Like this CertiGuide? Get it in PDF format!
Click Here!

Custom Search







Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 9: Graphic Cards
      9  Card Components, Modes and Architecture

Previous Topic/Section
Upgrading, Troubleshooting, and Common Problems
Previous Page
Pages in Current Topic/Section
1
Next Page
Chapter 10: The Small Computer System Interface, SCSI
Next Topic/Section

Explanation of Common Video BIOS Settings

Here are some of the more common BIOS settings related to video and how they are used:

  • Video Bios Shadow: Video BIOS shadowing copies the VESA Bios from the video card's ROM (slow, REFERENCE ROM) to RAM, where access is much faster. This results in a performance increase, as the BIOS is in constant use.

  • Assign IRQ to VGA: As the setting description implies, this assigns an IRQ to the VGA interrupt. This should always be enabled to allow operating systems to interact with the card.

  • VGA Palette Snoop: This enables a device to watch the VGA palette to see if it changes. This was most commonly used with old ISA video cards that provided TV tuner capabilities. For modern PCI and AGP cards, this should be disabled.

  • AGP Aperture: This defines how much system RAM the AGP bus has access to. An ideal size is between 1/3 to ½ system RAM - graphics cards with more onboard RAM can use a smaller value here

  • AGP Turbo: This is a fancy name for "Write Allocation Mode”. Very few machines can actually operate correctly with this enabled, so as a rule it should be disabled.

  • VGA Boot From: As the description implies, this controls where the VGA BIOS is sourced. Normally the options are AGP or PCI, and should be set to the location of the graphics card.

Previous Topic/Section
Upgrading, Troubleshooting, and Common Problems
Previous Page
Pages in Current Topic/Section
1
Next Page
Chapter 10: The Small Computer System Interface, SCSI
Next Topic/Section

If you find CertiGuide.com useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider buying an inexpensive PDF equivalent of the CertiGuide to A+ (A+ 4 Real) from StudyExam4Less.com. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

CertiGuide to A+ (A+ 4 Real) (http://www.CertiGuide.com/apfr/) on CertiGuide.com
Version 1.0 - Version Date: March 29, 2005

Adapted with permission from a work created by Tcat Houser et al.
CertiGuide.com Version Copyright 2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.