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Unformatted text preview: otherboard speed and 32-bit-wide data bus found in 386 and 486 systems.
They also wanted a bus that was self-configuring, freeing techs from the drudgery of
manual configuration. Finally, they had to make the new bus backward compatible,
so end users wouldn’t have to throw out their oftentimes substantial investment in ISA
expansion cards. False Starts
In the late 1980s, several new expansion buses designed to address these shortcomings appeared on the market. Three in particular—IBM’s Micro Channel Architecture
(MCA), the open standard Extended ISA (EISA), and the Video Electronics Standards
Association’s VESA Local Bus (VL-Bus)—all had a few years of modest popularity from
the late 1980s to the mid 1990s. Although all of these alternative buses worked well,
they also had shortcomings that made them less than optimal replacements for ISA:
IBM charged a heavy licensing fee for MCA, EISA was expensive to make, and VL-Bus
only worked in tandem with the ISA bus. By 1993, the PC world was eager for a big
name to come forward with a fast, wide, easy-to-configure, and cheap new expansion
bus. Intel saw the need and stepped up to the plate with the now famous PCI bus. PCI
Intel introduced the peripheral component interconnect (PCI) bus architecture (Figure 8-8)
in the early 1990s, and the PC expansion bus was never again the same. Intel made
many smart moves with PCI, not the least of which was releasing PCI to the public domain to make PCI very attractive to manufacturers. PCI provided a wider, faster, more
flexible alternative than any previous expansion bus. The exceptional technology of the
new bus, combined with the lack of a price tag, made manufacturers quickly drop ISA
and the other alternatives and adopt PCI.
PCI really shook up the PC world with its capabilities. The original PCI bus was 32 bits
wide and ran at 33 MHz, which was superb, but these features were expected and not
earth-shattering. The coolness of PCI came from its capability to coexist with other ch08.indd 295 12/14/09 2:49:19 PM All-In-One / CompTIA Network+ All-in-One Exam Guide / Meyers & Jernigan / 170133-8 / Chapter 8 CompTIA A+Certificat...
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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