diff --git a/src/emu/sound/x1_010.c b/src/emu/sound/x1_010.c
index e0d0103667f..d0e57c69d81 100644
--- a/src/emu/sound/x1_010.c
+++ b/src/emu/sound/x1_010.c
@@ -89,12 +89,12 @@ x1_010_device::x1_010_device(const machine_config &mconfig, const char *tag, dev
 		m_stream(NULL),
 		m_region(NULL),
 		m_sound_enable(0),
-		//m_reg[0x2000],
-		//m_HI_WORD_BUF[0x2000],
-		//m_smp_offset[SETA_NUM_CHANNELS],
-		//m_env_offset[SETA_NUM_CHANNELS],
 		m_base_clock(0)
 {
+	memset(m_reg, 0, sizeof(m_reg));
+	memset(m_HI_WORD_BUF, 0, sizeof(m_HI_WORD_BUF));
+	memset(m_smp_offset, 0, sizeof(SETA_NUM_CHANNELS));
+	memset(m_env_offset, 0, sizeof(SETA_NUM_CHANNELS));
 }
 
 //-------------------------------------------------
diff --git a/src/mame/drivers/realbrk.c b/src/mame/drivers/realbrk.c
index 8d08f3effd9..42d4e288884 100644
--- a/src/mame/drivers/realbrk.c
+++ b/src/mame/drivers/realbrk.c
@@ -750,12 +750,18 @@ INTERRUPT_GEN_MEMBER(realbrk_state::realbrk_interrupt)
 	m_tmp68301->external_interrupt_1();
 }
 
-static TMP68301_INTERFACE( tmp68301_interface )
+static TMP68301_INTERFACE( tmp68301_default_interface )
 {
 	DEVCB_NULL,
 	DEVCB_DRIVER_MEMBER16(realbrk_state,realbrk_flipscreen_w)
 };
 
+static TMP68301_INTERFACE( tmp68301_pkgnsh_interface )
+{
+	DEVCB_NULL,
+	DEVCB_NULL
+};
+
 static MACHINE_CONFIG_START( realbrk, realbrk_state )
 
 	/* basic machine hardware */
@@ -763,7 +769,7 @@ static MACHINE_CONFIG_START( realbrk, realbrk_state )
 	MCFG_CPU_PROGRAM_MAP(realbrk_mem)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", realbrk_state,  realbrk_interrupt)
 
-	MCFG_TMP68301_ADD("tmp68301", tmp68301_interface)
+	MCFG_TMP68301_ADD("tmp68301", tmp68301_default_interface)
 
 	/* video hardware */
 	MCFG_SCREEN_ADD("screen", RASTER)
@@ -792,9 +798,11 @@ MACHINE_CONFIG_END
 static MACHINE_CONFIG_DERIVED( pkgnsh, realbrk )
 	MCFG_CPU_MODIFY("maincpu")
 	MCFG_CPU_PROGRAM_MAP(pkgnsh_mem)
+	
+	MCFG_TMP68301_MODIFY("tmp68301", tmp68301_pkgnsh_interface)
 MACHINE_CONFIG_END
 
-static MACHINE_CONFIG_DERIVED( pkgnshdx, realbrk )
+static MACHINE_CONFIG_DERIVED( pkgnshdx, pkgnsh )
 	MCFG_CPU_MODIFY("maincpu")
 	MCFG_CPU_PROGRAM_MAP(pkgnshdx_mem)
 MACHINE_CONFIG_END