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Unformatted text preview: ion All-in-One Exam Guide 296 Figure 8-8
bus slots expansion buses. When PCI first came out, you could buy a motherboard with both
PCI and ISA slots. This was important because users could keep their old ISA cards and
slowly migrate to PCI. Equally impressive was that PCI devices were (and still are) selfconfiguring, a feature that led to the industry standard that became known as plug and
play. Finally, PCI had a powerful burst-mode feature that enabled very efficient data
NOTE Before PCI, it was rare to see more than one type of expansion slot
on a motherboard. Today this is not only common—it’s expected! PCI Bus 32 bits wide
Self-configuring TIP There was a 64-bit version of the original PCI standard, but it was
The original PCI expansion bus has soldiered on in PCs for over ten years. Recently,
more advanced forms have begun to appear. Although these new PCI expansion buses
are faster than the original PCI, they’re only improvements to PCI, not entirely new expansion buses. The original PCI might be fading away, but PCI in its many new forms
is still “King of the Motherboard.” ch08.indd 296 12/14/09 2:49:20 PM All-In-One / CompTIA Network+ All-in-One Exam Guide / Meyers & Jernigan / 170133-8 / Chapter 8
All-In-One Chapter 8: Expansion Bus 297 AGP
One of the big reasons for ISA’s demise was video cards. When video started going
graphical with the introduction of Windows, ISA buses were too slow and graphics
looked terrible. PCI certainly improved graphics when it came out, but Intel was thinking ahead. Shortly after Intel invented PCI, they presented a specialized, video-only version of PCI called the accelerated graphics port (AGP). An AGP slot is a PCI slot, but one
with a direct connection to the Northbridge. AGP slots are only for video cards—don’t
try to snap a sound card or modem into one. You’ll learn much more about this fascinating technology in Chapter 19, “Video.” Figure 8-9 shows a typical A...
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This note was uploaded on 04/27/2010 for the course COMPTIA 1201 taught by Professor N/a during the Spring '10 term at Galveston College.
- Spring '10