Chap8

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Unformatted text preview: ion All-in-One Exam Guide 296 Figure 8-8 PCI expansion 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 transfers. 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 33-MHz speed Self-configuring TIP There was a 64-bit version of the original PCI standard, but it was quite rare. 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.

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