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      STACKER NOTE                                         STACKER NOTE
                         STACKER COPROCESSOR DRIVERS
                (Applies to Stacker 3.1 for Windows and DOS)
      STAC FAX  31017 (11-23-1993)
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      BACKGROUND
      
      If your Stacker coprocessor was installed and working at the time
      you installed Stacker 3.1, you can configure Stacker 3.1 to
      resume using it by following these instructions.
      NOTE:  These instructions only apply if you are running Stacker
      3.1 for MS-DOS 6.
      
      SOLUTION
      
          Determine the base address for your AT/16 or XT/8
          coprocessor
          
          Add the coprocessor driver to your CONFIG.SYS file
          
          Restart your computer
           
      Determine the base address for your AT/16 or XT/8 coprocessor
      
      Skip to the last section, "Add the coprocessor driver to your
      CONFIG.SYS file," if you have the MC/16 coprocessor.
      
       1. From the DOS prompt, type STACKER and press <Enter>.
       
       2. Note the drive letter of the uncompressed drive which
          is exchanged with C (your boot drive).  The drive letter is
          displayed in the far right column.
       
       3. From the DOS prompt, type
                  
                  STACINI drive: <Enter>
          
          where drive: is the letter of the uncompressed boot drive.
       
       4. Locate the /B= switch.  If it's missing then skip to the
          next section, "Determine the base address using SDIAG."
          Otherwise, write down the number after the /B=.  This is the
          base address for your coprocessor.  The possible base
          addresses are:
           
                           AT/16             XT/8
                           -----             ----
                            200              C400
                            220              C800
                            240              CC00
                            260              D000
                            280              D400
                            2A0              D800
                            2E0              DC00
                                      
       5. The /B= switch has no effect in the STACKER.INI file. Move
          the cursor to this line and press DEL repeatedly to remove
          it.
       
       6. Press Ctrl+Z to save the file.  Skip to the last section,
          "Add the coprocessor driver to your CONFIG.SYS file."
           
      Determine the base address using SDIAG
      
       1. If the /B= switch is missing, press ESC to return to the DOS
          prompt.  You will need to run the program SDIAG_AT or
          SDIAG_XT to find the valid address for your coprocessor
          card.
       
       2. If you have the XT/8 card, disable your memory manager
          before testing for an address.
       
       3. To run SDIAG_AT or SDIAG_XT, type the following:
               
               SDIAG_AT (or SDIAG_XT) address <Enter>
          
          where address is a value from the above table. Through trial
          and error, you will test each of the seven possible
          addresses until SDIAG verifies the correct one.  The default
          address for the AT/16 card is 280 and C800 for the XT/8
          card, so try these first.
          
          If the address is valid you will see the following message:
               
               Address <address> Passed.
          
          Write down the address and skip to the section, "Add the
          coprocessor driver to your CONFIG.SYS file."
       
       4. If the address is not valid you will see the following
          message:
               
               Error: Data miscompare
               Address <address> Failed
          
          Before testing the next address, you must restart your
          system by either pressing the reset button or turning your
          computer off and on again.  Repeat steps 3 and 4 until you
          determine the correct address.
           
      Add the coprocessor driver to your CONFIG.SYS file
      
       1. To edit your CONFIG.SYS file, change to the root directory
          of drive C and type ED CONFIG.SYS and press <Enter>.
       
       2. Type one of these lines immediately before the line that
          begins with "DEVICE. . ." and ends with "...STACHIGH.SYS":
              
              DEVICE = C:\STACKER\LZS_XT8.SYS /B=base address
                                       or
              DEVICE = C:\STACKER\LZS_AT16.SYS /B=base address
                                       or
              DEVICE = C:\STACKER\LZS_MC16.SYS
          
          where base address is the address you determined in a
          previous step.
       
       3. Press Ctrl+Z to save the file.
       
       4. Restart your computer to put the change into effect.
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      Copyright 1993 Stac Electronics