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/ohp3:[-]size           Overlay stash in EMS, force version 3.0 compatibility.
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 Syntax:

 Use - to leave memory free.  Size is the size of the overlay stash in
 kilobytes.  It can range from 0 to 16383.

 Description:

 This option operates  identically to the /ohp option except that it forces
 use of the EMS 3.0  stashing algorithm.  You may need to use /ohp3 because
 some  EMS  drivers incorrectly  report  EMS 4.0  compatibility  while not 
 supporting direct lower memory mapping. The /ohp3 option forces the overlay
 manager to use the less efficient EMS 3.0 technique even if version 4.0 EMS
 is detected.  Since this may only be a problem on a few older 80286 and 
 8088/8086 machines, you should use /ohp3 only when necessary or in order to
 anticipate all possible problem scenarios. Unnecessary use of /ohp3 reduces
 efficiency and provides less speed increase at runtime, as compared to using
 the /ohp option.  /ohp3 overlay file stashing will not occur if the overlay
 manager detects less than 80K free EMS or an EMS driver is not present. All
 EMS  memory allocated for use by  /ohp3  is automatically freed at program
 termination.

 Use of the EMS page frame as the overlay pool (/ox option) prevents EMS 3.0
 overlay file stashing. The /ox option automatically shuts off such stashing
 because EMS 3.0 routines must map into the EMS page frame that  /ox uses to
 hold the overlay pool that the stashed overlay is being copied to.  If you
 use /ohp3 and /ox, the /ohp3  setting is ignored by the overlay manager and 
 only /ox setup will occur.

 Clipper User Note:

 If you use the /ohp3 option, the Clipper 5 debugger CLD.EXE will not
 function with your program.  Use WarpMod to turn this option off and
 on quickly, if necessary.