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A monitor connects to the video connector on the system unit You ll usually see one of two types of video connectors: the older 15-pin female DB Video Electronics Standards Association (VESA) connector or the unique digital video interface (DVI) connector VESA connectors are colored blue, whereas DVI connectors are white Many video cards have both types of connectors (Figure 224), or two VESA or two DVI connectors Video cards with two connectors support two monitors, a very cool thing to do!
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Figure 223
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Figure 224
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Video card with (from left to right) S-Video, DVI, and VESA ports
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2: The Visible PC
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Figure 225
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Occasionally you ll run into a video card with a mini-DIN connector, such as the S-Video connector you can see at the left in Figure 224 These mini-DIN connectors support all sorts of interesting video jobs, such as connecting to output to a television or input from a video camera The newest video connector is called High-Definition Multimedia Interface (HDMI) , shown in Figure 225 HDMI is still very new to the video scene, but brings a number of enhancements, such as the ability to carry both video and sound on the same cable Primarily designed for home theater, you ll see video cards with HDMI connectors growing more common over the next few years
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Sound
The sound device on your card performs two functions First, it takes digital information and turns it into sound, outputting the sound through speakers Second, it takes sound that is input through a microphone and turns it into digital data To play and record sounds, your sound device needs to connect to at least a set of speakers and a microphone All PCs have at least two miniature audio jacks: one for a microphone and another for stereo speakers Better cards provide extra miniature audio jacks for surround sound A few sound cards provide a female 15-pin DB port that enables you to attach an electronic musical instrument interface or add a joystick to your PC (see Figure 226) Adding more and more audio jacks to sound cards made the back of a typical sound card a busy place In an effort to consolidate all of the different sound signals, the industry invented the Sony/Philips Digital Interface Format (S/PDIF) connection (Figure 227) One S/PDIF connection replaces all of the mini-audio connections, assuming your surround speaker system also comes with an S/PDIF connection
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Figure 226
Mike Meyers A+ Guide to Managing and Troubleshooting PCs
S/PDIF
Figure 227
S/PDIF connection
The color scheme for sound connections is complex, but for now remember one color green That s the one you need to connect a standard pair of stereo speakers
Network
Networks are groups of connected PCs that share information The PCs most commonly connect via some type of cabling that usually looks like an extra-thick phone cable A modern PC uses an RJ-45 connection to connect to the network Figure 228 shows a typical RJ-45 network connector Network connectors do not have a standard color
Modern PCs have built-in network connections, but this is a fairly recent development For many years, network devices only came on an expansion card, called a network interface card (NIC) The term is so common that even built-in network connections which most certainly are not cards are still called NICs
Mouse
Most folks are pretty comfortable with the function of a mouse (Figure 229) it enables you to select graphical items on a graphical screen A PC mouse has at least two buttons (as opposed to the famous one-button mouse that
Figure 228
Typical network connection
Figure 229
Mouse
2: The Visible PC
came with Apple Macintosh computers until recently), while a better mouse provides a scroll wheel and extra buttons A mouse uses either a USB port or a dedicated, light-green mini-DIN connector (see Figure 230) A variation of the mouse is a trackball (Figure 231) A trackball does the same job as a mouse, but instead of being pushed around like a mouse, the trackball stays in one place as you roll a ball with your fingers or thumb
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