Quiz submission record for quiz6-2-2 at Wed Jul 28 21:02:13 2004:

Your Answer for Question 1:
The EPC is used to hold the address of the affected instruction.
The cause is used to record the cause of the exception. 
The interrupt handler (at address 0x80000080) accesses the EPC and the Cause.

Your Answer for Question 2:
Exceptions that are not are not associated with the exact instruction that was teh cause of the exception. (Pipelined computers)

Your Answer for Question 3:
The overhead associated with it. It consumes almost 20% of the processor in the example given.

Your Answer for Question 4:
Portions of the address space are assigned to io devices and reads and writes to those addresses are interpreted as commands to the IO device. 
loop: la $t0, 0xffff0000
        lbu $t1, 0($t0)
        beq $t1, $0, loop
        move $t1, $v0


Your unique submission ID is quiz6-2-2-cs61c-eg-1091073733-2274.