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-rw-r--r--src/mame/drivers/cps1.cpp9
1 files changed, 7 insertions, 2 deletions
diff --git a/src/mame/drivers/cps1.cpp b/src/mame/drivers/cps1.cpp
index ca5a275c622..57a20308712 100644
--- a/src/mame/drivers/cps1.cpp
+++ b/src/mame/drivers/cps1.cpp
@@ -1521,10 +1521,15 @@ static INPUT_PORTS_START( unsquad )
PORT_DIPSETTING( 0x00, DEF_STR( Test ) )
INPUT_PORTS_END
-/* To enable other choices in the "test mode", you must press ("P1 Button 1" ('Ctrl')
- or "P1 Button 2" ('Alt')) when "Service Mode" is ON */
+/* To access the hidden pattern test modes, turn the "Service Mode" dip to ON, and hold down "P1 Button 1"
+ ('Ctrl') or "P1 Button 2" ('Alt') during the bootup test. Button 1 will load the Scroll (Background) test,
+ and Button 2 will load an Obj (Sprite) viewer. */
+
static INPUT_PORTS_START( ffight )
PORT_INCLUDE( cps1_3b )
+
+/* The button below is not officially documented, pressing it will allow you to escape from grabs and choke
+ holds instantly. */
PORT_MODIFY("IN1")
PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME ("P1 Button 3 (Cheat)")