Quiz submission record for quiz6-2-2 at Thu Jul 29 05:46:54 2004: Your Answer for Question 1: EPC - execution program counter keeps track of where an interrupt occured and cause stores the reason why the interrupt occurs. Allows us to branch there when we need to. Your Answer for Question 2: Exceptions that fail to tell us what was the casue of the interrupt. Your Answer for Question 3: Can spend too much computer resources polling for memory/disk that can be very large. Your Answer for Question 4: IO that has a reference in memory. Allows for each instruction to be stored and for exceptions to be handled. Your unique submission ID is quiz6-2-2-cs61c-cf-1091105214-3125.