5/19/95
                        =============================
                        | AUTODESK ADI 4.2  Ver2.2B3|
                        =============================

The Aquila driver is a professional quality PADI (Protected mode Autodesk Driver
Interface) combined display and rendering device driver to be used with AutoCAD
Release 11/12, 3D Studio 1.0/2.0, and AutoShade 2.1.

Features
*  Protected mode operation, PADI 4.2 specification
*  32 bit display list for "no regen" operation
*  Display list operation with 16 active viewports, including paperspace
   viewports
*  Birds-Eye and Edge-Pan features for convenient zooms and pans
*  Partial redraws on overlapping viewports
*  Redraw list for maximum redraw speed with Release 11
*  Intelligent clean-up (Erase Buffer ) to eliminate "flashing"
*  Display list memory meter
*  AutoCAD memory usage statistics
*  Paging-Alarm - disables display list usage when paging become excessive
*  Reliable dual screen operation for AutoCAD
*  Variable font support- allows fonts up to 16 by 30 in size
*  User configurable screen colors
*  15 and 16 bit "Band-Free" Rendering support
*  24 and 32 bit Rendering support
*  Text screen emulation window for Release 12


S3 Products Supported:
----------------------

S3 graphics controllers 80x, 805I, 928, 928PCI, Vision864, Vision964, Trio32,
Trio64, Vision866, Vision868, Vision968
Vision866, Vision868 and Vision968 Resolutions and Color Depths Supported


The following display and/or rendering resolutions are supported:
Ŀ
 Rsolution     Colors      Minimum       Display = D        Support      
                         Video Memory    Rendering =R                    
                          (MBytes)                                       
Ĵ
 640 x 480      256           1              D,R                         
Ĵ
 640 x 480      32K           1              R                           
Ĵ
 640 x 480      64K           1              R                           
Ĵ
 640 x 480      16.7M         2              R                           
Ĵ
                                                                         
Ĵ
 800 x 600      256           1              D,R                         
Ĵ
 800 x 600      32K           1              R                           
Ĵ
 800 x 600      64K           1              R                           
Ĵ
 800 x 600      16.7M         2              R                           
Ĵ
                                                                         
Ĵ
 1024 x 768     256           1              D,R                         
Ĵ
 1024 x 768     32K           2              R                           
Ĵ
 1024 x 768     64K           2              R                           
Ĵ
 1024 x 768     16.7M         4              R                           
Ĵ
                                                                         
Ĵ
 1152 x 864     256           2              D,R                         
Ĵ
                                                                         
Ĵ
 1280 x 1024    256           2              D,R                         
Ĵ
 1280 x 1024    32K           4              R                           
Ĵ
 1280 x 1024    64K           4              R                           
Ĵ
 1280 x 1024    16.7M         4              R        Only for Vision968 
Ĵ
                                                                         
Ĵ
 1600 x 1200    256           2              D,R                         
Ĵ
 1600 x 1200    32K           4              R        Only for Vision968 
Ĵ
 1600 x 1200    64K           4              R        Only for Vision968 



Known Limitations:
------------------
1. AutoCAD 11, 12 - With a combination of dual screen mode and shell edit, ACAD
   screen is corrupted. The problem occurs in all resolutions under AutoCAD 11,
   and only 640x480x8 in AutoCAD 12.  Use the command "REINIT S" to correct the
   display (only in ACAD 12).

2. AutoCAD 11, 12 - After using the Birdseye, a non-transparent Aquila command
   may behave as a transparent command in the command stack. Pressing the space
   bar in this condition causes the command prior to the last one to appear.

3. AutoCAD 12 AVE - REPLAY IMAGE to a non-black screen will result in inaccurate
   colors in the replayed image.

4. AutoCAD 12 AVE - When configured for 256 colors and a 256-color drawing is
   saved and reloaded with AVE Preferences/Color Map set to Best Map/Fold, the
   display of drawing colors may appear to be limited to 8 colors.

5. AutoShade 2.1 - Dual monitor configuration is not supported.

6. AutoShade 2.1 - Changing Settings/Background to a non-black background color
   will not display the background color during the first rendering. This occurs
   for any resolution with more than 256-colors.  A second rendering will
   display correctly.

7. AutoCAD 12 AVE - Extra lines or rectangles may be displayed under full screen
   renderings with more than 256 colors.

8. AutoCAD 12 - Modelspace viewport boundary may partially disappear after
   entering AME authorization screen if Flip-screen is disabled.  Workaround:
   Type Redrawall.

9. AutoCAD 12 International - The Aquila font may not work well with all
   international fonts.  Workaround:  Use the default VGA font instead by
   disabling the Aquila font.  Type SET AQUILA_FONT=.

10.AutoCAD 12 AVE - Rendering to a viewport may corrupt the top and rightmost
   edge of the active viewport.



Installation:
-------------
1. Now, the drivers are located in a directory ( e.g. C:\TRIODRV\ADI42 ), after
   the steps of Section " Decompressing Drivers " in Chapter " Software
   Installation " of manual completed.

2. Create a directory on your hard drive for the Aquila files by entering from
   the C:\ prompt

   MD \AQUILA

   Move to that directory by entering

   CD \AQUILA

3. Copy all files from the source sub-directory ( e.g. C:\TRIODRV\ADI42 ) to
   the sub-directory you are currently in.

   COPY C:\TRIODRV\ADI42\*.*


Basic Configuration:
--------------------
1. Add the following 3 lines to your AUTOEXEC.BAT:
   SET DSPADI=C:\AQUILA\RCP_S3.EXP
   SET RCPADI=%DSPADI%
   SET RDPADI=%DSPADI%
   Additional variables will need to be set for AutoCAD Release 12 (see below).

2. Refer to your application's Installation and Performance Guide for
   information about other environment variables, configuring other non-display
   device drivers and system configurations that are necessary to optimize the
   performance of your application.

3. Aquila will detect the Autodesk application that it is being configured for
   and will provide correct display driver defaults for your applications. By
   accepting the default parameters, your driver will be configured correctly.
   This will work with AutoCAD, AutoShade, or 3D Studio.


Font Configuration for AutoCAD and AutoShade:
---------------------------------------------
1. This driver will use the 8-bit international font in the VGA BIOS (8x16) or,
   if present, an Aquila optional font file. The following table contains
   recommended fonts for AutoCAD. Select a filename based on the font size
   recommended for your desired resolution.

   filename   width   height   int'l   comments
   --------   -----   ------   -----   --------------------------------------
   none       8       16       yes     VGA default
   6x9.fnt    6       9        yes     extremely small
   8x16.fnt   8       16       yes     more legible than VGA font
   9x15.fnt   9       15       no      good for x800 modes
   12x20.fnt  12      20       no      good for x1024 modes & small CRTs
   12x24.fnt  12      24       no      good for x1024 or x1280 modes
   15x25.fnt  15      25       no      best for x1280 modes & small CRTs
   16x30.fnt  16      30       no      only useful for x1280 and higher modes

2. The driver searches for the file AQUILA.FNT in the current directory. If not
   found, it searches for the file specified in the DOS environment variable
   AQUILA_FONT. For example,

   SET AQUILA_FONT=C:\AQUILA\9X15.FNT

   If the font file is readable, it will be used; otherwise Aquila will borrow
   font data from the VGA BIOS.

3. Please note that font files can only be used with AutoCAD and AutoShade,
   while 3D Studio will only use the internal 8x16 VGA font. If Aquila font
   files are used with 3D Studio, characters such as arrowheads may look strange
   or different. If you are using AutoCAD and 3DStudio on the same system, you
   may want to disable an active Aquila font before entering 3DStudio by
   entering

        SET AQUILA_FONT=


Logo Configuration for AutoCAD:
-------------------------------
This driver is supplied with an AQUILA.LGO file. This is a duplicate of the
NEWS3I.LGO file provided for AutoCAD 11 and 12 and contains a gray S3 logo that
serves as the default logo for the lower right Status Display area. To install
a special logo, copy the logo file of choice to the AQUILA.LGO file in your
AQUILA directory.


AutoCAD Release 11 Configuration
--------------------------------
1. Set the environment variables as described above under Basic Configuration.

2. Set the font variable as described above under Font Configuration. Rerun your
   batch files if needed to initialize the variables.

3. Start AutoCAD by moving to the \ACAD directory and typing ACAD.

4. If AutoCAD has not yet been configured or your acad.cfg has been deleted,
   skip to 6, below.  Otherwise, select option #5 "Configure AutoCAD".

5. Select option #3 "Configure video display".

6. Select option #1 "ADI P386 v4.0/4.1 display" which will display the Aquila
   configuration menu.

7. Choose 1 to select a display resolution mode. If your system is capable of
   dual monitor operation, you will be asked if you wish to use this option.

Option 1 is the only display driver option that must be set before using AutoCAD
11. For options 2 through 9, you may accept the pre-set defaults by choosing 0
to exit the Aquila configuration menu, or adjust them as follows for a
customized display configuration. Details regarding these custom Aquila display
list options are provided later in this document.

8. Choose 2 to activate the color menu to customize colors used for the AutoCAD
   graphics screen.

9. Choose 3 to disable the Graphics Flip-screen. This feature is available for
   Release 12 only.

10.Choose 4 to disable or adjust the Display List memory management options.

11.Choose 5 to disable or adjust the Erase-buffer size (default is enabled for
   "flash-less" redrawing during editing).

12.Choose 6 to enable or adjust the sensitivity setting for the Page-Alarm
   (default is off).

13.Choose 7 to adjust or enable the Edge-pan option (default is off).

14.Choose 8 to disable or change the size of the Birds-eye (default is 25% of
   the total screen size).

15.Choose 9 to configure the digitizer or mouse button to use for entering
   commands. The default is the transparent Birds-eye command "'AQBIRD", as the
   recommended double-click command. This will allow you to bring up the
   Birds-eye anywhere on the graphics screen while in the middle of an AutoCAD
   command.

16.Exit the Video Display Configuration menu.

17.Configure pointer, printer and plotter as needed.

18.Return to the main AutoCAD menu, saving the configuration results.


AutoCAD Release 12 Configuration
--------------------------------
AutoCAD Release 12 uses a much different method of locating device drivers than
Release 11. Release 12 will search directories for device files, ignoring the
DSPADI= environment variable. If you are installing or configuring Release 12
for the first time, please pay careful attention to the following setup
instructions.

1. Set the environment variable in both the ACADR12.BAT and AUTOEXEC.BAT files
   as follows:
   SET ACADDRV=C:\AQUILA;C:\ACAD\DRV

2. Set the font variable as described above under Font Configuration. Rerun your
   batch files if needed to initialize the environment variables.

3. Start AutoCAD by moving to the \ACAD directory. Enter ACAD if you are
   configuring for the first time or ACAD -R if you are reconfiguring and select
   item #3 to activate the Video Display driver menu.

4. From the available display drivers, select "S3 ADI v4.2 Display and Rendering
   by ATC Graphics".

5. Choose 1 to display the list of available resolutions. Select the AutoCAD S3
   Display resolution mode you want. If your system is capable of dual monitor
   operation, you will next be asked if you wish to use this option.

Option 1 is the only option that must be selected before using AutoCAD 12.
For options 2 through 9, you may accept the pre-set defaults by choosing 0 to
exit the Aquila configuration menu, or adjust them for a customized display
configuration.  Details regarding the special Aquila display list features are
provided later in this document.

6. Choose 2 to start the color menu to customize colors used for the AutoCAD
   graphics screen.

7. Choose 3 to enable or disable the "Flip-screen" feature (default is on for
   Release 12).  Flip-screen is automatically disabled if you selected dual
   monitor operation.

8. Choose 4 to disable or adjust the Display List memory management options.

9. Choose 5 to disable the Erase-buffer size (default is enabled for
   "flash-less" redrawing during editing).

10.Choose 6 to enable or adjust the sensitivity setting for the Page-Alarm
   (default is off).

11.Choose 7 to enable or adjust the Edge-Pan feature. (Default is off.)

12.Choose 8 to disable or change the size of the Birds-Eye (default is 25% of
   the total screen size).

13.Choose 9 to configure the digitizer or mouse button to use for double-click
   entering of your selected command. The default  is the recommended
   transparent Birds-eye command "'AQBIRD", as this will allow you to bring up
   the Birds-eye anywhere on the graphics screen while in the middle of an
   AutoCAD command.


14.Exit the Aquila Display configuration menu and the Video Display
   configuration menu.

15.Configure pointer (mouse or tablet), printer and plotter as needed.

16.Return to the main menu and save the configuration results.


AutoCAD 12 AVE Configuration
----------------------------
The Aquila driver is a combined display and rendering device driver and supports
15, 16, 24 and 32 bit rendering within AutoCAD. AutoCAD's AVE Rendering must be
configured for the Aquila driver.

1. If you are reconfiguring AutoCAD, delete your current AVE.CFG file.

2. Once in AutoCAD, either type RCONFIG at the AutoCAD Command prompt, or select
   from the pulldown menus, RENDER/PREFERENCES/Reconfigure.

3. When you configure the rendering  driver for AutoCAD Render, select option 1,
   AutoCAD's configured P386 ADI combined display/rendering driver. (Do not
   select option 2).

4. Select the S3 Rendering resolution you want from the menu list of available r
   esolutions supported by your system.  Your selection must be compatible with
   any limitations related to your current AutoCAD display configuration.

  *  All resolutions listed will work when rendering to a full-screen with a
     single monitor system.
  *  With a dual-monitor configuration, select rendering to a viewport (because
     currently AutoCAD 12c2 does not return properly from rendering to a
     separate screen).
  *  If your AutoCAD display resolution is set to any 16-color resolution, then
     you must render to the full screen instead of a viewport. Any resolution
     may be selected.
  *  If your AutoCAD display resolution is set to any 256-color resolution and
     you plan to render to a 256-color viewport, select the same resolution for
     your display and renderings. When rendering to a viewport, AutoCAD's
     display driver controls the rendering resolution.
  *  If you select the 32K or 64K color modes, you will be asked if you wish to
     enable "Band-Free" mode, which allows the best color quality possible in a
     15- or 16-bit device. Select Low, Medium or High.

5. Select whether you wish to render to a viewport or a full screen (see step 4
   above for limitations).

6. Configure any hardcopy device as needed.

7. Exit the configuration menu and save your changes.

AutoShade 2.1 Configuration
---------------------------
1. Install the Aquila files as described under installation.  Set the
   environment and font variables as described above under Basic and Font
   Configuration. Rerun your batch file if needed to initialize your environment
   variables.

2. Start AutoShade 2.1, with the reconfiguration command SHADE /R.

3. Select the correct pointing device.

4. Select option #2 "P386 Autodesk Device Interface display driver".

5. Choose option #1 to activate the list of display resolution modes for the
   interactive screen.  Select one.

6. Choose option #2 to activate the Color menu and select colors to use for
   Menus, Pop-ups, Background, etc.

7. Save and exit the colors menu.

8. Select option #2 "P386 Autodesk Device Interface rendering driver".

9. Choose a resolution mode for the rendering (shading and RenderMan) screen.

10.If you select the 32K or 64K color modes, you will be asked if you wish to
   enable "Band-Free" mode which allows the best color quality possible in a 15-
   or 16-bit device. Select Low, Medium or High.

11.Answer the next 3 questions with a "YES", since only one screen is used, and
   must be redrawn upon switching.

12.Select a hard copy device option.

13.Configuration is complete and the AutoShade main display should appear.


3D Studio 1.0 Configuration
---------------------------
Verify that the environment variables listed under Basic Configuration, above,
are initialized before proceeding with your 3D Studio configuration.

1. Go to your 3D Studio 1.0 subdirectory, e.g.,\3DS, and edit and make the
   following changes to the 3DS.SET file.
   * Change the line that starts with DEFAULT-DISPLAY = "VGA320X200" to read
     DEFAULT-DISPLAY = "RCPADI".
   * Change the line that reads MAIN-DISPLAY = to read MAIN-DISPLAY = RCPADI.
     Delete any leading semicolon (;) that may be present.
   * Change the line that reads MATERIAL-DISPLAY = VGA320X200 to read
     MATERIAL-DISPLAY = RCPADI.  Delete any leading semicolon.
   * Save the file and exit the editor.

2. Delete the file 3DADI.CFG, if present.

3. Start 3D Studio with the command 3DS.

4. To configure the Main Display, select Option 1 and select a 256-color
   resolution for the Main display. The Main Display mode will be used for the
   2D Shaper, 3D Lofter, 3D Editor, and Keyframer.

5. To configure the Materials Editor display, select Option 1 and select a
   256-color resolution. Use of a resolution greater than 640 x 480 will not
   increase the usefulness of the Materials Editor at all.

6. You should now find yourself inside the 3D Editor of 3D Studio.

7. The first time that you try to render a drawing or view an image, you will be
   asked to Configure the Rendering Device and select a resolution for Rendering
   . If you select the 32K or 64K color modes, you will be asked if you wish to
   enable "Band-Free" mode. This allows the best color quality possible in High
   Color modes. Select Low, Medium or High.

8. Configuration is now complete.


3D Studio 2.0 Configuration
---------------------------
Verify that the environment variables listed under Basic Configuration, above,
are initialized before proceeding with your 3D Studio configuration.

1. Go to your 3D Studio 2.0 subdirectory, e.g., the \3DS directory, and edit and
   make the following changes to  the 3DS.SET file.
   * Change the line that starts with RENDER-DISPLAY = VGA320X200 to read
     RENDER-DISPLAY = RCPADI.
   * Change the line that reads MAIN-DISPLAY = to read MAIN-DISPLAY = RCPADI.
     Delete any leading semicolon (;) that may be present.
   * Change the line that reads MATERIAL-DISPLAY = VGA320X200 to read
     MATERIAL-DISPLAY = RCPADI. Delete any leading semicolon that may be
     present.
   * Save the file and exit the editor.

2. Delete the file 3DADI.CFG, if present.

3. Start 3D Studio with the command 3DS. Answer Y to the question about having a
   VGA or SVGA.

4. To configure the Main Display, select Option 1 and select a 256-color
   resolution mode for the "ADI main display". The main display mode will be used
   for the 2D Shaper, 3D Lofter, 3D Editor, and Keyframer. Select any resolution
   , then select option 0 and exit.

5. To configure the Materials Editor display, select Option 1 and select a
   256-color resolution for the "ADI MEDIT", Materials Editor. Use of a
   resolution greater than 640 x 480 will not increase the usefulness of the
   Materials Editor at all.

6. Answer N to the question about "Will RDPADI render to a separate screen?".

7. Select a resolution mode for the Rendering "RDPADI" Device. If you select the
   32K or 64K color modes, you will be asked if you wish to enable "Band-Free"
   mode. This allows the best color quality possible in High Color modes. Select
   Low, Medium or High.

8. Answer the question about "Will RCPADI render to a separate screen?". If
   using Aquila for an 8514/A, the answer is "yes", for all others, the answer
   is "no".

9. Select a resolution mode for the Rendering "RCPADI" Device. Select the same
   resolution as you selected for step 7. This will be the active rendering
   resolution for most configurations.

10.Configuration is now complete.


Aquila Display List and Special Features for AutoCAD
----------------------------------------------------
AutoCAD Screen Layout
*  Current Color Display - The rectangle in the top left of the screen displays
   the current drawing color.
*  Logo - The manufacturer's logo is displayed near the lower right corner of
   the screen.
*  Display Status Area - This area is located below the Logo Area and is present
   only when the display list has been enabled. It contains three lines of text
   as follows:

   System Memory Status - The topmost line of text in the Display Status Area
   provides a percentage of total system memory that is being used by AutoCAD.
   AutoCAD may start to slow down when this amount exceeds 100%. After this
   figure exceeds 150%, "paging" will occur.

   Display/Screen Lists Memory Status - The middle line of text indicates memory
   usage by the Aquila display list and screen list.
      numberK   indicates amount of memory currently used by display list
      Empty     indicates there is no drawing in memory, anew drawing, this line
      Overflow  indicates the memory required by the display list exceeds
                available display list memory
      Disabled  indicates that the display list has been disabled because
                excessive paging has occurred

   Display List Status - The third or lowest line of the Display Status Area
   lists abbreviations to indicate the current status of display list features.
   Key letters are present only when the display list is enabled.

   D  32 bit display list data is in use.
   d  16 bit display list data has been selected.
   Z  Zooming from the display list is allowed.
   z  Pspace and perspective zooms by AutoCAD. Birds-eye View and Edge-Pan will
      not work in viewport.
   S  Redraw list is enabled. (this option is not available for  AutoCAD 12)
   s  Redraw list is turned off.
   P  Page alarm enabled and paging occurred recently.
   p  Page alarm enabled and no paging has occurred.
   E  Edge-pan enabled. Edge pan is impending.
   e  Edge-pan enabled but none impending.


Display List Memory Management Configuration for AutoCAD 11 and 12
------------------------------------------------------------------
This section covers the configuration of the Aquila display list memory
management features for AutoCAD available under option #4 of Aquila's AutoCAD
display configuration menu. The Aquila display list uses dynamic memory
management, wherein memory keeps on growing as it is needed. This requires a
minimum amount of operator interaction, and is almost carefree. Please pay
careful attention to the information presented here, since this will affect the
performance of Aquila under AutoCAD. Some experimentation will be necessary in
order to make Aquila work optimally for your particular environment and needs.

   1. The first option available in the Display List memory management submenu
      is "Enable Display List?". Answering "No" will end the display list
      configuration choices.
   2. If you are configuring for Release 12, you will next be asked "Enable 32
      bit regens?"  Enabling this feature will greatly reduce regens, thereby
      providing faster operation. The down side of this choice is that Aquila
      will use more memory for the display list. If you select "No" or if you
      are using AutoCAD 11, you will be configured for a 16-bit display list.
   3. Next you will be asked to select a dynamic memory management performance
      level; (1) "Miserly", (2) "Normal" or (3) "High Performance". If you have
      very little memory in your machine, then select Miserly.  If your have
      lots of memory, select High Performance. Otherwise, select Normal.
   4. If you are configuring for Release 11, you will be asked if you wish to
      "Enable redraw list?"  Answering "Yes" allows you to enable a faster
      redraw method. This will consume some additional memory, but it does
      improve redraw speeds.


Display List Feature Configuration for AutoCAD 11 and 12
--------------------------------------------------------
This section covers the configuration of the Aquila display list features
available under options #3 and #5 through #9 of the Aquila display configuration
menu for AutoCAD.


Graphics Flip-screen (Option #3)
--------------------------------
If enabled, the AutoCAD text screen will appear in the center of the graphics
screen. This eliminates the mode switching delay common to most multi-frequency
monitors. When enabled the graphics Flip-screen will emulate the VGA text window
. Use the F1 key to toggle between modes. If you wish to execute any DOS
commands, Aquila will switch the screen to a full-screen text mode allowing for
full DOS compatibility.

If you are using an after-market TSR product that pops up into the screen during
AutoCAD sessions (calculator, plot spooler, etc.) or you wish to use the
Print-screen function while in the text screen, then you should not use this
option. Flip-screen is automatically disabled for dual monitor operation.


Erase buffer (Option #5)
------------------------
Answering Yes to "Enable erase buffer?" brings up a second question "Erase
buffer size?". This will determine the number of erased objects it takes before
Aquila will start an automatic "cleaning" cycle to remove them from the display
list. Select a higher value if you plan on doing much large drawing editing. The
erase buffer can also be disabled, enabled and resized from within AutoCAD by
typing "AQEBUF=0" at the command prompt to disable and "AQEBUF=xx" to enable or
resize, where xx is the new size.

When AutoCAD erases objects from the drawing database, it erases them from the
screen as well. Sometimes this action causes other objects to appear erased as
well. The "redraw" command has no effect, but a "regen" causes the objects to
appear correctly. This problem can be solved by using the erase buffer to
correct the display corruption that occurs when objects are erased from the
drawing. Normally, AutoCAD will request that the driver erase a line from the
screen by drawing it in black. This causes the erased object to flash on and off
the screen during redraws.

Another side effect is that objects near the erased one may appear to be
incomplete. To correct this in the fastest manner possible, Aquila will keep a
list of erased vectors, and erase them only when the buffer fills. This speeds
up block erasures considerably. The custom command, AQCLN, discussed below, can
also be used to clear the erase buffer.

There are certain after market software packages for AutoCAD, such as CAD
Overlay, which rely upon the ability to draw objects in black (background color)
. If you are using one of these packages and the screen images appear distorted,
then you need to disable the erase buffer.


Paging Alarm (Option #6)
------------------------
Answering "Yes" to "Enable Page-Alarm?" will bring up a second prompt about the
sensitivity setting for the Page-Alarm.

When AutoCAD's memory requirements exceed the amount of physical memory
available in your machine, it begins "paging" in order to gain extra memory.
Paging means that certain memory areas are traded back and forth with a "swap
file" on the hard drive. Due to the difference in access speed between main
memory, and this "virtual" memory that is on the hard drive, AutoCAD begins to
slow down, often to the point of being unusable. To combat this, memory is used
very sparingly, and only when absolutely necessary. As a second line of defense
against paging, when the amount of memory paged out to disk exceeds several
preset thresholds, Aquila begins shutting down extra functions, and returns the
memory to AutoCAD.

When paging activity exceeds the first threshold, the screen-list feature is
disabled and all associated memory is returned to AutoCAD. At this point, the
screen list status line, the lowest line, will disappear from the status window.
Should paging activity continue, Aquila will disable the display list feature
and return all of that memory to AutoCAD. When that has been done, the middle
line of text in the status area will say "Disabled", to indicate that all
display list functionality has been terminated. The driver will continue to
function as normal, but redraws will be slower. However, AutoCAD itself will now
be much faster than it was when the paging was occurring. This allows you to
complete your drawing session in much less time.


Edge Pan (Option #7)
--------------------
Edge-pan is used to move around while zoomed into a drawing. By leaving the
cursor near the border of the currently active viewport, Aquila will
automatically begin to pan in that direction. This only begins if the cursor is
left idle for a predetermined length of time. The default is Edge-pan disabled.

Experimentation with the Edge-pan settings will yield the best results for your
needs. There are nine custom Edge-pan commands provided with the Aquila driver.
Edge-pan settings may be adjusted either in the configuration menu or within
AutoCAD by typing at the command prompt "AQEPAN ON" or " AQEPAN OFF".  Please
refer to the list of custom Aquila commands given below for additional custom
Edge Pan commands.


Birds-eye View (Option #8 & 9)
------------------------------
The Birds-eye feature allows fast transparent zooms and pans. The Birds-eye can
be activated either by typing "'AQBIRD" or by double-clicking on the mouse or
digitizer button specified during configuration.

When activated, the Birds-eye window will appear under the current cursor
location. The window will show a small overall view of the drawing that AutoCAD
has currently placed in Aquila's display list. Within the Birds-eye window a
highlighted rectangle in dicates the currently viewed area, and an outline
rectangle indicates the area that will be shown if a Birds-eye zoom is completed
. If this rectangle contains an "X" in the middle, then the Birds-eye is in pan
mode. If this rectangle contains an arrow, then the Birds-eye is in zoom mode.

Pressing the pick button on your mouse or digitizer (usually the left button for
a mouse) allows you to toggle between zoom and pan modes in the Birds-eye window
. Pressing the selection button on your digitizer causes the Birds-eye to
disappear and the selected view to be used in the currently active viewport. A
new zoom will be executed if necessary. Moving the cursor outside the Birds-eye
window without making a selection will cancel the function. This Birds-eye will
work in multiple viewport drawings, and will appear in the aspect ratio of the
currently active viewport.

The Birds-eye can be resized at any time during an AutoCAD session by typing
"AQBESZ=xx", where xx is any number between 10 and 50 and represents the
percentage of the graphics screen size for the new Birds-eye size. The image
inside the Birds-eye when it is activated can be manipulated without causing
a "regen" in Release 12 by using the "AQZWI" command. By performing a "ZOOM ALL"
followed by an "AQZWI", you will be able to zoom in and out of your drawing as
much as possible without causing further regens.


Band-Free Rendering
-------------------
When using the 15 or 16 bit rendering modes, often times the images appear
"banded". This banding or staircasing occurs most often on objects with large
sloping or gently curving surfaces. Band-Free rendering improves the image
quality in these modes.

The "Band-Free" effect can be controlled as well. It may be set to "Low",
"Medium", or "High", depending upon how much of the banding you want to
eliminate. This feature will be of limited use to users of AutoShade, but is
beneficial to users of Autodesk RenderMan and 3D Studio.


Custom Aquila Commands for AutoCAD
----------------------------------
Aquila provides a number of custom commands which provide status information
about memory usage for the Display list. Additional commands enable the user to
reset or redefine Aquila Edge-pan and Birds-eye features from within AutoCAD.
Below is a summary of the custom Aquila commands.

AQHLP           The help screen function displays a list of all the driver local
                commands, and gives a brief description of each. This command is
                best executed from the text or flip-screen.
AQDLQ           Displays on a text-or flip-screen all the viewports currently in
                use, along with some useful statistics about each one. This
                command is best executed from the text or flip-screen.
AQDRQ           Displays current display resolution and memory allocation
                statistics (CTRL-L provides the same function). When executed
                from the command prompt of the graphics screen instead of on a
                text screen, only a three-line summary will be given.
AQCLN           Removes objects from display list. "Cleans" the drawing display.
AQBIRD          Displays Birds-eye window underneath current cursor location.
                This command is not designed to work for paperspace or
                perspective viewports.
AQEPAN ON/OFF   Toggles on and off the Edge-pan feature.
AQPL            Pan to the left by 25 percent. Regens are never authorized by
                the pan or zoom in/out Aquila commands.
AQPR            Pan to the right by 25 percent.
AQPU            Pan up by 25 percent.
AQPD            Pan down by 25 percent.
AQZI            Zoom in by 50 percent.
AQZO            Zoom out by 50 percent.
AQZWI           "Zoom way in" while using the same scale factor, will cause a
                regen. By performing a ZOOM ALL followed by an AQZWI you may
                zoom around your drawing as much as possible without a regen.
                (AutoCAD 12 only)
AQBESZ=xx       Resize the Birds-eye window. Valid number is between 10 and 50,
                and it is a percentage of the graphics screen size.
AQPANSCR=xx     Amount of the viewport scrolled by the edge-pan feature. Valid
                number must be between 10 and 80, and it is a percentage of the
                viewport size.
AQPANBRD=xx     Width of the edge-pan border given in number of pixels. Valid
                number must be between 5 and 50.
AQPANTM1=xx     Amount of initial delay given in number of "clicks" or fractions
                of a second used before the edge-pan begins. Valid range is 10
                to 64.
AQPANTM2=xx     Amount of time before another edge-pan begins. Valid range is 1
                to 18.
AQEBUF=xx       Size of the erase buffer. Using 0 turns off the buffer.
