diff --git a/README.mdown b/README.mdown
index 0076430..75bf769 100644
--- a/README.mdown
+++ b/README.mdown
@@ -12,9 +12,9 @@ It's meant to be used interactively via the Python REPL as well as programmatica
 
 An example of a Python REPL session:
 
-    >>> from dcpu_16 import CPU
+    >>> from dcpu_16 import CPU, spec_demo
     >>> c = CPU(debug=True)
-    >>> c.load_m()                  # loads demo program
+    >>> c.load_m(spec_demo)         # loads demo program
     >>> c.step()                    # step by one instruction
      << SET
      << c.r[0x0]
diff --git a/dcpu_16.py b/dcpu_16.py
index 98acddd..89a2189 100644
--- a/dcpu_16.py
+++ b/dcpu_16.py
@@ -364,7 +364,8 @@ class CPU(object):
     def j(c, val):
         c.r[7] = val
 
-
+    def _op(c, word):
+        """dispatch to op"""
 
     def _pointer(c, code):
         """get pointer to valcode"""
@@ -430,3 +431,9 @@ class CPU(object):
         pass
 
 
+spec_demo = [
+    0x7c01, 0x0030, 0x7de1, 0x1000, 0x0020, 0x7803, 0x1000, 0xc00d,
+    0x7dc1, 0x001a, 0xa861, 0x7c01, 0x2000, 0x2161, 0x2000, 0x8463,
+    0x806d, 0x7dc1, 0x000d, 0x9031, 0x7c10, 0x0018, 0x7dc1, 0x001a,
+    0x9037, 0x61c1, 0x7dc1, 0x001a, 0x0000, 0x0000, 0x0000, 0x0000,
+]