Int 31 Fn FF0A  P - Causeway - "setseldet32" - Set Selector Base And Limi  [E]

   AX = FF0Ah
   BX = selector
   EDX = new base address
   ECX = new byte-granular limit

Return: CF clear if successful
   CF set on error

See Also: AX=FF08h,AX=FF09h