               README.TXT - Documentation Supplement
                 December 31, 1993 - Release 1.00

                      Hercules Graphite(tm) 
                Windows NT Display Driver Diskette                            
 
 
 Contents:

    IMPORTANT: Before You Begin

    Hercules Graphite Display Driver Installation


  IMPORTANT: Before You Begin
  ---------------------------

  Display configurations for Windows NT are selected 
  from within Windows NT's graphical user interface (GUI).

  IMPORTANT PRELIMINARY INFORMATION:
  To avoid damage to your monitor and possible re-installation
  of Windows NT, you must select only the Hercules Graphite
  display configuration(s) that your monitor can support. The 
  documentation that accompanies your monitor will include 
  technical specifications listing the monitor's maximum 
  horizontal scan frequency (e.g. 31.5kHz, 35.5kHz...64kHz, 
  etc.). You should locate this information before making a 
  selection. 

  If you were to select a Graphite display configuration that 
  your monitor could not support (i.e. high resolution mode, 
  high screen refresh rate, etc.) the following scenarios could 
  occur:

  1.  You could run the risk of damaging the hardware
      components in your monitor.

  2.  Because your monitor was not able to sync properly,
      you might be unable to view Windows NT. In the worst 
      case, correcting this condition could require a re-
      installation of Windows NT. However, if you have a DOS 
      partition (i.e. dual-boot setup), you could restore 
      Windows NT to a VGA display configuration. In order to be
      able to restore Windows NT to a working configuration in
      case of error: (a) make sure that Windows NT is currently 
      installed and operating with a VGA display driver, and 
      (b) copy the contents of Windows NT's 
      \WINNT\SYSTEM32\CONFIG subdirectory into a backup 
      directory in your DOS partition. If you were ever to 
      select a Hercules Graphite display configuration that your 
      monitor did not support, you could simply copy Windows NT's 
      configuration files from the backup directory contained 
      in the DOS partition back into Windows NT's 
      \WINNT\SYSTEM32\CONFIG subdirectory to restore Windows NT 
      to a VGA display configuration.

  Step 5 contained in the next section titled "Hercules 
  Graphite Display Driver Installation" provides
  information about the minimum horizontal scan rate 
  frequency required to operate each Hercules Graphite
  display configuration. PLEASE READ CAREFULLY BEFORE
  MAKING A SELECTION!
  

  
  Hercules Graphite Display Driver Installation
  ---------------------------------------------
 
  These instructions assume that Windows NT is currently
  installed and operating with a VGA display driver. If this
  is not the case, install Windows NT's VGA display driver
  before proceeding with these instructions.

  1.  Launch Windows NT and locate the "Main" program group. 
      Double-click on the "Windows NT Setup" program item icon.

  2.  When the "Windows NT Setup" dialog box appears, choose
      "Options" from the pulldown menu and select the "Change
      System Settings" option.

  3.  Open the "Display" section and choose to scroll down and
      click on the "Other (Requires a disk from a hardware
      manufacturer)" entry. Click on "Close." 

  4.  You will be prompted to insert the disk provided by the 
      hardware manufacturer. Place the Hercules Graphite
      Windows NT Display Driver Diskette in a floppy drive
      and specify that floppy drive for Setup. Click on "OK."

  5.  You will be presented with a list of Hercules Graphite 
      display configurations. Each display configuration 
      selection will list the graphics processor (AGX),
      resolution, color pixel depth and screen refresh rate
      (in Hz). To avoid damage to your monitor, select only 
      a display configuration (refresh rate) that your monitor 
      can support. The documentation that accompanies your 
      monitor will include technical specifications listing the 
      monitor's maximum horizontal scan frequency (e.g. 31.5kHz, 
      35.5kHz...64kHz, etc.). You should be certain of this
      aspect of your monitor's operation before making a 
      selection.

      Once you have determined your monitor's horizontal scan
      frequency, consult the following table to select your
      display configuration for your 1MB VRAM or 2MB VRAM
      Hercules Graphite model:

      =======================================================
            1MB GRAPHITE MODELS DISPLAY CONFIGURATIONS       
              (Models HG210, HG310, HG510 and HG610)
      ------------------------------------------------------- 

          Display Configuration      Minimum Horizontal Scan
               Selection               Frequency Required
          ---------------------      -----------------------
      AGX 640x480, 256 colors, 60Hz         31.5kHz
      AGX 640x480, 256 colors, 70Hz          38kHz
      AGX 640x480, 256 colors, 90Hz          48kHz
      AGX 800x600, 256 colors, 56Hz         35.5kHz
      AGX 800x600, 256 colors, 60Hz          38kHz
      AGX 800x600, 256 colors, 70Hz          48kHz
      AGX 800x600, 256 colors, 90Hz         61.5kHz
      AGX 1024x768, 256 colors, 60Hz         48kHz
      AGX 1024x768, 256 colors, 70Hz         58kHz
      AGX 1024x768, 256 colors, 90iHz       35.5kHz


      =======================================================
             2MB GRAPHITE MODELS DISPLAY CONFIGURATIONS
                     (Models HG420 and HG720)
      ------------------------------------------------------- 

          Display Configuration      Minimum Horizontal Scan 
               Selection               Frequency Required
          ---------------------      -----------------------
      AGX 640x480, 256 colors, 60Hz         31.5kHz
      AGX 640x480, 256 colors, 70Hz          38kHz
      AGX 640x480, 256 colors, 90Hz          48kHz
      AGX 640x480, 65536 colors, 60Hz       31.5kHz
      AGX 640x480, 65536 colors, 70Hz        38kHz
      AGX 640x480, 65536 colors, 90Hz        48kHz
      AGX 640x480, TRUE COLOR, 60Hz         31.5kHz
      AGX 800x600, 256 colors, 56Hz         35.5kHz
      AGX 800x600, 256 colors, 60Hz          38kHz
      AGX 800x600, 256 colors, 70Hz          48kHz
      AGX 800x600, 256 colors, 90Hz         61.5kHz
      AGX 800x600, 65536 colors, 60Hz        38kHz
      AGX 800x600, 65536 colors, 70Hz        45kHz
      AGX 1024x768, 256 colors, 60Hz         48kHz
      AGX 1024x768, 256 colors, 70Hz         58kHz
      AGX 1024x768, 256 colors, 90iHz       35.5kHz
      AGX 1024x768, 65536 colors, 60Hz       48kHz
      AGX 1280x1024, 256 colors, 60Hz        64kHz
      AGX 1280x1024, 256 colors, 90iHz       48kHz

      Move the cursor bar to the display configuration that you 
      wish to install and click on "OK."

  6.  Click on "Close" to close the "Change System Settings" 
      dialog box. When the "Windows NT Setup" dialog box 
      re-appears, double-click on the close box in the upper 
      left hand corner of the dialog box to close it. The "Setup 
      Message" dialog box will appear with the message "The 
      changes you have made will not take effect until the 
      computer is restarted." Click on "OK."  
  
  7.  Press CTRL-ALT-DEL to bring up the "Windows NT Security"
      dialog box and click on "Shutdown..."

  8.  When the "Shutdown Computer" dialog box appears, check
      the box that reads "Restart when shutdown is complete"
      and then click on "OK" to restart Windows NT with your
      selected Windows NT display configuration.
 

  ** End of File **
