diff --git a/TODO.md b/TODO.md
index e69de29..f73d875 100644
--- a/TODO.md
+++ b/TODO.md
@@ -0,0 +1,3 @@
+- more PIA: check out vice
+- Krusader: getting-started app doesn't work (think it's because don't 
+  have 32k of RAM: branch targets aren't being computed properly)
diff --git a/apple1.ino b/apple1.ino
index acd3567..16e1619 100644
--- a/apple1.ino
+++ b/apple1.ino
@@ -98,6 +98,9 @@ void loop() {
 				if (filename)
 					restore(io.tape, PROGRAMS, filename);
 				break;
+			case PS2_F8:
+				cpu.debug();
+				break;
 			default:
 				io.up(key);
 				break;