COMPUTER, NON-MASKABLE INTERRUPT TRACE ROUTINE OVERRIDE

System non-maskable interrupts are detected by an override controller which initiates an NMI routine override operation. During override, address requests for an standard NMI routine are intercepted, and instead a predetermined memory space is addressed that contains a system specific NMI trace routine. The processor is unaware that the override controller has inserted the system specific NMI routines. The processor executes the system specific NMI routines, and when the specific routines are completed, the override controller generates a termination signal which returns program control back to the standard NMI routine. The system specific NMI routine is designed to trace errors created by new system functions or hardware or to enhance the error tracing capability for existing system functions.