Int 33 Fn 256C - Logitech Mouse - Set Parameters - Set Report Rate (seri [M] AX = 256Ch BX = 0002h CX = rate (0=10, 1=20, 2=35, 3=50, 4=70, 5=100, 6=150) Return: AX = FFFFh if driver installed for serial mouse See Also: AX=246Ch,AX=256Ch/BX=0001h,AX=256Ch/BX=0003h,AX=276Ch