___________________________________________________________________________
STACKER NOTE                                                   STACKER NOTE
Title: Stacker 1.x Memory Requirements
STAC FAX Index #2501 - 5/15/92                          
___________________________________________________________________________

Background.

The Stacker device driver, STACKER.COM , requires a modest amount of
resident conventional memory.  The resident size of the Stacker device
driver depends on the Stacker product being used, and on the way
Stacker is configured.  During the initialization phase, as it is
loading and mounting the Stacker drives, it requires slightly more
memory than when resident.

Refer to the following tables to determine how much memory the Stacker
device driver requires.  These numbers should be used as guidelines.
Once Stacker is installed, observe the Stacker.COM display as the
system starts to see the exact amount of memory the driver is using.

      Starting sizes in bytes, without Stacker cache (/M=0)

                                    Coprocessor             Software
                                      Version               Version

      1st volume  (with 4KB clusters): 21,504                30,720
                  (with 8KB clusters): 25,600                38,912
                      add'l volumes:    3,072 each            3,072 each

      When Stacker loads at boot time, the size of the driver (both initial 
      and resident) is displayed.


How does the Stacker cache affect the device driver size?

   If the Stacker cache has been specified, the driver size will 
   increase by the amount specified (in Kbytes) for cache allocation.  The 
   size is specified with the /M=xx switch on the Stacker device line in 
   Config.sys.  Values range from 0-64.  For example: 
            
   DEVICE=C:\STACKER\STACKER.COM C:\STACVOL.000 /m=64 
             
   The /m=64 will create a 64 K cache and add 64K to the size of the driver.  
   If you find your programs complain about insufficient memory, or the 
   driver will not load into upper memory, reduce the size of the cache.  
   Note: the device driver can be reduced by an additional 9K if using the 
   coprocessor, and setting /m=0.

Can the Stacker driver be loaded into Upper Memory?

   The Stacker device driver can be loaded "high" like any other driver. 
   Just follow your memory manager's instructions.  It is desirable to make 
   the driver as small as possible, so it may be necessary to reduce the size
   of the cache. See STAC FAX index # 2102 "Loading Stacker High with DOS 5.0" for more on using the DOS 5.0/Windows 3.1  
   memory manager to load Stacker high.

___________________________________________________________________________
Copyright 1993, Stac Electronics