Int 31 Fn 0501  P - DPMI 0.9+ - Allocate Memory Block                      [E]

   AX = 0501h
   BX:CX = size in bytes

Return: CF clear if successful
       BX:CX = linear address of block
       SI:DI = memory block handle for resizing and freeing block
   CF set on error
       AX = error code (DPMI 1.0+) (8012h-8014h,8016h,8021h)(see AX=0000h)

Notes: no selectors are allocated
   the memory block is allocated unlocked (can be locked with AX=0600h)
   allocations are often page granular (see AX=0604h)
   under MS Windows 3.10 Enhanced mode with paging enabled, it is possible
     for this function to fail even if AX=0500h indicates that enough
     memory is available

See Also: AX=0000h,AX=0100h,AX=0500h,AX=0502h,AX=0503h,AX=0504h,AX=0D00h

See Also: INT 2F/AX=FB42h/BX=0002h