diff --git a/lib/parfait/binary_code.rb b/lib/parfait/binary_code.rb
index ea314f07..823daf00 100644
--- a/lib/parfait/binary_code.rb
+++ b/lib/parfait/binary_code.rb
@@ -25,8 +25,11 @@ module Parfait
     end
     def extend_one()
       @next = BinaryCode.new(1)
-      #puts "extending #{total_size - data_length} in #{self}"
-      Risc::Position.reset(self) if Risc::Position.set?(self)
+      if Risc::Position.set?(self)
+        Risc::Position.log.debug "extending #{total_size - data_length} in #{self}"
+        my_pos = Risc::Position.get(self)
+        Risc::Position.reset(my_pos , my_pos.at)
+      end
     end
 
     def each( &block )
diff --git a/lib/risc/interpreter.rb b/lib/risc/interpreter.rb
index 066869bd..00cf3b6c 100644
--- a/lib/risc/interpreter.rb
+++ b/lib/risc/interpreter.rb
@@ -14,7 +14,7 @@ module Risc
     # fire events for changed pc and register contents
     include Util::Eventable
     include Util::Logging
-    log_level :debug
+    log_level :info
 
     attr_reader :instruction , :clock , :pc  # current instruction and pc
     attr_reader :registers     # the registers, 16 (a hash, sym -> contents)
diff --git a/lib/risc/machine.rb b/lib/risc/machine.rb
index b709f26e..fa327278 100644
--- a/lib/risc/machine.rb
+++ b/lib/risc/machine.rb
@@ -74,7 +74,7 @@ module Risc
     def position_all
       raise "Not translated " unless @translated
       #need the initial jump at 0 and then functions
-      Position.set(cpu_init , 0 , cpu_init)
+      Position.set(cpu_init , 0 , nil)
       @code_start = position_objects( @platform.padding )
       # and then everything code
       position_code
@@ -131,7 +131,7 @@ module Risc
 
     def boot
       initialize
-      Position.positions.clear
+      Position.clear_positions
       @objects = nil
       @translated = false
       boot_parfait!
diff --git a/lib/risc/position.rb b/lib/risc/position.rb
index 30e6f8a1..567438be 100644
--- a/lib/risc/position.rb
+++ b/lib/risc/position.rb
@@ -16,21 +16,22 @@ module Risc
 
   module Position
     include Util::Logging
-    log_level :debug
+    log_level :info
 
     @positions = {}
+    @reverse_cache = {}
 
     def self.positions
       @positions
     end
 
+    def self.clear_positions
+      @positions = {}
+      @reverse_cache = {}
+    end
+    
     def self.at( int )
-      self.positions.each do |object , position|
-        next unless position.at == int
-        return position unless position.is_a?(InstructionPosition)
-        return position unless position.instruction.is_a?(Label)
-      end
-      nil
+      @reverse_cache[int]
     end
 
     def self.set?(object)
@@ -48,30 +49,40 @@ module Risc
       pos
     end
 
-    # set to the same position as before, thus triggering whatever code that propagates
-    # position _must have been set, otherwise raises
     def self.reset(obj)
       old = self.get(obj)
       old.reset_to( old.at )
     end
 
-    def self.set( object , pos , extra = nil)
-      # resetting of position used to be error, but since relink and dynamic instruction size it is ok.
-      # in measures
-      log.debug "Setting #{pos.to_s(16)} for #{object.class}-#{object}"
-      old = Position.positions[object]
-      testing = self.at( pos )
-      if old != nil
-        raise "Mismatch was:#{old}#{old.class} , should #{testing}#{testing.class}" if testing and testing.class != old.class
-        old.reset_to(pos)
-        log.debug "Reset #{pos.to_s(16)} for #{old.class}"
-        return old
+    # resetting of position used to be error, but since relink and dynamic instruction size it is ok.
+    # in measures
+    #
+    # reseting to the same position as before, triggers code that propagates
+    def self.reset(position , to)
+      log.debug "ReSetting #{position}, to:#{to.to_s(16)}, for #{position.object.class}-#{position.object}"
+      position.reset_to(to)
+      if testing = @reverse_cache[ to ]
+        if testing.class != position.class
+          raise "Mismatch (at #{to.to_s(16)}) new:#{position}:#{position.class} , was #{testing}:#{testing.class}"
+        end
+        @reverse_cache.delete(to)
       end
+      @reverse_cache[position.at] = position
+      log.debug "Reset #{position} (#{to.to_s(16)}) for #{position.class}"
+      return position
+    end
+
+    def self.set( object , pos , extra = nil)
+      old = Position.positions[object]
+      return self.reset(old , pos) if old
+      log.debug "Setting #{pos.to_s(16)} for #{object.class}-#{object}"
+      testing = self.at( pos )
       position = for_at( object , pos , extra)
-      raise "Mismatch was:#{position}#{position.class} , should #{testing}#{testing.class}" if testing and testing.class != old.class
+      raise "Mismatch (at #{pos.to_s(16)}) was:#{position} #{position.class} #{position.object} , should #{testing}#{testing.class}" if testing and testing.class != position.class
       self.positions[object] = position
       position.init(pos)
-      log.debug "Set #{pos.to_s(16)} for #{position.class}"
+      @reverse_cache[position.at] = position
+      log.debug "Set #{position} (#{pos.to_s(16)}) for #{position.class}"
       position
     end
 
diff --git a/lib/risc/position/code_position.rb b/lib/risc/position/code_position.rb
index c60e27a7..79ec9cde 100644
--- a/lib/risc/position/code_position.rb
+++ b/lib/risc/position/code_position.rb
@@ -31,9 +31,9 @@ module Risc
         end
       end
       def reset_to(pos)
-        super(pos)
-        Position.log.debug "Reset (#{pos.to_s(16)}) #{code}"
         init(pos)
+        super(pos)
+        Position.log.debug "ResetCode (#{pos.to_s(16)}) #{code}"
       end
       def next_method
         next_m = @method.next_method
diff --git a/lib/risc/position/instruction_position.rb b/lib/risc/position/instruction_position.rb
index 353e6c5f..c1508e80 100644
--- a/lib/risc/position/instruction_position.rb
+++ b/lib/risc/position/instruction_position.rb
@@ -17,28 +17,32 @@ module Risc
     class InstructionPosition < ObjectPosition
       attr_reader :instruction , :binary
       def initialize(instruction, pos , binary)
-        raise "not set " unless binary
+        raise "not set #{binary}" if pos != 0 and !binary.is_a?(Parfait::BinaryCode)
         super(instruction,pos)
         @instruction = instruction
         @binary = binary
       end
       def init(at)
-        diff = at - Position.get(@binary).at
-        if( diff % 60 == 13*4)
+        return if at == 0 and binary.nil?
+        return unless @instruction.next
+        nekst = at + @instruction.byte_length
+        diff = nekst - Position.get(@binary).at
+        Position.log.debug "Diff: #{diff.to_s(16)} , next #{nekst.to_s(16)} , binary #{Position.get(@binary)}"
+        raise "Invalid position #{diff.to_s(16)} , next #{nekst.to_s(16)} #{self}" if diff < 8
+        if( (diff % @binary.padded_length ) == 0 )
           @binary.extend_one unless @binary.next
           @binary = @binary.next
           raise "end of line " unless @binary
-          at = Position.get(@binary).at + Parfait::BinaryCode.offset
+          nekst = Position.get(@binary).at + Parfait::BinaryCode.offset
+          Position.log.debug "Jump to: #{nekst.to_s(16)}"
         end
-        return unless @instruction.next
-        at += @instruction.byte_length
-        Position.set(@instruction.next, at , @binary)
+        Position.set(@instruction.next, nekst , @binary)
       end
 
       def reset_to(pos)
-        super(pos)
-        Position.log.debug "Reset (#{pos}) #{instruction}"
         init(pos)
+        super(pos)
+        Position.log.debug "ResetInstruction (#{pos.to_s(16)}) #{instruction}"
       end
     end
   end
diff --git a/test/risc/position/test_instruction_position.rb b/test/risc/position/test_instruction_position.rb
index b803488f..4e6f4d68 100644
--- a/test/risc/position/test_instruction_position.rb
+++ b/test/risc/position/test_instruction_position.rb
@@ -23,15 +23,15 @@ module Risc
         second = Arm::ArmMachine.b( @label)
         @label.set_next(second)
         Position.set( @label , 8 , @binary)
-        Position.set(second , 2 , @binary)
+        Position.set(second , 12 , @binary)
         Position.set( @label , 8 , @binary)
         assert_equal 8 , Position.get(@label.next).at
       end
       def test_label_at
         branch = Branch.new("b" , @label)
-        Position.set(@label , 4 , @binary)
-        Position.set(branch , 4 , @binary)
-        at_4 = Position.at(4)
+        Position.set(@label , 8 , @binary)
+        Position.set(branch , 8 , @binary)
+        at_4 = Position.at(8)
         assert_equal InstructionPosition , at_4.class
         assert_equal Branch , at_4.instruction.class
       end
diff --git a/test/risc/test_machine.rb b/test/risc/test_machine.rb
index 6f5d951e..b62d1a7c 100644
--- a/test/risc/test_machine.rb
+++ b/test/risc/test_machine.rb
@@ -29,10 +29,10 @@ module Risc
       assert_equal 0 ,  Position.get(@machine.cpu_init).at
     end
     def test_cpu_at
-      assert_equal "0x5bd8" ,  Position.get(@machine.cpu_init.first).to_s
+      assert_equal "0x5714" ,  Position.get(@machine.cpu_init.first).to_s
     end
     def test_cpu_bin
-      assert_equal "0x5bcc" ,  Position.get(Position.get(@machine.cpu_init.first).binary).to_s
+      assert_equal "0x570c" ,  Position.get(Position.get(@machine.cpu_init.first).binary).to_s
     end
     def test_cpu_label
       assert_equal Position::InstructionPosition ,  Position.get(@machine.cpu_init.first).class