Int 31 Fn FF26  P - Causeway - "setdostrans" - Set Dos Transfer Buffer     [E]

   AX = FF26h
   BX = real-mode segment of new transfer buffer
   ECX = new transfer buffer size
   DX = protected-mode selector for new transfer buffer

Return: nothing

Note:  the specific buffer must be located in conventional memory; only the
     first 64K will be used

See Also: AX=FF25h