a computer system provides a vector monitor for monitoring a first instance of an error - handling vector in architected memory . the monitoring can involve repeatedly comparing the first instance with a second instance of the vector so as to detect a mismatch , should it occur . if a mismatch is detected , the vector monitor can notify an administrator , automatically initiate diagnostic routines , and / or correct the mismatch . as a result , potential fatal events in which firmware confronts a corrupted error - handling vector are less likely to occur .