diff --git a/README.markdown b/README.markdown
index d44da56..add9e6a 100644
--- a/README.markdown
+++ b/README.markdown
@@ -40,13 +40,16 @@ Documentation
 TODO
 ----
 
+### Demo game
+
 Finish the little demo "game" where you can move a block around the screen with
 the joystick (i.e. bring it up to par with the original demo game that was written
 for SixtyPical)
 
-### Operations on 16 bit values
+### Self-reference in signatures
 
-Compare word (constant or memory location) with memory location or pointer.  (Maybe?)
+A vector might store [the address of] a routine which changes the vector.  Thus its
+signature might look like `vector foo outputs foo`.  Thus we need to support that.
 
 ### `vector table` type
 
@@ -69,6 +72,7 @@ This should be tracked in the abstract interpretation.
 
 ### And at some point...
 
+*   Compare word (constant or memory location) with memory location or pointer.  (Maybe?)
 *   `copy x, [ptr] + y`
 *   Maybe even `copy [ptra] + y, [ptrb] + y`, which can be compiled to indirect LDA then indirect STA!
 *   Check that the buffer being read or written to through pointer, appears in approporiate inputs or outputs set.
diff --git a/doc/SixtyPical.md b/doc/SixtyPical.md
index 4c4cf0f..6db3da3 100644
--- a/doc/SixtyPical.md
+++ b/doc/SixtyPical.md
@@ -25,7 +25,8 @@ There are six *primitive types* in SixtyPical:
 
 There are also two *type constructors*:
 
-*   X table (256 entries, each holding a value of type X, where X is `byte`)
+*   T table (256 entries, each holding a value of type T, where T is either
+            `byte` or `word`)
 *   buffer[N] (N entries; each entry is a byte; N is a power of 2, ≤ 64K)
 
 Memory locations
diff --git a/eg/proto-game.60p b/eg/proto-game.60p
index 9015362..944562e 100644
--- a/eg/proto-game.60p
+++ b/eg/proto-game.60p
@@ -32,7 +32,7 @@ word delta
 
 vector dispatch_game_state
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
 
 //
@@ -49,13 +49,13 @@ vector dispatch_game_state
 
 vector cinv
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
   @ 788
 
 vector save_cinv
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
 
 
@@ -125,7 +125,7 @@ routine clear_screen
 
 routine game_state_play
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
 {
     call read_stick
@@ -145,15 +145,10 @@ routine game_state_play
 
 routine game_state_title_screen
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
 {
-    ld a, 5
-    st a, vic_border
-    ld a, 0
-    st a, vic_bg
     ld y, 0
-
     repeat {
         ld a, 82
         st a, screen1 + y
@@ -182,7 +177,7 @@ routine game_state_title_screen
 
 routine our_cinv
   inputs joy2, pos
-  outputs delta, pos, screen, vic_border, vic_bg, screen1
+  outputs delta, pos, screen, screen1
   trashes a, x, y, c, z, n, v, ptr
 {
     goto dispatch_game_state
@@ -194,8 +189,16 @@ routine main
           screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4
   trashes a, y, n, c, z, vic_border, vic_bg
 {
+    ld a, 5
+    st a, vic_border
+    ld a, 0
+    st a, vic_bg
+    ld y, 0
+
     call clear_screen
-    copy game_state_title_screen, dispatch_game_state
+
+    copy game_state_play, dispatch_game_state
+    // copy game_state_title_screen, dispatch_game_state
 
     copy word 0, pos
     with interrupts off {
diff --git a/loadngo.sh b/loadngo.sh
index b6e36d1..cb8955b 100755
--- a/loadngo.sh
+++ b/loadngo.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 SRC=$1
+if [ "X$1" = "X" ]; then
+    echo "Usage: ./loadngo.sh <source.60p>"
+    exit 1
+fi
 OUT=/tmp/a-out.prg
 bin/sixtypical --traceback --analyze --compile --basic-prelude $SRC > $OUT || exit 1
 if [ -e vicerc ]; then