Greetings. :)
   
   This archive contains a screenmode hack that I have been using over the
 past several months to make my life easier when using AGA in VGA-compatible
 modes only. Note that this hack may not work under v3.1 OS, but I know for
 sure it works under v3.0 OS.
 
 Installation:
---------------

  This hack replaces the following files:

 (In Devs:Monitors)  

    Multiscan.info
    DBLPAL.info
    DBLNTSC.info
    
 (In both ENV:Sys and ENVARC:Sys)
    
    overscan.prefs
    
  Before you overwrite your original files, you should back them up under
 a different name (like overscan.prefs.orig, as an example).
  
  Installation is easy, by using the CLI copy command.
  
    (files to copy to Devs:Monitors)
    
      Multiscan.info, DBLNTSC.info, DBLPAL.info
    
    (files to copy to ENVARC:Sys)
    
      overscan.prefs
      
    (files to copy to c:)
    
      BootControl
      ScreenAdjust
      
    (files to copy anywhere you like)
    
      BootControl.doc
      
    BootControl is a file that allows you to install DBLNTSC as the default.
  monitor. I did not write it, but I use it as a standard part of my system
  boot-up. You can use it to get a 31kHz screen when you boot with "no
  startup-sequence". Unfortunately the position of the screen is not correct
  for 31kHz modes, but you can use the script/batch file "ScreenAdjust" to
  have Intuition activate the screenmode hack for you even without the 
  Workbench being loaded. Just click cancel when Intuition requests that
  you close all open windows. :)  Strange, but it works.        
  
    If you wish to use the BootControl program, you should insert the 
  following line at the very beginning of your startup-sequence:
  
  assign T: ram:
  BootControl MODE=VGA INSTALL BOOT GFX=BEST LOADVGA PATCHALERT QUIET READICON >NIL:
  wait 1
  
    BootControl will require one quick re-boot to install itself. The "wait 1"
  statement is there to make sure nothing tries to write to the hard drive
  when it does, because that would temporarily invalidate your hard drive.
  
 Once installation is complete:
--------------------------------

   Now you need to reboot your computer. BootControl will install DBLNTSC
 as the default.monitor (if you are using it). For a 704x500 Workbench that
 doesn't flicker, run the Screenmode prefs and give it a size of 704x500!
 Now you will have the Workbench running at 704x500 in an eye-friendly
 refresh rate of 31.5kHz/60Hz.
 
 Problems:
-----------

   This hack reveals a limitation of the AGA chipset's hardware sprite
 system. In the Multiscan and DBLPAL modes, the mouse sprite becomes invisible
 at the far right edge of the screen. Now you know why the standard Multiscan
 monitor driver limited the size of the display to 656 pixels across.
 
   I personally don't at all mind the trade-off. I simply use the right border
 as an area the put the mouse cursor when I'm typing something. The solution
 to this problem would be to use a software rendered mouse sprite rather than
 using the sprite hardware, but as of yet, no one has written an OS patch
 which does this.
 
 
       Terry Miller 2
  Atlantis Software Development
      bitbrker@ionet.net