From ea23fba274d6b33ebc092a34ef5a8262e4838bff Mon Sep 17 00:00:00 2001
From: Angelo Salese <angelosa@users.noreply.github.com>
Date: Sat, 8 Aug 2009 17:51:18 +0000
Subject: [PATCH] SNES: Make the unsupported reads on i/o open bus, fixes a
 layer enable in Super Kick Boxing

---
 src/mame/machine/snes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mame/machine/snes.c b/src/mame/machine/snes.c
index d1173aaa4b9..310ddaf9d93 100644
--- a/src/mame/machine/snes.c
+++ b/src/mame/machine/snes.c
@@ -587,8 +587,8 @@ READ8_HANDLER( snes_r_io )
 
 	}
 
-	/* Unsupported reads return 0xff */
-	return 0xff;
+	/* Unsupported reads returns open bus */
+	return snes_open_bus_r(space,0);
 }
 
 /*