diff --git a/c64/kernal/ff80.kernal_revision.s b/c64/kernal/ff80.kernal_revision.s
index ff387fe3..0aad2a67 100644
--- a/c64/kernal/ff80.kernal_revision.s
+++ b/c64/kernal/ff80.kernal_revision.s
@@ -60,4 +60,4 @@
 //
 
 kernal_revision:
-    .byte $FF // XXX possibly change this value (current candidate: $F0), $FF conflicts with other machines
+    .byte $F0 // chosen not to conflict with anything known so far