diff --git a/src/mame/namco/20pacgal.cpp b/src/mame/namco/20pacgal.cpp
index 5c0e5a8f4e2..1c3a29e607c 100644
--- a/src/mame/namco/20pacgal.cpp
+++ b/src/mame/namco/20pacgal.cpp
@@ -309,16 +309,23 @@ static INPUT_PORTS_START( 20pacgal )
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START4 ) PORT_NAME( "Right 2 Players Start" )
 
 	PORT_START("SERVICE")
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
 	PORT_SERVICE_NO_TOGGLE( 0x80, IP_ACTIVE_LOW )
 
 	PORT_START( "EEPROMIN" )
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
 	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("eeprom", eeprom_serial_93cxx_device, do_read)   /* bit 7 is EEPROM data */
 
 	PORT_START( "EEPROMOUT" )
@@ -333,6 +340,7 @@ static INPUT_PORTS_START( 25pacman )
 	PORT_INCLUDE(20pacgal)
 
 	PORT_MODIFY("SERVICE")
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
@@ -345,12 +353,10 @@ static INPUT_PORTS_START( 25pacmano )
 	PORT_INCLUDE(20pacgal)
 
 	PORT_MODIFY("SERVICE")
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
+
+	PORT_MODIFY("EEPROMIN")
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
 INPUT_PORTS_END
 
 /*************************************