diff --git a/lib/mom/instruction/dynamic_call.rb b/lib/mom/instruction/dynamic_call.rb
index fc65b223..e15131ad 100644
--- a/lib/mom/instruction/dynamic_call.rb
+++ b/lib/mom/instruction/dynamic_call.rb
@@ -32,15 +32,14 @@ module Mom
     # a target (not a label)
     def to_risc(compiler)
       compiler.add_constant( @cache_entry )
-      reg = compiler.use_reg( :Object )
+      entry = compiler.use_reg( :CacheEntry )
       return_label = Risc.label(self, "continue_#{object_id}")
       save_return =  SlotLoad.new([:message,:next_message,:return_address],[return_label],self)
       moves = save_return.to_risc(compiler)
       moves << Risc.slot_to_reg(self, Risc.message_reg , :next_message , Risc.message_reg)
-      moves <<  Risc.load_constant( self , @cache_entry , reg )
-      method_index = Risc.resolve_to_index(:cache_entry , :cached_method)
-      moves << Risc::SlotToReg.new( self , reg ,method_index, reg)
-      moves << Risc::DynamicJump.new(self, reg )
+      moves <<  Risc.load_constant( self , @cache_entry , entry )
+      moves << Risc.slot_to_reg( self , entry ,:cached_method , entry)
+      moves << Risc::DynamicJump.new(self, entry )
       moves << return_label
     end
   end
diff --git a/lib/mom/instruction/return_sequence.rb b/lib/mom/instruction/return_sequence.rb
index d3ae8c6d..6538d17e 100644
--- a/lib/mom/instruction/return_sequence.rb
+++ b/lib/mom/instruction/return_sequence.rb
@@ -22,13 +22,12 @@ module Mom
     def to_risc(compiler)
       return_move = SlotLoad.new( [:message , :caller,:return_value] , [:message , :return_value],self)
       moves = return_move.to_risc(compiler)
-      return_address = compiler.use_reg(:Object)
       compiler.reset_regs
-      caller_index = Risc.resolve_to_index(:message , :caller)
-      return_index = Risc.resolve_to_index(:message , :return_address)
-      moves << Risc::SlotToReg.new(self, Risc.message_reg, return_index , return_address)
-      moves << Risc::SlotToReg.new( self , return_address , Parfait::Integer.integer_index , return_address)
-      moves << Risc::SlotToReg.new(self, Risc.message_reg , caller_index , Risc.message_reg)
+      return_address = compiler.use_reg(:ReturnAddress)
+      message = Risc.message_reg
+      moves << Risc.slot_to_reg(self,message, :return_address , return_address)
+      moves << Risc.slot_to_reg(self,return_address , Parfait::Integer.integer_index , return_address)
+      moves << Risc.slot_to_reg(self,message , :caller , message)
       moves << Risc::FunctionReturn.new(self, return_address)
     end
 
diff --git a/lib/mom/instruction/slot_definition.rb b/lib/mom/instruction/slot_definition.rb
index 4b097de8..322361e1 100644
--- a/lib/mom/instruction/slot_definition.rb
+++ b/lib/mom/instruction/slot_definition.rb
@@ -46,7 +46,13 @@ module Mom
       end
     end
     def to_register(compiler, source)
-      type = known_object.respond_to?(:ct_type) ? known_object.ct_type : :Object
+      if known_object.respond_to?(:ct_type)
+        type = known_object.ct_type
+      elsif(known_object.respond_to?(:get_type))
+        type = known_object.get_type
+      else
+        type = :Object
+      end
       right = compiler.use_reg( type )
       case known_object
       when Constant
@@ -57,8 +63,7 @@ module Mom
         const  = Risc.load_constant(source, known_object , right)
         if slots.length > 0
           # desctructively replace the existing value to be loaded if more slots
-          index = Risc.resolve_to_index(known_object , slots[0] ,compiler)
-          const << Risc::SlotToReg.new( source , right ,index, right)
+          const << Risc.slot_to_reg( source , right ,slots[0], right)
         end
       when Symbol
         return sym_to_risc(compiler , source)
diff --git a/lib/mom/instruction/slot_load.rb b/lib/mom/instruction/slot_load.rb
index c6ff2b5f..eda583bb 100644
--- a/lib/mom/instruction/slot_load.rb
+++ b/lib/mom/instruction/slot_load.rb
@@ -46,10 +46,9 @@ module Mom
       when Symbol
         sym_to_risc(compiler , const)
       when Parfait::CacheEntry
-        left = compiler.use_reg( :Object )
+        left = compiler.use_reg( :CacheEntry )
         const << Risc.load_constant(original_source, @left.known_object , left)
-        left_index = Risc.resolve_to_index(:cache_entry , left_slots.first)
-        const << Risc.reg_to_slot(original_source, const.register , left, left_index)
+        const << Risc.reg_to_slot(original_source, const.register , left, left_slots.first)
       else
         raise "We have left #{@left.known_object}"
       end
diff --git a/lib/parfait/cache_entry.rb b/lib/parfait/cache_entry.rb
index 72ed47c4..19c76bf8 100644
--- a/lib/parfait/cache_entry.rb
+++ b/lib/parfait/cache_entry.rb
@@ -7,12 +7,15 @@
 #
 module Parfait
   class CacheEntry < Object
+
     attr :cached_type
     attr :cached_method
+
     def initialize(type , method)
       @cached_type = type
       @cached_method = method
     end
+
     def to_s
       "CacheEntry" + "#{cached_method&.name}"
     end
diff --git a/lib/risc/builder.rb b/lib/risc/builder.rb
index 711882d6..697486ed 100644
--- a/lib/risc/builder.rb
+++ b/lib/risc/builder.rb
@@ -89,10 +89,10 @@ module Risc
       source += "add_new_int "
       space = compiler.use_reg(:Space)
       int = compiler.use_reg(:Integer)
-      space_i = Risc.resolve_to_index(:Space, :next_integer)
+      space_i = space.resolve_index(:next_integer)
       add_load_constant( source + "space" , Parfait.object_space , space  )
       add_slot_to_reg( source + "next_i1" , space , space_i , to)
-      add_slot_to_reg( source + "next_i2" , to , Risc.resolve_to_index(:Integer, :next_integer) , int)
+      add_slot_to_reg( source + "next_i2" , to , int.resolve_index(:next_integer) , int)
       add_reg_to_slot( source + "store link" , int , space , space_i  )
       add_reg_to_slot( source + "store value" , from , to , Parfait::Integer.integer_index)
     end
@@ -209,7 +209,7 @@ module Risc
   # variable name to an index.
   # The class can be mapped to a register, and so we get a memory address (reg+index)
   # Third arg, compiler, is only needed to resolve receiver/arguments/frame
-  def self.resolve_to_index(object , variable_name ,compiler = nil)
+  def self.old_resolve_to_index(object , variable_name , compiler)
     return variable_name if variable_name.is_a?(Integer) or variable_name.is_a?(RegisterValue)
     case object
     when :frame
diff --git a/lib/risc/instructions/reg_to_byte.rb b/lib/risc/instructions/reg_to_byte.rb
index e2ae0541..1ad2183f 100644
--- a/lib/risc/instructions/reg_to_byte.rb
+++ b/lib/risc/instructions/reg_to_byte.rb
@@ -12,9 +12,8 @@ module Risc
   # from and to are translated (from symbol to register if neccessary)
   # but index is left as is.
   def self.reg_to_byte( source , from , to , index)
-    from = resolve_to_register from
-    index = resolve_to_index( to , index)
-    to = resolve_to_register to
+    raise "Not register #{to}" unless RegisterValue.look_like_reg(to)
+    index = to.resolve_index(index) if index.is_a?(Symbol)
     RegToByte.new( source, from , to , index)
   end
 
diff --git a/test/parfait/type/test_basic.rb b/test/parfait/type/test_basic.rb
index 219faf38..93c96be5 100644
--- a/test/parfait/type/test_basic.rb
+++ b/test/parfait/type/test_basic.rb
@@ -56,14 +56,6 @@ module Parfait
       assert_equal 55 , @mess.receiver
     end
 
-    # not really parfait test, but related and no other place currently
-    def test_reg_index
-      message_ind = Risc.resolve_to_index( :message , :receiver )
-      assert_equal 2 , message_ind
-      @mess.set_receiver( 55)
-      assert_equal 55 , @mess.get_internal_word(message_ind)
-    end
-
     def test_variable_index
       assert_equal 1 , @type.variable_index(:next_message)
     end