Int 14 Fn 800A  - Articom - Modify Flow Control                            [S]

   AX = 800Ah
   BL = flow control type (00h none, 01h XON/XOFF, 02h RTS/CTS)
   DX = port index (COM1=0, COM2=1, ...)

Return: AX = error code, if error (see #0286)

Note:  for attached ports only!

See Also: AX=8000h,AX=8003h,AX=8009h