diff --git a/eg/proto-game.60p b/eg/c64/demo-game.60p
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diff --git a/eg/intr1.60p b/eg/c64/intr1.60p
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diff --git a/eg/joystick.60p b/eg/c64/joystick.60p
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diff --git a/eg/screen1.60p b/eg/c64/screen1.60p
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diff --git a/eg/screen2.60p b/eg/c64/screen2.60p
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index eb45824..43df36d 100644
--- a/eg/screen2.60p
+++ b/eg/c64/screen2.60p
@@ -1,7 +1,7 @@
 // Displays 256 hearts at the top of the Commodore 64's screen.
 
 // Define where the screen starts in memory:
-byte table screen @ 1024
+byte table[256] screen @ 1024
 
 routine main
   // These are the values that will be written to by this routine:
diff --git a/eg/rudiments/README.md b/eg/rudiments/README.md
new file mode 100644
index 0000000..c561673
--- /dev/null
+++ b/eg/rudiments/README.md
@@ -0,0 +1,9 @@
+This directory contains example sources which demonstrate
+the rudiments of SixtyPical.
+
+Some are meant to fail and produce an error message.
+
+They are not meant to be specific to any architecture, but
+many do assume the existence of a routine at 65490 which
+outputs the value of the accumulator as an ASCII character,
+simply for the purposes of producing some observable output.
diff --git a/eg/add-fail.60p b/eg/rudiments/add-fail.60p
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diff --git a/eg/add-word.60p b/eg/rudiments/add-word.60p
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diff --git a/eg/bad-vector.60p b/eg/rudiments/bad-vector.60p
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diff --git a/eg/buffer.60p b/eg/rudiments/buffer.60p
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diff --git a/eg/call.60p b/eg/rudiments/call.60p
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diff --git a/eg/conditional.60p b/eg/rudiments/conditional.60p
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diff --git a/eg/copy.60p b/eg/rudiments/copy.60p
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diff --git a/eg/goto.60p b/eg/rudiments/goto.60p
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diff --git a/eg/loop.p60 b/eg/rudiments/loop.60p
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diff --git a/eg/memloc.p60 b/eg/rudiments/memloc.60p
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diff --git a/eg/new-style-routine.60p b/eg/rudiments/new-style-routine.60p
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diff --git a/eg/print.60p b/eg/rudiments/print.60p
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diff --git a/eg/rudiments/range-error.60p b/eg/rudiments/range-error.60p
new file mode 100644
index 0000000..32b61a1
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+++ b/eg/rudiments/range-error.60p
@@ -0,0 +1,9 @@
+byte table[8] message : "WHAT?"
+
+routine main
+  inputs message
+  outputs x, a, z, n
+{
+  ld x, 9
+  ld a, message + x
+}
diff --git a/eg/vector-table.60p b/eg/rudiments/vector-table.60p
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diff --git a/eg/vector.60p b/eg/rudiments/vector.60p
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diff --git a/eg/word-table.60p b/eg/rudiments/word-table.60p
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