___________________________________________________________________________
STACKER NOTE                                                   STACKER NOTE
Title: Loading Stacker into High Memory.
STAC FAX Index #2101 - 7/09/91                           
___________________________________________________________________________

Background.
    
    To conserve base memory, it is possible to load the Stacker driver into
    high memory (between 640K and 1024K) on systems with 80286 chips and
    higher.  Appropriate memory management software (QRAM, MOVE'EM, QEMM386,
    386MAX) and hardware are needed.  Loading high on an 80286 machine
    requires hardware support for Expanded Memory Specification (EMS) 4.0
    (see User's Manual, "Loading Stacker into High Memory").

    Note: For loading high using MS-DOS 5.0's DEVICEHIGH, see STACKER NOTE
          TEC015 (STAC FAX index #2102),"Loading Stacker High with 
          MS-DOS 5.0". 

Potential problems with loading the Stacker device driver high.

      1. Crowding in high memory, resulting in disk-read errors;
      2. Erratic behavior of memory-intensive programs;
      3. Exclude-phrases omitted from the memory manager device line (Stacker
         coprocessor version only);
      4. Load-high driver not invoked in STACKER.COM device driver line;
      5. Stacker cache (/M=xx) specified at excessive size;
      6. insufficiently large block of contiguous memory between 640K and 
         1024K.

Recommended Actions.

      1. Consult documentation for memory manager to verify syntax in
         CONFIG.SYS.  

      2. If applicable, edit load-high driver line to exclude range used by
         coprocessor card (see User's Manual, "Re-enabling Memory Managers").
         Note that the correct syntax for the AT&T 6300's AEMM.SYS is 
         /X=addr-addr.

      3. Verify syntax of load-high statement in STACKER.COM device driver 
         line (see User's Manual, "Loading Stacker into High Memory").

      4. Reduce size of STACKER disk cache (/M=xx switch in STACKER.COM 
         device driver line).

      5. To verify load-high status, use a memory-mapping utility such as
         Quarterdeck's MANIFEST.  If Interrupts 25 and 26 are at a segment 
         value above A000, then Stacker is loaded high.

___________________________________________________________________________
Copyright 1993, Stac Electronics