#Registers
#g1 primary use is for the Product also used for a zero test before the Product
#g4 used for the input value and as a counter for the Product function
#g5 used for a comparison store and for a zero value

Main					#Start of Program
	GETPORT IN0, $g4		#Pulls Value of Input Port 0 (The Value to be Multiplied)
	SUB $g5, $g5			#Zeroes $g5 and $g1
	SUB $g1, $g1
	
PreInt					#Loops Until second interupt is set to value other than 0
	SETPORT OUT0, $g4		#Displays the value input by the user
	GETPORT IN1, $g5		#Pulls value from Input Port 1 (Product Trigger)
	BEQ $g1, $g5, PreInt		#performs check for Second Interrupt set to nonzero

	SUB $g5, $g5			#Zeroes $g5 and $g1(result reg)
	SUB $g1, $g1
	BNE $g4, $g5, Finish		#If $g4 is zero it goes straight to the end

Product					#Contains the Multiply algorithm
	ADDI $g1, 255			#Adds 255 to the result register
	SUBI $g4, 1			#Deincrements Input
	SUB  $g5, $g5			#Zeroes $g5
	BNE  $g4, $g5, Product		#Checks for #g4 being 0(done)
	ADDI $g5, 65535			#Sets #g5 to 65535
	SLT  $g1, $g5, $g5		#Checks for result less than 65535
	SUB  $g4, $g4			#zeroes #g4
	BEQ  $g4, $g5, Finish		#If result is less than 65535 goes to finish  

	SUB $g1, $g1			#else result is replaced with zero

Finish 
	SETPORT OUT0, $g1		#outputs result