals to reach the similar device becomes voice again, though the computers are machines that generate these signals or waves, on the contrary a computer all the time this internally generated interruptions 1'sy 0'so form of bits is also called digital frequency.

The modem is a device that once connected to a computer by hand modulates a binary signal in waves or analog signals enabling them to take advantage of the existing telephone infrastructure in our world to send in the same way voice, data, images and a instead of the other side DEModulator converting those signals back into bits to be played on the computer interpreted the information received from across the world.

This capability coupled with the new computers come with a card combined with a fax modem, which they call fax-modem which means that besides being able to connect to any computer in sync with us anywhere in the world, we can also connect with other people companies or institutions that do not even have a computer if the conventional fax that it is imperative for any business. If one looks carefully one will find that this conventional fax device is 3 appliances in one, that is:

You have to crawl to photocopy the document to be sent. It is a modem; it modulates and demodulates return to receive the image traced. It's empty printer paper because the information received.

There are many brands of modems, but now is the fastest modem 56k V90, and now the company's Internet service provider Prodigy Internet, has 128k modem that lets you make and receive calls even if These surfing the Internet. There are also other modems which provide Internet service like broadband cable modems which allow you to be connected to the Internet without a phone line, plus the Internet or cable is 10 times faster try the modem dialing or phone line.