Int 21 Fn 2509  P - Flashtek X-32vm - Get System Segments And Selectors    [E]

   AX = 2509h

Return: CF clear
   EAX high word = default DS
   AX = alias for 16-bit data segment
   BX = real mode code segment
   EDX high word = selector covering full 4GB address space
   DX = default SS
   ESI high word = PSP selector
   SI = environment selector