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Personal Computing Demystified
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the rear of the PC (see Figures 1-2 and 1-4) With the exception of an occasional built-in sound card (as is the case in Figure 1-4), motherboards provide a similar mix of onboard ports The other ports are on expansion cards and are accessible from the back side of the PC (see Figure 1-5) Some PCs have USB ports on the front or side of the system unit Each port provides a direct connection to the system bus and, ultimately, RAM and the processor
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Figure 1-4
Ports built into the motherboard
The USB Port
The most popular standard for connecting peripheral (I/O) devices to a PC is the USB (Universal Serial Bus) port A modern PC will have from four to eight USB ports (see Figures 1-4 and 1-5) If that s not enough, you can expand that number with a USB hub, a device that connects to a USB port and offers three to five additional USB ports And if that s not enough (and it probably will be), hubs can be connected in a tree to provide up to 127 USB ports in all for each USB port If you need more, you are spending way too much money on I/O devices All new PCs and I/O devices support USB 20, a standard that permits data transfer at 480 Mbps (megabits per second) USB 20 is 40 times faster than the original USB standard and is 4000 times faster than the serial port, which is now an antique
CHAPTER 1 Processing Information: Inside the PC
Video card: DVI port, S-video out, and VGA port Ethernet network interface card: Ethernet port Sound card: audio out/in, digital out
FireWire/1394 port on sound card
SCSI card: SCSI port
USB ports (4)
Figure 1-5
Ports on expansion cards
To put 480 Mbps in perspective, 50 copies of this book can be electronically transferred each second via a USB 20 port USB 20 devices are compatible with regular USB ports, but, remember, if you plug a USB 20 device into a regular USB port, the data transfer rate is that of the slower port An incredibly helpful feature of USB is that it lets you hot plug I/O devices That means devices can be connected to or removed from the USB port while the PC is running Gamers love this feature because they can switch controllers so easily Another helpful feature of USB is that it can provide power to USB devices with relatively low power requirements, such as force-feedback game controllers those that vibrate
FireWire or 1394 Port
FireWire or 1394 (the IEEE standard number) is an interface standard that offers 400 Mbps speed, which is comparable to USB 20 (see Figure 1-5) The new FireWire standard, FireWire 800 or 1394b, transfers data at 800 Mbps USB is more popular for use with I/O devices, but FireWire is more popular for use with audio/video (A/V) appliances, such as digital video cameras If you purchase a digicam and you want to do video editing, you may need a FireWire connector to pass video between your camera and your PC Like USB devices, FireWire devices can be hot plugged and I/O devices can be daisy-chained to a single FireWire port It s unlikely that you ll link more than one, though Most modern PCs come with FireWire support, but I would recommend that you check anyway
Personal Computing Demystified
The Keyboard and Mouse Ports
The keyboard and mouse have their own special ports, a 6-pin connector called a PS/ 2 port (refer to Figure 1-4) Modern mice and keyboards, like other I/O devices, are outfitted with USB connectors, making the PS/2 port obsolete However, if you run out of USB ports, you can use an inexpensive PS2-to-USB adapter to connect your mouse and/or keyboard via the PS/2 ports
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