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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board
      9  XI  Expansion Buses

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Extended ISA (EISA)
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Peripheral Component Interconnect (PCI)
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VESA Local Bus (VLB)

As it was revealed in Chapter 0000, makers of video cards did not want to be making cards for ISA, EISA and MCA.

What formed were the Video Electronics Standards Association (VESA), and the VESA Local Bus (VLB). The VLB expansion bus was backwards compatible at the ISA business end. The extra socket was located at the other end of the card.

Figure 27: VLB cards featured a standard ISA connector as seen on the right, with a new high-density connector on the left.

 


VLB Hell

About the same time VLB was becoming popular, the price point for computer components was dropping rapidly, in part to inexpensive ‘off shore’ manufacturing. One outcome was very inexpensive cases, which were not shaped with great precision.

After working on a system using VLB, (and successfully testing) then installing a screw to retain the card, a poorly bent case would slightly ‘pull up’ the card from the high density VLB connection, disabling the video! This can be the cause of endless frustration until the cause is found. The solution is to remove everything from the case and bend the metal chassis until it is truly square.



Previous Topic/Section
Extended ISA (EISA)
Previous Page
Pages in Current Topic/Section
1
Next Page
Peripheral Component Interconnect (PCI)
Next Topic/Section

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