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 Using the High Memory Area
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     If you are running CA-Clipper/ExoSpace on an older machine (manufactured
     before 1989), and PMINFO reports less memory than your hardware
     documentation specifies that your manufacturer may be counting extra
     memory as extended memory.  The High Memory Area (HMA) is the area below
     1 MB but above the 640 KB conventionally used by DOS.

     For example, an AST machine may be documented to have 2 MB of extended
     memory, but PMINFO reports only about 1.7 MB, because AST utilizes HMA.
     Some manufacturer-specific RAM drives also use the HMA.

     CA-Clipper/ExoSpace automatically utilizes this memory on a Compaq 386
     machine, but it does not recognize it on other machines.  You can set
     the DOS16M environment variable to test the memory between 640 KB and
     1 MB and use whatever it finds that is not read-only memory.  To try
     this, use the + option in your DOS16M environment variable setting:

     SET DOS16M= +

     If implementing this setting only makes the problem worse, remove the
     setting and reboot your machine.