The latest version of MPLAB should work with it. Also, the latest Microsoft drivers have an option allowing the wheel to be used even in programs which don't explicitely support it. James Grosbach Microchip Technology ____________________Reply Separator____________________ Subject: Anyone know how to make the Microsoft Intellimouse work in M Author: JBellini@STATPOWER.COM (John Bellini) Date: 11/9/98 11:33 AM Anyone know how to make the Microsoft Intellimouse work in MPLAB? John B.