Int D4 Fn 20  - Pc-mos/386 V5.01 - Get Port And Baudrate Information       [O]

   AH = 20h
   BX = task ID (FFFFh for current task) (see AH=19h)

Return: CF clear if successful
       CX = port number (0000h if none)
       DI:SI = baudrate (if CX nonzero)
   CF set on error
       AX = error code (see #1366 at INT 21/AH=59h/BX=0000h)

See Also: INT 14/AH=0Ch"FOSSIL"