Int 31 Fn FF09  P - Causeway - "setseldet" - Set Selector Base And Limit   [E]

   AX = FF09h
   BX = selector
   CX:DX = new base address
   SI:DI = new byte-granular limit

Return: CF clear if successful
   CF set on error

See Also: AX=FF07h,AX=FF0Ah