--- nand.py-
+++ nand.py
@@ -22,16 +22,12 @@
 		sched.enque(self.latency, f, args)
 
 class Pin(Obj):
-	def __init__(self, parent, name, direc='IO', v=None):
+	def __init__(self, parent, name, v=None):
 		Obj.__init__(self, parent, name)
-		self.direc = direc
-		self.v = v
+		self.v = None
 		self.conn = None
-
-	def connect(self, other):
-		self.conn = other
-		if other and other.conn != self:
-			other.conn = self
+		if v != None:
+			self.enque( self.set, (v,) )
 
 	def set(self, v):
 		v = bool_v(v)
@@ -39,21 +35,18 @@
 			return
 		self.v = v
 		self.dbgout( str_v(v) )
-		if self.has('O') and self.conn:
+		if self.conn:
 			self.conn.set(v)
-		if self.has('I') and self.parent and hasattr(self.parent, 'update'):
+		elif self.parent and hasattr(self.parent, 'update'):
 			self.enque(self.parent.update)
 
-	def has(self, direc): # direc 'I' or 'O'
-		return direc in self.direc
-
 class Foo(Obj):
 	def __init__(self, parent, latency=None):
 		Obj.__init__(self, parent, 'foo', latency)
 		self.v = 0
 
-		Pin(self, 'inp', 'I')
-		Pin(self, 'out', 'O')
+		Pin(self, 'inp')
+		Pin(self, 'out')
 
 		self.enque( self.add, (0, ) )
 
@@ -70,9 +63,9 @@
 class NAND(Obj):
 	def __init__(self, parent, name='nand', latency=10):
 		Obj.__init__(self, parent, name, latency)
-		Pin(self, 'out', 'O')
-		Pin(self, 'inp_a', 'I')
-		Pin(self, 'inp_b', 'I')
+		Pin(self, 'out')
+		Pin(self, 'inp_a')
+		Pin(self, 'inp_b')
 
 	def update(self):
 		self.dbgout('update')
@@ -84,30 +77,25 @@
 		Obj.__init__(self, parent, name, latency)
 		self.pins = []
 
-	def connect(self, other_pin):
-		direc = { 'I': 'O', 'O': 'I' }.get(other_pin.direc, 'IO')
-		pin = self.new_pin(direc)
-		pin.connect(other_pin)
-
-	def new_pin(self, direc='IO'):
+	def new_pin(self):
 		i = len(self.pins)
-		name = 'pin{}_{}'.format(i, direc)
-		pin = Pin(self, name, direc)
+		name = 'pin{}'.format(i)
+		pin = Pin(self, name)
 		self.pins.append(pin)
 		return pin
 
 	def update(self):
-		ivs = [ pin.v for pin in self.pins if pin.has('I') ]
+		ivs = [ pin.v for pin in self.pins if not pin.conn ]
 		f = lambda r, v: r if v == None else ( v if r == None else r or v ) # OR
 		v = reduce(f, ivs, None)
 		for pin in self.pins:
-			if pin.has('O'):
+			if pin.conn:
 				pin.set(v)
 
 class Lamp(Obj):
 	def __init__(self, parent, name='lamp', latency=None):
 		Obj.__init__(self, parent, name, latency)
-		Pin(self, 'inp', 'I')
+		Pin(self, 'inp')
 
 	def update(self):
 		msg = str_v( self.inp.v )
@@ -183,8 +171,8 @@
 	slow_12 = Obj(o, 'slow_12')
 	Foo(slow_12, 12)
 
-	o.foo.out.connect( o.slow.foo.inp )
-	o.slow.foo.out.connect( o.slow_12.foo.inp )
+	o.foo.out.conn = o.slow.foo.inp
+	o.slow.foo.out.conn = o.slow_12.foo.inp
 	sched.enque( 200, o.foo.out.set, ('H',) )
 
 	NAND(o)
@@ -198,13 +186,13 @@
 	NAND(test1)
 	Joint(test1)
 	Lamp(test1)
-	o.test1.jt.connect( o.test1.nand.out )
-	o.test1.jt.connect( o.test1.nand.inp_a )
-	o.test1.jt.new_pin('O').connect( o.test1.lamp.inp )
+	o.test1.nand.out.conn = o.test1.jt.new_pin()
+	o.test1.jt.new_pin().conn = o.test1.nand.inp_a
+	o.test1.jt.new_pin().conn = o.test1.lamp.inp
+
 	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.enque( (3,0), o.test1.lamp.inp.set, ('L',) )
 
 	sched.main_loop()