diff --git a/src/mame/namco/namcos23.cpp b/src/mame/namco/namcos23.cpp
index d14b5745f1c..e8a5a7db2df 100644
--- a/src/mame/namco/namcos23.cpp
+++ b/src/mame/namco/namcos23.cpp
@@ -3643,7 +3643,10 @@ static INPUT_PORTS_START( timecrs2 )
 	PORT_MODIFY("IN01")
 	PORT_BIT(0x0001, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Gun Trigger")
 	PORT_BIT(0x0002, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("Foot Pedal")
-	PORT_BIT(0x00fc, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_CONFNAME( 0x0004, 0x0004, "Link ID" )
+	PORT_CONFSETTING(      0x0000, "Right/Blue" )
+	PORT_CONFSETTING(      0x0004, "Left/Red" )
+	PORT_BIT(0x00f8, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT(0x0100, IP_ACTIVE_LOW, IPT_COIN1 )
 	PORT_BIT(0x0200, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT(0x0400, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // this is the "coin acceptor connected" signal