diff --git a/src/mame/drivers/alpha68k.cpp b/src/mame/drivers/alpha68k.cpp
index 1e1d2648c08..e8d1829d798 100644
--- a/src/mame/drivers/alpha68k.cpp
+++ b/src/mame/drivers/alpha68k.cpp
@@ -582,6 +582,17 @@ void alpha68k_state::sound_portmap(address_map &map)
 	PORT_DIPSETTING(    0x01, "A 2C/3C B 7C/1C" )   \
 	PORT_DIPSETTING(    0x00, "A 3C/2C B 8C/1C" )
 
+#define ALPHA68K_COINAGE_BITS_1TO3 \
+	PORT_DIPNAME( 0x0e, 0x0e, DEF_STR( Coinage ) )  PORT_DIPLOCATION("SW1:4,5,6") \
+	PORT_DIPSETTING(    0x0e, "A 1C/1C B 1C/1C" )   \
+	PORT_DIPSETTING(    0x06, "A 1C/2C B 2C/1C" )   \
+	PORT_DIPSETTING(    0x0a, "A 1C/3C B 3C/1C" )   \
+	PORT_DIPSETTING(    0x02, "A 1C/4C B 4C/1C" )   \
+	PORT_DIPSETTING(    0x0c, "A 1C/5C B 5C/1C" )   \
+	PORT_DIPSETTING(    0x04, "A 1C/6C B 6C/1C" )   \
+	PORT_DIPSETTING(    0x08, "A 2C/3C B 7C/1C" )   \
+	PORT_DIPSETTING(    0x00, "A 3C/2C B 8C/1C" )
+
 #define ALPHA68K_COINAGE_BITS_2TO4 \
 	PORT_DIPNAME( 0x1c, 0x1c, DEF_STR( Coinage ) )  PORT_DIPLOCATION("SW2:2,3,4") \
 	PORT_DIPSETTING(    0x1c, "A 1C/1C B 1C/1C" )   \
@@ -593,11 +604,6 @@ void alpha68k_state::sound_portmap(address_map &map)
 	PORT_DIPSETTING(    0x04, "A 2C/3C B 7C/1C" )   \
 	PORT_DIPSETTING(    0x00, "A 3C/2C B 8C/1C" )
 
-#define ALPHA68K_MCU \
-	PORT_START("IN2")  /* Coin input to microcontroller */\
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )\
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
-
 static INPUT_PORTS_START( timesold )
 	PORT_START("IN0")
 	ALPHA68K_PLAYER_INPUT_LSB( 1, IPT_UNKNOWN, IPT_START1, IP_ACTIVE_LOW )
diff --git a/src/mame/drivers/alpha68k_n.cpp b/src/mame/drivers/alpha68k_n.cpp
index 8f38ed9ad9e..bd54c0ba7f0 100644
--- a/src/mame/drivers/alpha68k_n.cpp
+++ b/src/mame/drivers/alpha68k_n.cpp
@@ -247,8 +247,7 @@ TIMER_CALLBACK_MEMBER(sstingray_state::alpha8511_sync)
 	if (BIT(m_alpha8511_control, 4))
 	{
 		m_alpha8511->set_input_line(MCS48_INPUT_IRQ, ASSERT_LINE);
-		if (m_alpha8511_read_mode)
-			m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
+		m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
 	}
 }
 
@@ -275,14 +274,14 @@ u8 sstingray_state::alpha8511_rw_r()
 void sstingray_state::alpha8511_control_w(u8 data)
 {
 	if (!BIT(data, 4))
+	{
 		m_alpha8511->set_input_line(MCS48_INPUT_IRQ, CLEAR_LINE);
+		m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
+	}
 	if (BIT(data, 5))
 		m_maincpu->set_input_line(M68K_IRQ_2, HOLD_LINE);
 	if (!BIT(data, 6))
-	{
 		m_shared_ram[m_alpha8511_address] = (m_shared_ram[m_alpha8511_address] & 0xff00) | m_microcontroller_data;
-		m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
-	}
 	flipscreen_w(!BIT(data, 7));
 
 	m_alpha8511_control = data;
@@ -561,7 +560,15 @@ static INPUT_PORTS_START( sstingry )
 	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Demo_Sounds ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x01, DEF_STR( On ) )
-	ALPHA68K_COINAGE_BITS_1TO3
+	PORT_DIPNAME( 0x0e, 0x00, DEF_STR( Coinage ) )
+	PORT_DIPSETTING(    0x00, "A 1C/1C B 1C/1C" )
+	PORT_DIPSETTING(    0x02, "A 1C/2C B 2C/1C" )
+	PORT_DIPSETTING(    0x04, "A 1C/3C B 3C/1C" )
+	PORT_DIPSETTING(    0x06, "A 1C/4C B 4C/1C" )
+	PORT_DIPSETTING(    0x08, "A 1C/5C B 5C/1C" )
+	PORT_DIPSETTING(    0x0a, "A 1C/6C B 6C/1C" )
+	PORT_DIPSETTING(    0x0c, "A 2C/3C B 7C/1C" )
+	PORT_DIPSETTING(    0x0e, "A 3C/2C B 8C/1C" )
 	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Lives ) )
 	PORT_DIPSETTING(    0x00, "3" )
 	PORT_DIPSETTING(    0x10, "4" )
@@ -586,7 +593,6 @@ static INPUT_PORTS_START( kyros )
 	PORT_DIPNAME( 0x01, 0x00, DEF_STR( Demo_Sounds ) )  PORT_DIPLOCATION("SW1:1")
 	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	//ALPHA68K_COINAGE_BITS_1TO3
 	PORT_DIPNAME( 0x0e, 0x0e, DEF_STR( Coinage ) )      PORT_DIPLOCATION("SW1:2,3,4")
 	PORT_DIPSETTING(    0x0e, "A 1C/1C B 1C/1C" )
 	PORT_DIPSETTING(    0x06, "A 1C/2C B 2C/1C" )
diff --git a/src/mame/includes/alpha68k.h b/src/mame/includes/alpha68k.h
index afb7877dc31..34c4fb3d4ce 100644
--- a/src/mame/includes/alpha68k.h
+++ b/src/mame/includes/alpha68k.h
@@ -344,16 +344,4 @@ enum
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )\
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
 
-// shared between skyadvnt and alpha68k_n.cpp
-#define ALPHA68K_COINAGE_BITS_1TO3 \
-	PORT_DIPNAME( 0x0e, 0x0e, DEF_STR( Coinage ) )  PORT_DIPLOCATION("SW1:4,5,6") \
-	PORT_DIPSETTING(    0x0e, "A 1C/1C B 1C/1C" )   \
-	PORT_DIPSETTING(    0x06, "A 1C/2C B 2C/1C" )   \
-	PORT_DIPSETTING(    0x0a, "A 1C/3C B 3C/1C" )   \
-	PORT_DIPSETTING(    0x02, "A 1C/4C B 4C/1C" )   \
-	PORT_DIPSETTING(    0x0c, "A 1C/5C B 5C/1C" )   \
-	PORT_DIPSETTING(    0x04, "A 1C/6C B 6C/1C" )   \
-	PORT_DIPSETTING(    0x08, "A 2C/3C B 7C/1C" )   \
-	PORT_DIPSETTING(    0x00, "A 3C/2C B 8C/1C" )
-
 #endif // MAME_INCLUDES_ALPHA68K_H