INT 33 - LOGITECH MOUSE - SET PARAMETERS - SET MOUSE PORT (SERIAL MOUSE ONLY) AX = 256Ch BX = 0003h CX = port (1, 2) Return: AX = FFFFh if driver installed for serial mouse SeeAlso: AX=246Ch,AX=256Ch/BX=0000h,AX=256Ch/BX=0004h,AX=276Ch