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diff --git a/PolyAlu.hs b/PolyAlu.hs
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+++ b/PolyAlu.hs
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+{-# LINE 4 "PolyAlu.lhs" #-}
+{-#  LANGUAGE  TypeOperators, TypeFamilies, FlexibleContexts  #-}
+module Main where
+
+import CLasH.HardwareTypes
+import CLasH.Translator.Annotations
+import qualified Prelude as P
+{-# LINE 52 "PolyAlu.lhs" #-}
+type Op a         =   a -> a -> a
+type Opcode       =   Bit
+{-# LINE 60 "PolyAlu.lhs" #-}
+type RegBank s a    =   
+  Vector s a
+type RegState s a   =   
+  State (RegBank s a)
+{-# LINE 68 "PolyAlu.lhs" #-}
+type Word = SizedInt D12
+{-# LINE 88 "PolyAlu.lhs" #-}
+alu :: 
+  Op a -> Op a -> 
+  Opcode -> a -> a -> a
+alu op1 op2 Low    x y = op1 x y
+alu op1 op2 High   x y = op2 x y
+{-# LINE 110 "PolyAlu.lhs" #-}
+registers :: 
+  ((PositiveT s ,NaturalT (s :-: D1), (s :>: (s :-: D1)) ~ True )) => a -> RangedWord (s :-: D1) ->
+  RangedWord (s :-: D1) -> (RegState s a) -> (RegState s a, a )
+{-# LINE 118 "PolyAlu.lhs" #-}
+registers data_in rdaddr wraddr (State mem) = 
+  (State mem', data_out)
+  where
+    data_out  = mem!rdaddr
+    mem'      = replace mem wraddr data_in
+{-# LINE 138 "PolyAlu.lhs" #-}
+type Instruction = (Opcode, Word, RangedWord D8, RangedWord D8)
+{-# LINE 142 "PolyAlu.lhs" #-}
+{-# ANN cpu TopEntity#-}
+cpu :: 
+  Instruction -> RegState D9 Word -> (RegState D9 Word, Word)
+
+cpu (opc, d, rdaddr, wraddr) ram = (ram', alu_out)
+  where
+    alu_out         = alu (+) (-) opc d ram_out
+    (ram',ram_out)  = registers alu_out rdaddr wraddr ram
+{-# LINE 165 "PolyAlu.lhs" #-}
+{-# ANN initstate InitState#-}
+initstate :: RegState D9 Word
+initstate = State (copy (0 :: Word))  
+  
+{-# ANN program TestInput#-}
+program :: [Instruction]
+program =
+  [ (Low, 4, 0, 0) --  Write 4   to Reg0
+  , (Low, 3, 0, 1) --  Write 3+4 to Reg1
+  , (High,8, 1, 2) --  Write 8-7 to Reg2
+  ]
+
+run func state [] = []
+run func state (i:input) = o:out
+  where
+    (state', o) = func i state
+    out         = run func state' input
+    
+main :: IO ()
+main = do
+  let input = program
+  let istate = initstate
+  let output = run cpu istate input
+  mapM_ (\x -> putStr $ ("(" P.++ (show x) P.++ ")\n")) output
+  return ()