diff --git a/samples/hp48/index.html b/samples/hp48/index.html
index 6a5d1f4..ca49400 100644
--- a/samples/hp48/index.html
+++ b/samples/hp48/index.html
@@ -287,8 +287,11 @@
     }
 
     function getLineValue(line) {
-      if (line === 0 && calc.isEditing) {
-        return calc.inputValue;
+      if (calc.isEditing) {
+        if (line === 0) {
+          return calc.inputValue;
+        }
+        return calc.stack[line - 1];
       }
       return calc.stack[line];
     }
@@ -383,10 +386,7 @@
       try {
         if (event.key === 'Enter') {
           event.preventDefault();
-          if (calc.isEditing) {
-            calc.command('enter');
-          }
-          render();
+          execute('enter');
           return;
         }