control keycode 57 = nul
alt keycode 57 = Meta_space
keycode 58 = Caps_Lock
+# Otto Wyss reports that his USB keyboard has keycode 84 where
+# a serial keyboard has keycode 43:
+#
+# keycode 84 = dollar sterling
+# control keycode 84 = Control_backslash
+# alt keycode 84 = Meta_backslash
keycode 97 = Control