diff --git a/lib/emits_bytes.rb b/lib/emits_bytes.rb
new file mode 100644
index 0000000..19582ee
--- /dev/null
+++ b/lib/emits_bytes.rb
@@ -0,0 +1,14 @@
+
+module Assembler6502
+
+  ####
+  ##  This is a base class for anything which can emit bytes
+  class EmitsBytes
+
+    def emit_bytes
+      fail(NotImplementedError, "#{self.class} must implement emit_bytes")
+    end
+
+  end
+
+end