Some changes have been made to corect some problems in 
Project 2. 

Changes:
1. declaration of function alarm_scan was removed from alarm.h

2. alarmtest1,2 were modified to have the timeouts in millisecondsj
	instead of microseconds.

3. maintester.c was modified to have some user level code in function
	wait(). The lack of user code prevents any interrupts to be generated.
	
You can either make the above changes yourself or download
and substitute files alarm.h, alarmtest1.c and alarmtest2.h