most of the length and assembly stuff fixed

lib/register/instruction.rb

@@ -81,9 +81,19 @@ module Register
       raise "Abstract called on #{self}"
     end
 
+    def assemble_all io , labels = []
+      self.assemble(io)
+      self.next.assemble_all(io, labels) if self.next
+    end
+
+    def assemble io
+      raise "Abstract called on #{self}"
+    end
+
     def total_byte_length labels = []
       ret = self.byte_length
       ret += self.next.total_byte_length(labels) if self.next
+      #puts "#{self.class.name} return #{ret}"
       ret
     end