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STACKER NOTE                                                   STACKER NOTE
Title: DR DOS and Stacker
STAC FAX Index #2301 - 2/20/92                          
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Background.

   Stacker is compatible with Digital Research DOS (DR DOS) versions 5.0 and 
   6.0.  However, there are some special considerations when using either
   version of this operating system.

DR DOS 6.0.

   1. DR DOS 6 is bundled with another file compression program.  There
      is no reason to use this program if you have chosen to use Stacker.  
      Stacker gives you better speed, better compression, a smaller 
      device driver, and more advanced features than the compression program 
      that comes with DR DOS.

   2. Installing DR DOS 6.0 after Stacker is installed may require a special
      procedure.  See STAC FAX index #2303. 
      "Upgrading to DR DOS 6.0 with Stacker Installed" for details.

DR DOS 5.0 and 6.0.
     
   If you configure Stacker to use EMS for its cache, or if you load the 
   Stacker device driver into upper memory, the following message will be 
   displayed by the Stacker device driver when you start your computer:

   NOTE: "In DR DOS, loading Stacker high (or using /EMS)
          may slow disk access.  Please see the Stacker README
          file for help."

   This condition can be remedied by using the /ND parameter on the
   STACKER.COM device line in Config.sys.  Use the /ND parameter if your
   hard disk controller is NOT a bus-master controller.  (If you are
   unsure of  whether your disk controller is a bus-master, it probably
   isn't.)  If you DO use a bus-master disk controller and it does not
   support virtual DMA, DO NOT use the /ND switch to increase disk
   performance.

   If you do not use the /ND parameter and wish to suppress the warning
   message, place the /NW (no warning) parameter on the Stacker DEVICE
   statement in the CONFIG.SYS file.

DR DOS 5.0.

   Under DR DOS 5.0,  the SSWAP option does not operate properly with
   Stacker versions 1.0-1.11.  It is recommended that you upgrade to Stacker
   version 2.0 in order to SSWAP the Stacker drives.

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Copyright 1993, Stac Electronics