Int 33 Fn 256C - Logitech Mouse - Set Parameters - Set Baud Rate (serial [M] AX = 256Ch BX = 0000h CX = rate (0=1200, 1=2400, 2=4800, 3=9600) Return: AX = FFFFh if driver installed for serial mouse See Also: AX=246Ch,AX=256Ch/BX=0001h,AX=256Ch/BX=0002h,AX=276Ch