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Method for Enabling Video Monitor Operation at International Standards Organization-Compliant Refresh Rates

IP.com Disclosure Number: IPCOM000116258D
Original Publication Date: 1995-Aug-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Deckys, DJ: AUTHOR [+2]

Abstract

Disclosed is the use of two additional configuration bits in nonvolatile CMOS (Complimentary Metal Oxide Semiconductor) storage, allowing the user to set an ISO (International Standards Organization) compliant refresh rate. This method is useful when a video monitor capable of the higher refresh rates returns an ID (identification) code, such as 8514, not indicating this capability.

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This is the abbreviated version, containing approximately 53% of the total text.

Method for Enabling Video Monitor Operation at International Standards
Organization-Compliant Refresh Rates

      Disclosed is the use of two additional configuration bits in
nonvolatile CMOS (Complimentary Metal Oxide Semiconductor) storage,
allowing the user to set an ISO (International Standards
Organization) compliant refresh rate.  This method is useful when a
video monitor capable of the higher refresh rates returns an ID
(identification) code, such as 8514, not indicating this capability.

      The table indicates the meanings assigned to values of these
configuration bits.  The system Setup program, as part of the Set
Features options, allows the user to set these bits.  When the system
is first powered on, the default setting (00) is stored in CMOS.  The
POST (Power-On Self Test) routine then reads this value and sets the
refresh rate based on the ID code returned from the monitor.  The
user may then configure the system with the system Setup program,
changing the levels of these bits to indicate to POST that the
monitor is either capable of an ISO-compliant 72Hz refresh rate or an
ISO- compliant 75Hz refresh rate, and that the monitor should be
enabled as such.  During the Setup program, the following information
is displayed to the user:
  o  Setup Heading- Monitor refresh rate setting
  o  Setup Choices- Standard (DEFAULT)
     -  72Hz - ISO compliant
     -  75Hz - ISO compliant
  o  Setup Help- Standard - (DEFAULT) Use the monitor ID returned by
     ...