ncsim> run
                   0A=0010 B=1111 Sel=00 sum=0001	//2+(-1) = 1
                  10A=0010 B=1111 Sel=01 sum=0011	//2-(-1) = 3
                  15A=0010 B=1111 Sel=10 sum=0011	//2+1 = 3
                  20A=0010 B=1111 Sel=11 sum=0001	//2-1 = 1
                  25A=0100 B=0111 Sel=00 sum=1011	//4+7 = 11 (overflow)
                  35A=0100 B=0111 Sel=01 sum=1101	//4-7 = -3
                  40A=0100 B=0111 Sel=10 sum=0101	//4+1 = 5
                  45A=0100 B=0111 Sel=11 sum=0011	//4-1 = 3
                  50A=1011 B=1000 Sel=00 sum=0011	//(-5)+(-8) = 3 (overflow)
                  60A=1011 B=1000 Sel=01 sum=0011	//(-5)-(-8) = 3
                  65A=1011 B=1000 Sel=10 sum=1100	//(-5)+1 = -4
                  70A=1011 B=1000 Sel=11 sum=1010	//(-5)-1 = -6
                  75A=1000 B=1011 Sel=00 sum=0011	//(-8)+(-5) = 3 (overflow) 
                  85A=1000 B=1011 Sel=01 sum=1101	//(-8)-(-5) = -3
                  90A=1000 B=1011 Sel=10 sum=1001	//(-8)+1 = -7
                  95A=1000 B=1011 Sel=11 sum=0111	//(-8)-1 = 7 (overflow)
Simulation complete via $finish(1) at time 100 NS + 0
.\hw2\aluTB.v:67 	$finish;