diff --git a/lib/arm/memory_instruction.rb b/lib/arm/memory_instruction.rb
index 84dfb6fd..318daaf2 100644
--- a/lib/arm/memory_instruction.rb
+++ b/lib/arm/memory_instruction.rb
@@ -6,8 +6,8 @@ module Arm
   class MemoryInstruction < Vm::MemoryInstruction
     include Arm::Constants
 
-    def initialize(first , attributes)
-      super(first , attributes)
+    def initialize(result , left , right = nil , attributes = {})
+      super(result , left , right , attributes)
       @attributes[:update_status] = 0 if @attributes[:update_status] == nil
       @attributes[:condition_code] = :al if @attributes[:condition_code] == nil
       @operand = 0
@@ -24,13 +24,13 @@ module Arm
                   
     # Build representation for target address
     def build
-      arg = @attributes[:right]
+      arg = @left
       arg = "r#{arg.register}".to_sym if( arg.is_a? Vm::Word )
       #str / ldr are _serious instructions. With BIG possibilities not half are implemented
       if (arg.is_a?(Symbol)) #symbol is register
         @rn = arg
-        if @attributes[:offset]
-          @operand = @attributes[:offset]
+        if @right
+          @operand = @right
           if (@operand < 0)
             @add_offset = 0
             #TODO test/check/understand
@@ -62,6 +62,7 @@ module Arm
 
     def assemble(io)
       build
+      puts inspect
       i = 0 #I flag (third bit)
       #not sure about these 2 constants. They produce the correct output for str r0 , r1
       # but i can't help thinking that that is because they are not used in that instruction and
@@ -77,7 +78,7 @@ module Arm
       val = reg_code(@operand) if @operand.is_a?(Symbol)
       val = shift(val , 0 ) # for the test
       @pre_post_index = 0 if @attributes[:flaggie]
-      val |= shift(reg_code(@first) ,        12 )  
+      val |= shift(reg_code(@result) ,        12 )  
       val |= shift(reg_code(@rn) ,        12+4) #16  
       val |= shift(@is_load ,        12+4  +4)
       val |= shift(w ,              12+4  +4+1)
diff --git a/lib/vm/instruction.rb b/lib/vm/instruction.rb
index 8890d1e8..019d88e9 100644
--- a/lib/vm/instruction.rb
+++ b/lib/vm/instruction.rb
@@ -49,8 +49,10 @@ module Vm
     end
   end
   class MemoryInstruction < Instruction
-    def initialize first , options = {}
-      @first = first
+    def initialize result , left , right = nil , options = {}
+      @result = result
+      @left = left
+      @right = right
       super(options)
     end
   end
diff --git a/lib/vm/register_machine.rb b/lib/vm/register_machine.rb
index 3bbdda87..b5dcb49e 100644
--- a/lib/vm/register_machine.rb
+++ b/lib/vm/register_machine.rb
@@ -57,7 +57,7 @@ module Vm
         define_instruction_two(inst , CompareInstruction)
       end
       [:strb, :str , :ldrb, :ldr].each do |inst|
-        define_instruction_one(inst , MemoryInstruction)
+        define_instruction_three(inst , MemoryInstruction)
       end
       [:b, :call , :swi].each do |inst|
         define_instruction_one(inst , CallInstruction)
@@ -126,7 +126,7 @@ module Vm
     # same for three args (result = left right,)
     def define_instruction_three(inst , clazz ,  defaults = {} )
       clazz =  self.class_for(clazz)
-      create_method(inst) do |result , left ,right , options = nil|
+      create_method(inst) do |result , left ,right = nil , options = nil|
         options = {} if options == nil
         options.merge defaults
         options[:opcode] = inst
diff --git a/test/arm/test_memory.rb b/test/arm/test_memory.rb
index c4f07253..41bf752c 100644
--- a/test/arm/test_memory.rb
+++ b/test/arm/test_memory.rb
@@ -4,30 +4,34 @@ class TestMemory < MiniTest::Test
   include ArmHelper
 
   def test_ldr
-    code = @machine.ldr  :r0, right: :r0
+    code = @machine.ldr  :r0, :r0
     assert_code code, :ldr ,  [0x00,0x00,0x90,0xe5] #e5 90 00 00
   end
-  def test_ldr2
-    code = @machine.ldr  :r0, right: :r0 , :offset =>  4
+  def test_ldr_const_offset
+    code = @machine.ldr  :r0, :r0 ,  4
     assert_code code, :ldr ,  [0x04,0x00,0x90,0xe5] #e5 90 00 04
   end
+  def test_ldr_reg_offset
+    code = @machine.ldr  :r0, :r1 , :r2
+    assert_code code, :ldr ,  [0x02,0x00,0x91,0xe6] #e6 91 00 02
+  end  
   def test_ldrb
-    code = @machine.ldrb  :r0, right: :r0
+    code = @machine.ldrb  :r0, :r0
     assert_code code, :ldrb ,  [0x00,0x00,0xd0,0xe5] #e5 d0 00 00
   end
 
   def test_str
-    code = @machine.str  :r0, right: :r1
+    code = @machine.str  :r0, :r1
     assert_code code, :str ,  [0x00,0x00,0x81,0xe5] #e5 81 00 00
   end
 
   def test_strb_add
-    code = @machine.strb  :r0, right: :r1 , :offset =>  1 , flaggie: 1
+    code = @machine.strb  :r0, :r1 , 1 , flaggie: 1
     assert_code code, :strb ,  [0x01,0x00,0xc1,0xe4] #e4 c1 00 01
   end
 
   def test_strb
-    code = @machine.strb  :r0, right: :r0
+    code = @machine.strb  :r0, :r0
     assert_code code, :strb ,  [0x00,0x00,0xc0,0xe5] #e5 c0 00 00
   end
 end