INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - ALLOCATE MEMORY
        AX = FB42h
        BX = 0002h
        CX = size in bytes
        DX = bit flags
            bit 2: set to allocate DOS memory, clear for DPMI memory
        SI = selector of descriptor to be modified to access allocated memory
        DI = selector of a second descriptor to be modified
Return: AX = ??? or 0000h on error
        CX:DX = linear base address of DPMI memory block
        SI:DI = handle for DPMI memory block or FFFFh:FFFFh
        ???
Note:   two segment descriptors may be set if a code and an aliased data
          segment are required; if only one descriptor is needed, SI should
          equal DI on entry
BUG:    when allocating DOS memory, the code computes the linear address by
          multiplying the segment number by 4 rather than shifting by 4
SeeAlso: AX=FB42h/BX=0008h