--- nand.py-
+++ nand.py
@@ -116,12 +116,12 @@
 class Sched:
 	def __init__(self):
 		self.que = []
-		self.now = 0
+		self.now = tm_tup(0)
 	
 	def enque(self, latency, f, args=() ):
 		tm = self.now
 		if latency:
-			tm = tm + latency
+			tm = tm_add( tm, tm_tup(latency) )
 		t = (tm, f, args)
 
 		if self.exist_same(t):
@@ -130,7 +130,7 @@
 		n = len(self.que)
 		while n > 0:
 			(tm_n, _, _) = self.que[ n - 1 ]
-			if tm >= tm_n:
+			if tm_gt(tm, tm_n) or tm == tm_n:
 				break
 			n -= 1
 		self.que.insert(n, t)
@@ -150,9 +150,25 @@
 def bool_v(v):
 	return {'H': True, 'L': False, 'Hi-Z': None }.get(v, v)
 
+def tm_tup(v):
+	return (0, v) if type(v) == int else v
+
+def tm_gt( (s1,n1), (s2,n2) ):
+	return n1 > n2 if s1 == s2 else s1 > s2
+
+def tm_add( (s1,n1), (s2,n2) ):
+	giga = 1000000000
+	n1 += n2
+	s1 += s2 + n1 / giga
+	n1 %= giga
+	return (s1, n1)
+
+def tm_str( (s,n) ):
+	return '{}.{:0>9}'.format(s, n)
+
 def dbgout(s, always=False):
 	if always or '-v' in sys.argv:
-		print '{} {}'.format( sched.now, s )
+		print '{} {}'.format( tm_str(sched.now), s )
 		sys.stdout.flush()
 
 if __name__ == "__main__":
@@ -188,6 +204,8 @@
 	sched.enque( 400, o.test1.nand.inp_b.set, ('H',) )
 	sched.enque( 500, o.test1.nand.inp_b.set, ('L',) )
 
+	sched.enque( (2,0), o.test1.lamp.inp.set, ('L',) )
+
 	sched.main_loop()
 
 # EOF