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Legacy joystick/MIDI port
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Figure 226
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S/PDIF
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Figure 227
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S/PDIF connection
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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
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Network
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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
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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
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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
Modem
Figure 230
Typical mouse mini-DIN connection
A modem enables you to connect your PC to a telephone A modem is another easily identifiable device in PCs Most modems have two RJ-11 sockets One connects the modem to the telephone jack on the wall, and the other is for an optional telephone so that you can use the phone line when the modem is not in use (see Figure 232)
Serial Ports
External modems traditionally connected to a male 9-pin or 25-pin D-subminiature port on the system unit called a serial port (Figure 233) Serials ports were the first general-purpose port used on PCs Only in the last few years has the dominance of the far faster and easier-to-use USB finally made serial ports obsolete Even though almost no new systems come with serial ports, you ll still find them occasionally
Figure 231
Trackball
Figure 232
Internal modem
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
Figure 233
Serial port
Printer
For many years, printers only used a special connector called a parallel port Parallel ports use a 25-pin female DB connector that s usually colored fuchsia (see Figure 234) After almost 20 years of domination by parallel ports, almost all printers now come with USB ports Some better models even offer FireWire connections
Joystick
Joysticks (Figure 235) weren t supposed to be used just for games When the folks at IBM added the 15-pin female DB joystick connector to PCs, they envisioned joysticks as hard-working input devices, just as the mouse is today Except in the most rare circumstances, however, the only thing a joystick does today is enable you to turn your PC into a rather expensive game machine! But is there a more gratifying feeling than easing that joystick over, pressing the Fire button, and watching an enemy fighter jet get blasted
Figure 234
Parallel port
2: The Visible PC
Figure 235
Joystick
by a well-placed Sidewinder missile I think not Traditional joystick connectors are colored orange, but most joysticks today connect to USB ports
Plenty More!
Keep in mind that there are lots more devices and connectors out there! These are only the most common and the ones you re most likely to see As we progress through this book, you ll see these less common connectors and where they are used
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