diff --git a/src/mame/drivers/crystal.cpp b/src/mame/drivers/crystal.cpp
index ce45d31fe32..f6c94fa6b14 100644
--- a/src/mame/drivers/crystal.cpp
+++ b/src/mame/drivers/crystal.cpp
@@ -997,18 +997,19 @@ static INPUT_PORTS_START(officeye)
 	PORT_BIT( 0x00000008, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x00000010, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2) PORT_NAME("P2 Blue") // BLUE
 	PORT_BIT( 0x00000020, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	//PORT_BIT( 0x00000040, IP_ACTIVE_LOW, IPT_START2 ) // where is start2?
 	PORT_BIT( 0x00000040, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x00000080, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x0000ff00, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_BIT( 0x00010000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("P1 Red")  // RED
-	PORT_BIT( 0x00020000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x00020000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(3) PORT_NAME("P3 Red") 
 	PORT_BIT( 0x00040000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("P1 Green")  // GREEN
-	PORT_BIT( 0x00080000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x00080000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(3) PORT_NAME("P3 Green") 
 	PORT_BIT( 0x00100000, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("P1 Blue") // BLUE
-	PORT_BIT( 0x00200000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x00200000, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(3) PORT_NAME("P3 Blue") 
 	PORT_BIT( 0x00400000, IP_ACTIVE_LOW, IPT_START1 )
-	PORT_BIT( 0x00800000, IP_ACTIVE_LOW, IPT_START2 ) // where is start3?
+	PORT_BIT( 0x00800000, IP_ACTIVE_LOW, IPT_START3 )
 	PORT_BIT( 0xff000000, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_START("P3_P4")