diff --git a/eg/rudiments/add-pass.60p b/eg/rudiments/add-pass.60p
deleted file mode 100644
index 4427cbc..0000000
--- a/eg/rudiments/add-pass.60p
+++ /dev/null
@@ -1,8 +0,0 @@
-define main routine
-  inputs a
-  outputs a
-  trashes c, z, n, v
-{
-    st off, c
-    add a, 4
-}
diff --git a/eg/rudiments/add-word.60p b/eg/rudiments/add-word.60p
deleted file mode 100644
index a3c1d86..0000000
--- a/eg/rudiments/add-word.60p
+++ /dev/null
@@ -1,9 +0,0 @@
-word score
-define main routine
-  inputs score
-  outputs score
-  trashes a, c, z, v, n
-{
-    st off, c
-    add score, 1999
-}
diff --git a/eg/rudiments/add.60p b/eg/rudiments/add.60p
new file mode 100644
index 0000000..3c5a631
--- /dev/null
+++ b/eg/rudiments/add.60p
@@ -0,0 +1,36 @@
+// Include `support/${PLATFORM}.60p` before this source
+// Should print YY
+
+word score
+
+define main routine
+  inputs a, score
+  outputs score
+  trashes a, c, z, n, v
+{
+    ld a, 3
+    st off, c
+    add a, 4
+
+    cmp a, 7
+    if z {
+        ld a, 89
+        call chrout
+    } else {
+        ld a, 78
+        call chrout
+    }
+
+    copy 999, score
+    st off, c
+    add score, 1999
+
+    cmp score, 2998
+    if z {
+        ld a, 89
+        call chrout
+    } else {
+        ld a, 78
+        call chrout
+    }
+}
diff --git a/eg/rudiments/buffer.60p b/eg/rudiments/buffer.60p
index 79bc512..7772449 100644
--- a/eg/rudiments/buffer.60p
+++ b/eg/rudiments/buffer.60p
@@ -1,3 +1,6 @@
+// Include `support/${PLATFORM}.60p` before this source
+// Should print Y
+
 buffer[2048] buf
 pointer ptr @ 254
 byte foo
@@ -5,11 +8,23 @@
 define main routine
   inputs buf
   outputs buf, y, foo
-  trashes a, z, n, ptr
+  trashes a, z, n, c, ptr
 {
     ld y, 0
     copy ^buf, ptr
     copy 123, [ptr] + y
     copy [ptr] + y, foo
     copy foo, [ptr] + y
+
+    // TODO: support saying `cmp foo, 123`, maybe
+    ld a, foo
+    cmp a, 123
+
+    if z {
+        ld a, 89
+        call chrout
+    } else {
+        ld a, 78
+        call chrout
+    }
 }
diff --git a/eg/rudiments/copy.60p b/eg/rudiments/copy.60p
deleted file mode 100644
index d31fd6b..0000000
--- a/eg/rudiments/copy.60p
+++ /dev/null
@@ -1,10 +0,0 @@
-byte bar
-byte baz
-
-define main routine
-  inputs baz
-  outputs bar
-  trashes a, n, z
-{
-  copy baz, bar
-}
diff --git a/eg/rudiments/example.60p b/eg/rudiments/example.60p
index 9eefa8e..8b27de6 100644
--- a/eg/rudiments/example.60p
+++ b/eg/rudiments/example.60p
@@ -1,3 +1,6 @@
+// Include `support/${PLATFORM}.60p` before this source
+// Should print 01
+
 byte lives
 
 byte table[16] hexchars : "0123456789ABCDEF"
diff --git a/eg/rudiments/forever.60p b/eg/rudiments/forever.60p
index a9968cf..4d9bc92 100644
--- a/eg/rudiments/forever.60p
+++ b/eg/rudiments/forever.60p
@@ -1,3 +1,6 @@
+// This program is expected to loop forever.
+// Be prepared to forcibly terminate your emulator.
+
 define main routine
   trashes a, y, z, n, c
 {