diff --git a/11/11.py b/11/11.py
new file mode 100755
index 0000000..1cc1bbf
--- /dev/null
+++ b/11/11.py
@@ -0,0 +1,271 @@
+#!/usr/bin/env python3
+
+import sys
+
+# run with '2' argument for part2 result.
+part2 = (len(sys.argv) == 2 and sys.argv[1] == '2')
+
+class IntComp:
+  def __init__(self, instructions, id):
+    self.instructions = instructions
+    self.pcounter = 0
+    self.finished = 0
+    self.ampid = id
+    self.inputs = []
+    self.relbase = 0
+
+  def terminated(self):
+    return self.finished
+
+  def r(self, pos, mode):
+    wantedpos = None
+    if mode == 0:
+      wantedpos = self.instructions[pos]
+    elif mode == 1:
+      wantedpos = pos
+    elif mode == 2:
+      wantedpos = self.relbase + self.instructions[pos]
+    else:
+      print ("Invalid mode!", mode)
+      exit(1)
+
+    # Allow reading from 'new' memory.
+    if wantedpos >= len(self.instructions):
+      for i in range(len(self.instructions), wantedpos+1):
+        self.instructions.append(0)
+
+    return int(self.instructions[wantedpos])
+
+
+  def w(self, pos, v, mode):
+    wantedpos = None
+    if mode == 0:
+      wantedpos = self.instructions[pos]
+    elif mode == 1:
+      wantedpos = pos
+    elif mode == 2:
+      wantedpos = self.relbase + self.instructions[pos]
+    else:
+      print ("Invalid mode!", mode)
+      exit(1)
+
+    # Allow writing to 'new' memory.
+    if wantedpos >= len(self.instructions):
+      for i in range(len(self.instructions), wantedpos+1):
+        self.instructions.append(0)
+
+    self.instructions[wantedpos] = v
+
+  def perform(self, inputs):
+    outputs = []
+
+    for inp in inputs:
+      self.inputs.append(inp)
+
+    while 1:
+      fullopcode = self.instructions[self.pcounter]
+      opcode = fullopcode % 100
+      mode_c = (int(fullopcode/100) % 10)
+      mode_b = (int(fullopcode/1000) % 10)
+      mode_a = (int(fullopcode/10000) % 10)
+      pos_c = self.pcounter+1
+      pos_b = self.pcounter+2
+      pos_a = self.pcounter+3
+
+      #print(self.ampid, "OP:", opcode, mode_c, mode_b, mode_a, pos_c, pos_b, pos_a)
+
+      # add
+      if opcode == 1:
+        val = self.r(pos_c,mode_c) + self.r(pos_b,mode_b)
+        self.w(pos_a, val, mode_a)
+        self.pcounter += 4
+
+      # multiply
+      elif opcode == 2:
+        val = self.r(pos_c, mode_c) * self.r(pos_b, mode_b)
+        self.w(pos_a, val, mode_a)
+        self.pcounter += 4
+
+      # input
+      elif opcode == 3:
+        print ("input:", self.inputs)
+        store = self.inputs.pop(0)
+        self.w(pos_c, store, mode_c)
+        self.pcounter += 2
+
+      # output
+      elif opcode == 4:
+        outputs.append(self.r(pos_c, mode_c))
+        self.pcounter += 2
+        #print("output:", outputs)
+        return (outputs, self.finished)
+
+      # jump-if-true
+      elif opcode == 5:
+        t = self.r(pos_c, mode_c)
+        if t != 0:
+          self.pcounter = self.r(pos_b, mode_b)
+        else:
+          self.pcounter += 3
+
+      # jump-if-false
+      elif opcode == 6:
+        t = self.r(pos_c, mode_c)
+        if t == 0:
+          self.pcounter = self.r(pos_b, mode_b)
+        else:
+          self.pcounter += 3
+
+      # less-than
+      elif opcode == 7:
+        c = self.r(pos_c, mode_c)
+        b = self.r(pos_b, mode_b)
+        if c < b:
+          self.w(pos_a, 1, mode_a)
+        else:
+          self.w(pos_a, 0, mode_a)
+        self.pcounter += 4
+
+      # equals
+      elif opcode == 8:
+        c = self.r(pos_c, mode_c)
+        b = self.r(pos_b, mode_b)
+        if c == b:
+          self.w(pos_a, 1, mode_a)
+        else:
+          self.w(pos_a, 0, mode_a)
+        self.pcounter += 4
+
+      # adjust-relbase
+      elif opcode == 9:
+        c = self.r(pos_c, mode_c)
+        self.relbase += c
+        self.pcounter += 2
+
+      # stop
+      elif opcode == 99:
+        self.finished = 1
+        break
+
+    return (outputs, self.finished)
+
+def turnleft(dir):
+  if dir == "U":
+    return "L"
+  elif dir == "L":
+    return "D"
+  elif dir == "D":
+    return "R"
+  elif dir == "R":
+    return "U"
+
+def turnright(dir):
+  if dir == "U":
+    return "R"
+  elif dir == "R":
+    return "D"
+  elif dir == "D":
+    return "L"
+  elif dir == "L":
+    return "U"
+
+def moverobot(pos, dir):
+  print("move:", pos)
+  if dir == "U":
+    pos[1] += 1
+  elif dir == "L":
+    pos[0] -= 1
+  elif dir == "D":
+    pos[1] -= 1
+  elif dir == "R":
+    pos[0] += 1
+  print("move->:", pos)
+  return pos
+
+for line in sys.stdin:
+    instructions = line.rstrip().split(',')
+
+    ints = []
+    grid = {0: {0: 0}}
+
+    if part2:
+      grid[0][0] = 1
+
+    currentdir = "U"
+    currentpos = [0,0]
+    seen = {}
+    minX = None
+    maxX = None
+    minY = None
+    maxY = None
+
+    for j in instructions:
+      ints.append(int(j))
+
+    robot = IntComp(ints,0)
+
+    while not robot.terminated():
+      #print("grid:", grid)
+      currentcolour = 0
+      if currentpos[0] in grid:
+        if currentpos[1] in grid[currentpos[0]]:
+          currentcolour = grid[currentpos[0]][currentpos[1]]
+          print(">>", currentcolour)
+
+      print("cc:", currentcolour, "pos:", currentpos, "dir:", currentdir)
+
+      colour = robot.perform([currentcolour])
+      if robot.terminated():
+        continue
+
+      # paint
+      if currentpos[0] in grid:
+        grid[currentpos[0]][currentpos[1]] = colour[0][0]
+      else:
+        t = {}
+        t[currentpos[1]] = colour[0][0]
+        grid[currentpos[0]] = t
+      xy = ("%d,%d" % (currentpos[0], currentpos[1]))
+      seen[xy] = 1
+
+      # turn
+      direction = robot.perform([])
+      if direction[0][0] == 0:
+        print("LEFT")
+        currentdir = turnleft(currentdir)
+      else:
+        print("RIGHT")
+        currentdir = turnright(currentdir)
+      print("nc1:", colour[0][0], "npos", currentpos, "dir:", currentdir)
+
+      # move
+      currentpos = moverobot(currentpos, currentdir)
+      print("nc2:", colour[0][0], "npos", currentpos, "dir:", currentdir)
+      print("==============")
+
+      if minX is None or currentpos[0] < minX:
+        minX = currentpos[0]
+      if minY is None or currentpos[1] < minY:
+        minY = currentpos[1]
+      if maxX is None or currentpos[0] > maxX:
+        maxX = currentpos[0]
+      if maxY is None or currentpos[1] > maxY:
+        maxY = currentpos[1]
+
+    if part2: 
+      for y in range(maxY, minY-1, -1):
+        row = ""
+        for x in range(minX, maxX+1):
+          currentcolour = 0
+          if x in grid:
+            if y in grid[x]:
+              currentcolour = grid[x][y]
+          if currentcolour == 1:
+            row = row + "#"
+          else:
+            row = row + " "
+        print(row)
+
+    else:
+      print(len(seen))
+