Int 2F Fn FB42  PU - Borland C++ Dpmiload.exe - Get Available Memory       [E]

   AX = FB42h
   BX = 0003h

Return: DX:AX = size of largest free block in paragraphs
       0000h:0000h on error (BC3.0 version only)

Note:  AX and DX are destroyed on error, but no other error indicator is
     returned, under the BC++ 2.0 version of DPMILOAD

See Also: AX=FB42h/BX=0002h