Codetapper wrote: NMI Autovector is when a non maskable interrupt occurs. Usually reset switches such as the button on the Action Replay cartridge cause these to occur, but it also happens with some TCP/IP stacks and other hardware (perhaps your CD drive is generating them?). If that error occurs all the time, simply download the development archive and copy the s:whdload.prefs file and set that NOAUTOVEC flag globally. Then all installs will automatically use it.