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      STACKER NOTE                                         STACKER NOTE
                     DOS PROTECTED MODE SERVICES (DPMS)
                          (Applies to Stacker 4.0)
      STAC FAX  4106 (06-24-1994)
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      BACKGROUND
      
      DPMS (DOS Protected Mode Services) is a new memory-management
      standard. It takes a part of extended memory, not available to
      many programs, and lets the system use it safely. If Stacker uses
      DPMS, it won't need much conventional memory at all -- just
      enough for the DPMS driver.
      
      Stacker Setup will give you DPMS if your system can use it. Your
      computer must:
      
         - Be a '386 or better
         - Have more than 1 MB of RAM
         - Use preloaded compression (MS-DOS 6 and above)
           
      Does your computer use DPMS?
      
      If your computer seems to qualify for DPMS, you might want to
      check to see if it really uses DPMS.
      
           First examine your CONFIG.SYS file (use ED or any text
           viewer or editor). If you see lines like these, you are set
           up for DPMS:
           DEVICE=C:\STACKER\DPMS.EXE
           DEVICEHIGH=C:\STACKER\STACHIGH.SYS
      The STACHIGH line causes DOS to store the Stacker cache in
      extended memory. The DPMS line defines the DPMS space in extended
      memory; the rest of the Stacker driver will be stored here. These
      two lines must be in this sequence, and your system must be able
      to use extended and upper memory.
      
      Notice that DPMS is not loaded high. If you use a memory manager
      such as MEMMAKER, that uses DEVICEHIGH for this line, just edit
      the CONFIG.SYS file (use ED) and change "DEVICEHIGH" to "DEVICE"
      on this line.
      
           Next, watch the messages when you start up your computer.
           Just after the Stacker message, you should see a message
           beginning with "DPMS" and followed by Novell copyright
           information.
           Finally, you can see how much space Stacker uses in memory.
           Here's how:
       1.  Get to a DOS prompt.
       2.  Type MEM /C /P and press ENTER.
       3.  Examine the result. You'll see that DPMS is in conventional
           memory and takes less than 2 KB. STACHIGH is in upper memory
           and takes about 16 KB if you are using 8KB clusters. See
           StacFax 4517 for the size of the Stacker driver in memory
           with different configurations. No other Stacker components
           occupy conventional or upper memory.
           
      Controlling DPMS
      
      You can turn DPMS off if necessary. If you do, the Stacker driver
      will take up more space in lower memory.
      
      You can turn DPMS on or off at the DOS prompt. Of course, DPMS
      won't work unless the DPMS.EXE file is stored on your hard disk
      and referenced by a DEVICE= line in your
      CONFIG.SYS file.
      
      To control DPMS from the DOS prompt:
      
       1. Get to a DOS prompt.
       2. Type CONFIG /D- to turn it off or CONFIG /D to turn it on.
       3. Restart your computer.
           
      To manually turn off DPMS through CONFIG.SYS edit the CONFIG.SYS
      file (use ED) and type REM and a space at the beginning of the
      DPMS.EXE line.
      
      To manually turn DPMS back on through CONFIG.SYS edit the
      CONFIG.SYS file (use ED) and delete REM and any spaces at the
      beginning of the DPMS.EXE line. Remember that whenever you modify
      the CONFIG.SYS, you must restart your system for the changes to
      take effect.
      
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      Copyright 1994 Stac Electronics
