diff --git a/.gitattributes b/.gitattributes
index afddd496e01..f8735ccebf6 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1814,6 +1814,8 @@ src/emu/machine/com8116.c svneol=native#text/plain
 src/emu/machine/com8116.h svneol=native#text/plain
 src/emu/machine/cr589.c svneol=native#text/plain
 src/emu/machine/cr589.h svneol=native#text/plain
+src/emu/machine/ds1204.c svneol=native#text/plain
+src/emu/machine/ds1204.h svneol=native#text/plain
 src/emu/machine/ds128x.c svneol=native#text/plain
 src/emu/machine/ds128x.h svneol=native#text/plain
 src/emu/machine/ds1302.c svneol=native#text/plain
diff --git a/src/emu/machine/ds1204.c b/src/emu/machine/ds1204.c
new file mode 100644
index 00000000000..2fef6bf8854
--- /dev/null
+++ b/src/emu/machine/ds1204.c
@@ -0,0 +1,367 @@
+// license:MAME
+// copyright-holders:smf
+/*
+ * ds1204.c
+ *
+ * Electronic Key
+ *
+ */
+
+#include <stdio.h>
+#include "emu.h"
+#include "ds1204.h"
+
+#define VERBOSE_LEVEL ( 0 )
+
+inline void ATTR_PRINTF( 3, 4 ) ds1204_device::verboselog( int n_level, const char *s_fmt, ... )
+{
+	if( VERBOSE_LEVEL >= n_level )
+	{
+		va_list v;
+		char buf[ 32768 ];
+		va_start( v, s_fmt );
+		vsprintf( buf, s_fmt, v );
+		va_end( v );
+		logerror( "%s: ds1204(%s) %s", machine().describe_context(), tag(), buf );
+	}
+}
+
+// device type definition
+const device_type DS1204 = &device_creator<ds1204_device>;
+
+ds1204_device::ds1204_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock )
+	: device_t( mconfig, DS1204, "DS1204", tag, owner, clock, "ds1204", __FILE__ ),
+	device_nvram_interface(mconfig, *this),
+	m_rst( 0 ),
+	m_clk( 0 ),
+	m_dqw( 0 )
+{
+}
+
+void ds1204_device::device_start()
+{
+	new_state( STATE_STOP );
+	m_dqr = DQ_HIGH_IMPEDANCE;
+
+	memset( m_command, 0, sizeof( m_command ) );
+	memset( m_compare_register, 0, sizeof( m_compare_register ) );
+
+	save_item( NAME( m_rst ) );
+	save_item( NAME( m_clk ) );
+	save_item( NAME( m_dqw ) );
+	save_item( NAME( m_dqr ) );
+	save_item( NAME( m_state ) );
+	save_item( NAME( m_bit ) );
+	save_item( NAME( m_command ) );
+	save_item( NAME( m_compare_register ) );
+	save_item( NAME( m_unique_pattern ) );
+	save_item( NAME( m_identification ) );
+	save_item( NAME( m_security_match ) );
+	save_item( NAME( m_secure_memory ) );
+}
+
+void ds1204_device::nvram_default()
+{
+	memset( m_unique_pattern, 0, sizeof( m_unique_pattern ) );
+	memset( m_identification, 0, sizeof( m_identification ) );
+	memset( m_security_match, 0, sizeof( m_security_match ) );
+	memset( m_secure_memory, 0, sizeof( m_secure_memory ) );
+
+	int expected_bytes = sizeof( m_unique_pattern ) + sizeof( m_identification ) + sizeof( m_security_match ) + sizeof( m_secure_memory );
+
+	if( !m_region )
+	{
+		logerror( "ds1204(%s) region not found\n", tag() );
+	}
+	else if( m_region->bytes() != expected_bytes )
+	{
+		logerror( "ds1204(%s) region length 0x%x expected 0x%x\n", tag(), m_region->bytes(), expected_bytes );
+	}
+	else
+	{
+		UINT8 *region = m_region->base();
+
+		memcpy( m_unique_pattern, region, sizeof( m_unique_pattern ) ); region += sizeof( m_unique_pattern );
+		memcpy( m_identification, region, sizeof( m_identification ) ); region += sizeof( m_identification );
+		memcpy( m_security_match, region, sizeof( m_security_match ) ); region += sizeof( m_security_match );
+		memcpy( m_secure_memory, region, sizeof( m_secure_memory ) ); region += sizeof( m_secure_memory );
+	}
+}
+
+void ds1204_device::nvram_read( emu_file &file )
+{
+	file.read( m_unique_pattern, sizeof( m_unique_pattern ) );
+	file.read( m_identification, sizeof( m_identification ) );
+	file.read( m_security_match, sizeof( m_security_match ) );
+	file.read( m_secure_memory, sizeof( m_secure_memory ) );
+}
+
+void ds1204_device::nvram_write( emu_file &file )
+{
+	file.write( m_unique_pattern, sizeof( m_unique_pattern ) );
+	file.write( m_identification, sizeof( m_identification ) );
+	file.write( m_security_match, sizeof( m_security_match ) );
+	file.write( m_secure_memory, sizeof( m_secure_memory ) );
+}
+
+void ds1204_device::new_state( int state )
+{
+	m_state = state;
+	m_bit = 0;
+}
+
+void ds1204_device::writebit( UINT8 *buffer )
+{
+	if( m_clk )
+	{
+		int index = m_bit / 8;
+		int mask = 1 << ( m_bit % 8 );
+
+		if( m_dqw )
+		{
+			buffer[ index ] |= mask;
+		}
+		else
+		{
+			buffer[ index ] &= ~mask;
+		}
+
+		m_bit++;
+	}
+}
+
+void ds1204_device::readbit( UINT8 *buffer )
+{
+	if( !m_clk )
+	{
+		int index = m_bit / 8;
+		int mask = 1 << ( m_bit % 8 );
+
+		if( buffer[ index ] & mask )
+		{
+			m_dqr = 1;
+		}
+		else
+		{
+			m_dqr = 0;
+		}
+	}
+	else
+	{
+		m_bit++;
+	}
+}
+
+WRITE_LINE_MEMBER( ds1204_device::write_rst )
+{
+	if( m_rst != state )
+	{
+		m_rst = state;
+		verboselog( 2, "rst=%d\n", m_rst );
+
+		if( m_rst )
+		{
+			new_state( STATE_PROTOCOL );
+		}
+		else
+		{
+			switch( m_state )
+			{
+			case STATE_WRITE_IDENTIFICATION:
+				verboselog( 0, "reset during write identification (bit=%d)\n", m_bit );
+				break;
+			case STATE_WRITE_SECURITY_MATCH:
+				verboselog( 0, "reset during write security match (bit=%d)\n", m_bit );
+				break;
+			case STATE_WRITE_SECURE_MEMORY:
+				verboselog( 0, "reset during write secure memory (bit=%d)\n", m_bit );
+				break;
+			}
+
+			new_state( STATE_STOP );
+			m_dqr = DQ_HIGH_IMPEDANCE;
+		}
+	}
+}
+
+WRITE_LINE_MEMBER( ds1204_device::write_clk )
+{
+	if( m_clk != state )
+	{
+		m_clk = state;
+		verboselog( 2, "clk=%d (bit=%d)\n", m_clk, m_bit );
+
+		if( m_clk )
+		{
+			m_dqr = DQ_HIGH_IMPEDANCE;
+		}
+
+		switch( m_state )
+		{
+		case STATE_PROTOCOL:
+			writebit( m_command );
+
+			if( m_bit == 24 )
+			{
+				verboselog( 1, "-> command %02x %02x %02x (%02x %02x)\n",
+					m_command[ 0 ], m_command[ 1 ], m_command[ 2 ], m_unique_pattern[ 0 ], m_unique_pattern[ 1 ] );
+
+				if( m_command[ 0 ] == COMMAND_READ && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
+				{
+					new_state( STATE_READ_IDENTIFICATION );
+				}
+				else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
+				{
+					new_state( STATE_READ_IDENTIFICATION );
+				}
+				else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_PROGRAM ) && m_command[ 2 ] == m_unique_pattern[ 1 ] )
+				{
+					new_state( STATE_WRITE_IDENTIFICATION );
+				}
+				else
+				{
+					new_state( STATE_STOP );
+				}
+			}
+			break;
+
+		case STATE_READ_IDENTIFICATION:
+			readbit( m_identification );
+
+			if( m_bit == 64 )
+			{
+				verboselog( 1, "<- identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
+					m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ],
+					m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] );
+
+				new_state( STATE_WRITE_COMPARE_REGISTER );
+			}
+			break;
+
+		case STATE_WRITE_COMPARE_REGISTER:
+			writebit( m_compare_register );
+
+			if( m_bit == 64 )
+			{
+				verboselog( 1, "-> compare register %02x %02x %02x %02x %02x %02x %02x %02x (%02x %02x %02x %02x %02x %02x %02x %02x)\n",
+					m_compare_register[ 0 ], m_compare_register[ 1 ], m_compare_register[ 2 ], m_compare_register[ 3 ],
+					m_compare_register[ 4 ], m_compare_register[ 5 ], m_compare_register[ 6 ], m_compare_register[ 7 ],
+					m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ],
+					m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] );
+
+				if( memcmp( m_compare_register, m_security_match, sizeof( m_compare_register ) ) == 0 )
+				{
+					if( m_command[ 0 ] == COMMAND_READ )
+					{
+						new_state( STATE_READ_SECURE_MEMORY );
+					}
+					else
+					{
+						new_state( STATE_WRITE_SECURE_MEMORY );
+					}
+				}
+				else
+				{
+					verboselog( 0, "compare register does not match\n" );
+					new_state( STATE_OUTPUT_GARBLED_DATA );
+				}
+			}
+			break;
+
+		case STATE_READ_SECURE_MEMORY:
+			readbit( m_secure_memory );
+
+			if( m_bit == 128 )
+			{
+				verboselog( 1, "<- secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+					m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ],
+					m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ],
+					m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ],
+					m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] );
+
+				new_state( STATE_STOP );
+			}
+			break;
+
+		case STATE_WRITE_SECURE_MEMORY:
+			writebit( m_secure_memory );
+
+			if( m_bit == 128 )
+			{
+				verboselog( 1, "-> secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+					m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ],
+					m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ],
+					m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ],
+					m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] );
+
+				new_state( STATE_STOP );
+			}
+			break;
+
+		case STATE_WRITE_IDENTIFICATION:
+			writebit( m_identification );
+
+			if( m_bit == 64 )
+			{
+				verboselog( 1, "-> identification %02x %02x %02x %02x %02x %02x %02x %02x\n",
+					m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ],
+					m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] );
+
+				new_state( STATE_WRITE_SECURITY_MATCH );
+			}
+			break;
+
+		case STATE_WRITE_SECURITY_MATCH:
+			writebit( m_security_match );
+
+			if( m_bit == 64 )
+			{
+				verboselog( 1, "<- security match %02x %02x %02x %02x %02x %02x %02x %02x\n",
+					m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ],
+					m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] );
+
+				new_state( STATE_STOP );
+			}
+			break;
+
+		case STATE_OUTPUT_GARBLED_DATA:
+			if( !m_clk && m_command[ 0 ] == COMMAND_READ )
+			{
+				m_dqr = machine().rand() & 1;
+				m_bit++;
+			}
+			else if( m_clk && m_command[ 0 ] == COMMAND_WRITE )
+			{
+				m_bit++;
+			}
+
+			if( m_bit == 64 )
+			{
+				new_state( STATE_STOP );
+			}
+			break;
+		}
+	}
+}
+
+WRITE_LINE_MEMBER( ds1204_device::write_dq )
+{
+	if( m_dqw != state )
+	{
+		m_dqw = state;
+
+		verboselog( 2, "dqw=%d\n", m_dqw );
+	}
+}
+
+READ_LINE_MEMBER( ds1204_device::read_dq )
+{
+	if( m_dqr == DQ_HIGH_IMPEDANCE )
+	{
+		verboselog( 2, "dqr=high impedance\n" );
+		return 0;
+	}
+
+	verboselog( 2, "dqr=%d (bit=%d)\n", m_dqr, m_bit );
+	return m_dqr;
+}
diff --git a/src/emu/machine/ds1204.h b/src/emu/machine/ds1204.h
new file mode 100644
index 00000000000..c37d866752c
--- /dev/null
+++ b/src/emu/machine/ds1204.h
@@ -0,0 +1,93 @@
+// license:MAME
+// copyright-holders:smf
+/*
+ * ds1204.h
+ *
+ * Electronic Key
+ *
+ */
+
+#pragma once
+
+#ifndef __DS1204_H__
+#define __DS1204_H__
+
+#include "emu.h"
+
+#define MCFG_DS1204_ADD( _tag ) \
+	MCFG_DEVICE_ADD( _tag, DS1204, 0 )
+
+class ds1204_device : public device_t,
+	public device_nvram_interface
+{
+public:
+	// construction/destruction
+	ds1204_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock );
+
+	DECLARE_WRITE_LINE_MEMBER( write_rst );
+	DECLARE_WRITE_LINE_MEMBER( write_clk );
+	DECLARE_WRITE_LINE_MEMBER( write_dq );
+	DECLARE_READ_LINE_MEMBER( read_dq );
+
+protected:
+	// device-level overrides
+	virtual void device_start();
+
+	// device_nvram_interface overrides
+	virtual void nvram_default();
+	virtual void nvram_read( emu_file &file );
+	virtual void nvram_write( emu_file &file );
+
+private:
+	inline void ATTR_PRINTF( 3, 4 ) verboselog( int n_level, const char *s_fmt, ... );
+	void new_state(int state);
+	void writebit(UINT8 *buffer);
+	void readbit(UINT8 *buffer);
+
+	enum state_t
+	{
+		STATE_STOP,
+		STATE_PROTOCOL,
+		STATE_READ_IDENTIFICATION,
+		STATE_WRITE_IDENTIFICATION,
+		STATE_WRITE_COMPARE_REGISTER,
+		STATE_WRITE_SECURITY_MATCH,
+		STATE_READ_SECURE_MEMORY,
+		STATE_WRITE_SECURE_MEMORY,
+		STATE_OUTPUT_GARBLED_DATA
+	};
+
+	enum command_t
+	{
+		COMMAND_READ = 0x62,
+		COMMAND_WRITE = 0x9d
+	};
+
+	enum cycle_t
+	{
+		CYCLE_NORMAL = 1,
+		CYCLE_PROGRAM = 2,
+		CYCLE_MASK = 3
+	};
+
+	static const int DQ_HIGH_IMPEDANCE = -1;
+
+	int m_rst;
+	int m_clk;
+	int m_dqw;
+	int m_dqr;
+	int m_state;
+	int m_bit;
+	UINT8 m_command[3];
+	UINT8 m_compare_register[8];
+	UINT8 m_unique_pattern[2];
+	UINT8 m_identification[8];
+	UINT8 m_security_match[8];
+	UINT8 m_secure_memory[16];
+};
+
+
+// device type definition
+extern const device_type DS1204;
+
+#endif
diff --git a/src/emu/machine/machine.mak b/src/emu/machine/machine.mak
index c46427ef85f..87df34fd6e6 100644
--- a/src/emu/machine/machine.mak
+++ b/src/emu/machine/machine.mak
@@ -381,6 +381,15 @@ ifneq ($(filter CR589,$(MACHINES)),)
 MACHINEOBJS += $(MACHINEOBJ)/cr589.o
 endif
 
+#-------------------------------------------------
+#
+#@src/emu/machine/ds1204.h,MACHINES += DS1204
+#-------------------------------------------------
+
+ifneq ($(filter DS1204,$(MACHINES)),)
+MACHINEOBJS += $(MACHINEOBJ)/ds1204.o
+endif
+
 #-------------------------------------------------
 #
 #@src/emu/machine/ds1302.h,MACHINES += DS1302
diff --git a/src/mame/drivers/meritm.c b/src/mame/drivers/meritm.c
index c801fbba758..237f7472be4 100644
--- a/src/mame/drivers/meritm.c
+++ b/src/mame/drivers/meritm.c
@@ -171,6 +171,7 @@ Not all regional versions are available for each Megatouch series
 #include "cpu/z80/z80daisy.h"
 #include "sound/ay8910.h"
 #include "video/v9938.h"
+#include "machine/ds1204.h"
 #include "machine/i8255.h"
 #include "machine/z80pio.h"
 #include "machine/ins8250.h"
@@ -178,18 +179,6 @@ Not all regional versions are available for each Megatouch series
 #include "machine/nvram.h"
 
 
-struct ds1204_t
-{
-	int state;
-	int read_ptr;
-	int last_clk;
-	UINT8 key[8];
-	UINT8 nvram[16];
-	int out_bit;
-	UINT8 command[3];
-
-};
-
 class meritm_state : public driver_device
 {
 public:
@@ -197,6 +186,7 @@ public:
 		: driver_device(mconfig, type, tag),
 			m_z80pio_0(*this, "z80pio_0"),
 			m_z80pio_1(*this, "z80pio_1"),
+			m_ds1204(*this, "ds1204"),
 			m_v9938_0(*this, "v9938_0"),
 			m_v9938_1(*this, "v9938_1"),
 			m_microtouch(*this, "microtouch") ,
@@ -214,7 +204,7 @@ public:
 	int m_bank;
 	int m_psd_a15;
 	UINT16 m_questions_loword_address;
-	ds1204_t m_ds1204;
+	required_device<ds1204_device> m_ds1204;
 	required_device<v9938_device> m_v9938_0;
 	required_device<v9938_device> m_v9938_1;
 	optional_device<microtouch_serial_device> m_microtouch;
@@ -236,21 +226,7 @@ public:
 	DECLARE_WRITE8_MEMBER(meritm_audio_pio_port_b_w);
 	DECLARE_WRITE8_MEMBER(meritm_io_pio_port_a_w);
 	DECLARE_WRITE8_MEMBER(meritm_io_pio_port_b_w);
-	DECLARE_DRIVER_INIT(pitbossm);
-	DECLARE_DRIVER_INIT(pitbossc);
-	DECLARE_DRIVER_INIT(pbss330);
-	DECLARE_DRIVER_INIT(pbst30);
-	DECLARE_DRIVER_INIT(pbst30b);
-	DECLARE_DRIVER_INIT(megat2);
-	DECLARE_DRIVER_INIT(megat3);
 	DECLARE_DRIVER_INIT(megat3te);
-	DECLARE_DRIVER_INIT(megat4);
-	DECLARE_DRIVER_INIT(megat4c);
-	DECLARE_DRIVER_INIT(megat4st);
-	DECLARE_DRIVER_INIT(megat4te);
-	DECLARE_DRIVER_INIT(megat5);
-	DECLARE_DRIVER_INIT(megat5t);
-	DECLARE_DRIVER_INIT(megat6);
 	virtual void machine_start();
 	virtual void video_start();
 	DECLARE_MACHINE_START(meritm_crt250_questions);
@@ -261,9 +237,6 @@ public:
 	TIMER_DEVICE_CALLBACK_MEMBER(meritm_interrupt);
 	TIMER_DEVICE_CALLBACK_MEMBER(vblank_start_tick);
 	TIMER_DEVICE_CALLBACK_MEMBER(vblank_end_tick);
-	void ds1204_w( ds1204_t *ds1204, int rst, int clk, int dq );
-	int ds1204_r(ds1204_t *ds1204);
-	void ds1204_init(const UINT8* key, const UINT8* nvram);
 	void meritm_crt250_switch_banks(  );
 	void meritm_switch_banks(  );
 	int meritm_touch_coord_transform(int *touch_x, int *touch_y);
@@ -279,118 +252,6 @@ public:
 
 
 
-/*************************************
- *
- *  DS1204 Electronic Key
- *
- *************************************/
-
-#define DS1204_STATE_IDLE           0
-#define DS1204_STATE_COMMAND            1
-#define DS1204_STATE_READ_KEY           2
-#define DS1204_STATE_WRITE_SECURITY_MATCH   3
-#define DS1204_STATE_READ_NVRAM         4
-
-void meritm_state::ds1204_w( ds1204_t *ds1204, int rst, int clk, int dq )
-{
-	//logerror("ds1204_w: rst = %d, clk = %d, dq = %d\n", rst, clk, dq );
-	if ( rst == 0 )
-	{
-		ds1204->state = DS1204_STATE_COMMAND;
-		ds1204->read_ptr = 0;
-	}
-	else
-	{
-		if ( (ds1204->last_clk == 1) && (clk == 0) )
-		{
-			switch(ds1204->state)
-			{
-				case DS1204_STATE_COMMAND:
-					//logerror("Command bit %d = %d\n", ds1204->read_ptr, dq);
-					if ( ds1204->read_ptr < 24 )
-					{
-						if ( dq == 1 )
-						{
-							ds1204->command[ds1204->read_ptr >> 3] |= (1 << (ds1204->read_ptr & 0x7));
-						}
-						else
-						{
-							ds1204->command[ds1204->read_ptr >> 3] &= ~(1 << (ds1204->read_ptr & 0x7));
-						}
-						ds1204->read_ptr++;
-					}
-					if ( ds1204->read_ptr == 24 )
-					{
-						ds1204->state = DS1204_STATE_READ_KEY;
-						ds1204->read_ptr = 0;
-					}
-					break;
-				case DS1204_STATE_READ_KEY:
-					//logerror("Key bit %d\n", ds1204->read_ptr);
-					if (ds1204->read_ptr < 64)
-					{
-						ds1204->out_bit = (ds1204->key[ds1204->read_ptr >> 3] >> (ds1204->read_ptr & 0x7)) & 0x01;
-						ds1204->read_ptr++;
-					}
-					if (ds1204->read_ptr == 64)
-					{
-						ds1204->state = DS1204_STATE_WRITE_SECURITY_MATCH;
-						ds1204->read_ptr = 0;
-					}
-					break;
-				case DS1204_STATE_WRITE_SECURITY_MATCH:
-					//logerror( "Security match bit %d = %d\n", ds1204->read_ptr, dq);
-					if (ds1204->read_ptr < 64)
-					{
-						ds1204->read_ptr++;
-					}
-					if (ds1204->read_ptr == 64)
-					{
-						ds1204->state = DS1204_STATE_READ_NVRAM;
-						ds1204->read_ptr = 0;
-					}
-					break;
-				case DS1204_STATE_READ_NVRAM:
-					//logerror( "Read nvram bit = %d\n", ds1204->read_ptr );
-					if (ds1204->read_ptr < 128)
-					{
-						ds1204->out_bit = (ds1204->nvram[ds1204->read_ptr >> 3] >> (ds1204->read_ptr & 0x7)) & 0x01;
-						ds1204->read_ptr++;
-					}
-					if (ds1204->read_ptr == 128)
-					{
-						ds1204->state = DS1204_STATE_IDLE;
-						ds1204->read_ptr = 0;
-					}
-					break;
-
-			}
-		}
-		ds1204->last_clk = clk;
-	}
-};
-
-int meritm_state::ds1204_r(ds1204_t *ds1204)
-{
-	//logerror("ds1204_r\n");
-	return ds1204->out_bit;
-};
-
-void meritm_state::ds1204_init(const UINT8* key, const UINT8* nvram)
-{
-	memset(&m_ds1204, 0, sizeof(m_ds1204));
-	if (key)
-		memcpy(m_ds1204.key, key, sizeof(m_ds1204.key));
-	if (nvram)
-		memcpy(m_ds1204.nvram, nvram, sizeof(m_ds1204.nvram));
-
-	state_save_register_item(machine(), "ds1204", NULL, 0, m_ds1204.state);
-	state_save_register_item(machine(), "ds1204", NULL, 0, m_ds1204.read_ptr);
-	state_save_register_item(machine(), "ds1204", NULL, 0, m_ds1204.last_clk);
-	state_save_register_item(machine(), "ds1204", NULL, 0, m_ds1204.out_bit);
-	state_save_register_item_array(machine(), "ds1204", NULL, 0, m_ds1204.command);
-};
-
 /*************************************
  *
  *  Microtouch <-> pc16550 interface
@@ -1044,7 +905,7 @@ READ8_MEMBER(meritm_state::meritm_audio_pio_port_b_r)
 
 	*/
 
-	return ds1204_r(&m_ds1204);
+	return m_ds1204->read_dq();
 };
 
 WRITE8_MEMBER(meritm_state::meritm_audio_pio_port_a_w)
@@ -1085,7 +946,9 @@ WRITE8_MEMBER(meritm_state::meritm_audio_pio_port_b_w)
 
 	*/
 
-	ds1204_w(&m_ds1204, (data & 0x4) >> 2, (data & 0x2) >> 1, data & 0x01);
+	m_ds1204->write_rst((data >> 2) & 1);
+	m_ds1204->write_clk((data >> 1) & 1);
+	m_ds1204->write_dq(data & 0x01);
 };
 
 WRITE8_MEMBER(meritm_state::meritm_io_pio_port_a_w)
@@ -1239,6 +1102,8 @@ static MACHINE_CONFIG_START( meritm_crt250, meritm_state )
 
 	MCFG_NVRAM_ADD_0FILL("nvram")
 
+	MCFG_DS1204_ADD("ds1204")
+
 	MCFG_VIDEO_ATTRIBUTES(VIDEO_UPDATE_BEFORE_VBLANK)
 
 	MCFG_V9938_ADD("v9938_0", "screen", 0x20000)
@@ -1387,6 +1252,9 @@ ROM_START( pitbosssc ) /* ROMs at U9 and U11 are localized for California, denot
 	ROM_LOAD( "9221-12_u14-0.u14", 0x50000, 0x10000, CRC(128b4dff) SHA1(945825d654b1dce2e71b4f8613029651c7641fac) )
 	ROM_LOAD( "9221-12_u15-0.u15", 0x60000, 0x10000, CRC(b5beeaa9) SHA1(99db48f83d09616617b585b60614f5819f5dc607) )
 	ROM_LOAD( "9221-12_u16-0.u16", 0x70000, 0x10000, CRC(574fb3c7) SHA1(213741df3055b97ddd9889c2aa3d3e863e2c86d3) ) // matches pitboss2
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "pitbosssc-key", 0x000000, 0x000022, BAD_DUMP CRC(77249fe0) SHA1(719f66742147cb8e5720250ce744e5eb4983ab82) )
 ROM_END
 
 ROM_START( pbss330 ) /* Dallas DS1204V security key attached to CRT-254 connected to J2 connector labeled 9233-01 U1-RO1 C1993 MII */
@@ -1399,6 +1267,8 @@ ROM_START( pbss330 ) /* Dallas DS1204V security key attached to CRT-254 connecte
 	ROM_LOAD( "9233-00-01_u14-r0", 0x50000, 0x10000, CRC(c6701f15) SHA1(d475c4490df8dfa6f2374bb70ef12c7afaecd501) )
 	ROM_LOAD( "9233-00-01_u15-r0", 0x60000, 0x10000, CRC(5810840e) SHA1(bad6457752ac212c3c11360a13a8d3473662a287) )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9233-01_u1-ro1_c1993_mii", 0x000000, 0x000022, BAD_DUMP CRC(93459659) SHA1(73ad4c3a7c52d3db3acb43662c535f8c2ed2376a) )
 
 	ROM_REGION( 0xc0000, "extra", 0 ) // question roms
 	ROM_LOAD( "qs9233-01_u7-r0",  0x00000, 0x40000, CRC(176dd688) SHA1(306cf78101219ef1122023a01d16dff5e9f2aecf) ) /* These 3 roms are on CRT-256 sattalite PCB */
@@ -1416,6 +1286,8 @@ ROM_START( pbst30 ) /* Dallas DS1204V security key attached to CRT-254 connected
 	ROM_LOAD( "9234-10-01_u14-r0", 0x50000, 0x10000, CRC(9b0873a4) SHA1(7362c6220aa4bf1a9ab7c11cb8a51587a2a0a992) )
 	ROM_LOAD( "9234-10-01_u15-r0", 0x60000, 0x10000, CRC(9fbd8582) SHA1(c0f68c8a7cdca34c8736cefc71767c421bcaba8a) )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9234-10_u1-ro1_c1994_mii", 0x000000, 0x000022, BAD_DUMP CRC(1c782f78) SHA1(8255afcffbe21a43f53cfb41867552681403ea47) )
 
 	ROM_REGION( 0xc0000, "extra", 0 ) // question roms
 	ROM_LOAD( "qs9234-01_u7-r0",  0x00000, 0x40000, CRC(c0534aaa) SHA1(4b3cbf03f29fd5b4b8fd423e73c0c8147692fa75) ) /* These 3 roms are on CRT-256 sattalite PCB */
@@ -1433,6 +1305,8 @@ ROM_START( pbst30b ) /* Dallas DS1204V security key attached to CRT-254 connecte
 	ROM_LOAD( "9234-00-01_u14-r0a", 0x50000, 0x10000, CRC(e83f91d5) SHA1(1d64c943787b239763f44be412ee7f5ad13eb37d) )
 	ROM_LOAD( "9234-00-01_u15-r0a", 0x60000, 0x10000, CRC(f10f0d39) SHA1(2b5d5a93adb5251e09160b10c067b6e70289f608) )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9234-01_u1-ro1_c1993_mii", 0x000000, 0x000022, BAD_DUMP CRC(74bf0546) SHA1(eb44a057cf797279ee3456a74e166fa711547ea4) )
 
 	ROM_REGION( 0xc0000, "extra", 0 ) // question roms
 	ROM_LOAD( "qs9234-01_u7-r0",  0x00000, 0x40000, CRC(c0534aaa) SHA1(4b3cbf03f29fd5b4b8fd423e73c0c8147692fa75) ) /* These 3 roms are on CRT-256 sattalite PCB */
@@ -1507,6 +1381,8 @@ ROM_START( pitbossm ) /* Dallas DS1204V security key attached to CRT-254 connect
 	ROM_LOAD( "9244-00-01_u15-r0", 0x60000, 0x10000, CRC(740e3734) SHA1(6440d258af114f3820683b4e6fba5db6aea02231) )
 	ROM_RELOAD(     0x70000, 0x10000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9244-00_u1-ro1_c1994_mii", 0x000000, 0x000022, BAD_DUMP CRC(0455e18b) SHA1(919b48c25888af0af34b2d0cf34370476a97b79e) )
 
 	ROM_REGION( 0xc0000, "extra", 0 ) // question roms
 	ROM_LOAD( "qs9243-00-01_u7-r0",  0x00000, 0x40000, CRC(35f4ca46) SHA1(87917b3017f505fae65d6bfa2c7d6fb503c2da6a) ) /* These 3 roms are on CRT-256 sattalite PCB */
@@ -1606,6 +1482,9 @@ ROM_START( megat2 ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-01_u38-r0g",    0x300000, 0x080000, CRC(6bc7f1ce) SHA1(ca26afe19966f37e95f8ca25e69bbdcc1e8624d7) ) /* Location U38, 02/10/1995 09:14:15 - Standard version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat2a ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
@@ -1618,6 +1497,9 @@ ROM_START( megat2a ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 *
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-01_u38-r0e",    0x300000, 0x080000, CRC(797fbbaf) SHA1(8d093374f109831e469133aaebc3f7c2a5ed0623) ) /* Location U38, 11/29/1994 10:51:00 - Standard version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat2b ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
@@ -1630,6 +1512,9 @@ ROM_START( megat2b ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 *
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-01_u38-r0d",    0x300000, 0x080000, CRC(f43de55f) SHA1(456b4098e22982d5f1c6f872684eefb473939747) ) /* Location U38, 941123 514 - Standard version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat2mn ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
@@ -1642,6 +1527,9 @@ ROM_START( megat2mn ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-02_u38-r0g",    0x300000, 0x080000, CRC(22f508be) SHA1(a34c9c1ae588ec8186f328119aa62600d05f192e) ) /* Location U38, 02/21/1995 16:46:14 - Minnesota version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat2ca ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
@@ -1654,6 +1542,9 @@ ROM_START( megat2ca ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-06_u38-r0g",    0x300000, 0x080000, CRC(51b8160a) SHA1(f2dd44ff3bd62c86c385b5e1438c560947f6c253) ) /* Location U38, 02/10/1995 10:03:52 - California version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat2caa ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0 */
@@ -1666,6 +1557,9 @@ ROM_START( megat2caa ) /* Dallas DS1204U-3 security key labeled 9255-10-01-U5-R0
 	ROM_RELOAD(                        0x280000, 0x080000)
 	ROM_LOAD( "9255-10-06_u38-r0e",    0x300000, 0x080000, CRC(b3c0e60a) SHA1(a633fec476f44ec7964329bd80257b9070043209) ) /* Location U38, 11/29/1994 11:23:00 - California version */
 	ROM_RELOAD(                        0x380000, 0x080000)
+
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-10-01-u5-r0", 0x000000, 0x000022, BAD_DUMP CRC(b13c68d2) SHA1(99f9584ba005d32ad8abefd64159a8c296dcd580) ) 
 ROM_END
 
 ROM_START( megat3 ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-RO1 C1995 MII */
@@ -1678,6 +1572,9 @@ ROM_START( megat3 ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-R
 	ROM_LOAD( "9255-20-01_u38-r0n", 0x300000, 0x080000, CRC(c3b1739d) SHA1(a12d4d4205e71cf306c7e4a7b03af017096e2492) ) /* Location U38, 02/20/1996 09:32:34 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1695,6 +1592,9 @@ ROM_START( megat3a ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-
 	ROM_LOAD( "9255-20-01_u38-r0k", 0x300000, 0x080000, CRC(3c7dfff5) SHA1(b1265d6541199a1327a87881457616c56cbb8779) ) /* Location U38, 02/09/1996 14:11:24 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1712,6 +1612,9 @@ ROM_START( megat3b ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-
 	ROM_LOAD( "9255-20-01_u38-r0f", 0x300000, 0x080000, CRC(85f48b91) SHA1(7a38644ac7ee55a254c037122af919fb268744a1) ) /* Location U38, 10/27/1995 14:23:00 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1729,6 +1632,9 @@ ROM_START( megat3c ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-
 	ROM_LOAD( "9255-20-01_u38-r0b", 0x300000, 0x080000, CRC(e2d7e2c5) SHA1(bf0be5f2142e5563eb3286f5b1a643943d685621) ) /* Location U38, 06/22/1995 15:30:06 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1746,6 +1652,9 @@ ROM_START( megat3d ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5-
 	ROM_LOAD( "9255-20-01_u38-r0a", 0x300000, 0x080000, CRC(1292c90e) SHA1(d6ca81396ae4f6c62a55ec688b3a36272b9c29fd) ) /* Location U38, 06/21/1995 09:31:31 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1763,6 +1672,9 @@ ROM_START( megat3ca ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5
 	ROM_LOAD( "9255-20-06_u38-r0n", 0x300000, 0x080000, CRC(f9ff003a) SHA1(6c32098593c444785de2deca0f8748042980d84d) ) /* Location U38, 02/20/1996 09:24:17 - California version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1780,6 +1692,9 @@ ROM_START( megat3caa ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U
 	ROM_LOAD( "9255-20-06_u38-r0d", 0x300000, 0x080000, CRC(c40b3a57) SHA1(7a13172b94188c5cba32622016a05eb904714a86) ) /* Location U38, 07/24/1995 12:05:34 - California version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1797,6 +1712,9 @@ ROM_START( megat3nj ) /* Dallas DS1204V security key at U5 labeled 9255-20-01 U5
 	ROM_LOAD( "9255-20-07_u38-r0g", 0x300000, 0x080000, CRC(0ac673e7) SHA1(6b014366fcc5cdaa3d6a7e40da580d14def80174) ) /* Location U38, 11/17/1995 09:43:15 - New Jersey version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-20-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(105fd1de) SHA1(da5e678b633df4d7eb5eac2647d7f1fbe04add7b) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1813,6 +1731,9 @@ ROM_START( megat3te ) /* Dallas DS1204V security key at U5 labeled 9255-30-01 U5
 	ROM_LOAD( "9255-30-01_u38-r0e", 0x300000, 0x080000, CRC(52ca7dd8) SHA1(9f44f158d67d7443405b87a18fc89d9c88be1dea) ) /* Location U38, 02/15/1996 16:04:36 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-30-01_u5-ro1_c1995_mii", 0x000000, 0x000022, BAD_DUMP CRC(562e83c8) SHA1(865c8f18711df5dac9c7301f67be5bfcc925cd3d) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1830,6 +1751,9 @@ ROM_START( megat4 ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-B
 	ROM_LOAD( "9255-40-01_u38-r0e", 0x300000, 0x80000,  CRC(407c5e57) SHA1(c7c907b3fd6a8e64dcc6c71288505980862effce) ) /* Location U38, 07/22/1996 14:52:24 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1847,6 +1771,9 @@ ROM_START( megat4a ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-
 	ROM_LOAD( "9255-40-01_u38-r0d", 0x300000, 0x80000,  CRC(0d098424) SHA1(ef2810ccd636e69378fd353c8a95605274bb227f) ) /* Location U38, 07/08/1996 14:16:56 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1864,6 +1791,9 @@ ROM_START( megat4b ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-
 	ROM_LOAD( "9255-40-01_u38-r0b", 0x300000, 0x80000,  CRC(0a16c846) SHA1(f0dcddb155f5e23a8dcf6bd8018cf6dc20c6bd34) ) /* Location U38, 05/03/1996 15:12 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1881,6 +1811,9 @@ ROM_START( megat4c ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-
 	ROM_LOAD( "9255-40-01_u38-r0a", 0x300000, 0x80000,  CRC(74188592) SHA1(aaa4cb5eb413e963c4ff3705904449e244b984ca) ) /* Location U38, 04/22/1996 14:31 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1898,6 +1831,9 @@ ROM_START( megat4d ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-
 	ROM_LOAD( "9255-40-01_u38-r0",  0x300000, 0x80000,  CRC(ec96813d) SHA1(f93bb08ae89ab5ec1c6b33d5b1040c50d3db9ef5) ) /* Location U38, 04/03/1996 14:01 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -1915,6 +1851,9 @@ ROM_START( megat4s ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5-
 	ROM_LOAD( "9255-41-01_u38-r0g", 0x300000, 0x80000,  CRC(9c0a515a) SHA1(01b9761a8ddf95e32498ac204844144d9dc32012) ) /* Location U38, 12/10/1996  17:08:08 - Standard version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943(__megat4s).u20",     0x000, 0x117, CRC(f31864ff) SHA1(ff44820379a350e7bd788ffb6926612b3483e114) )
 	ROM_LOAD( "sc3944-0a(__megat4s).u19",  0x000, 0x2dd, CRC(ad4fddaa) SHA1(10c1575dcaa5ca4af5dc630d84f43a9ed1cb3ace) )
@@ -1932,6 +1871,9 @@ ROM_START( megat4sa ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5
 	ROM_LOAD( "9255-41-01_u38-r0e", 0x300000, 0x80000,  CRC(69cbf865) SHA1(ce555b6ab70fa57f3f87a0028db563ceee4a416b) ) /* Location U38, 10/22/1996  11:05:04 - Standard version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943(__megat4s).u20",     0x000, 0x117, CRC(f31864ff) SHA1(ff44820379a350e7bd788ffb6926612b3483e114) )
 	ROM_LOAD( "sc3944-0a(__megat4s).u19",  0x000, 0x2dd, CRC(ad4fddaa) SHA1(10c1575dcaa5ca4af5dc630d84f43a9ed1cb3ace) )
@@ -1949,6 +1891,9 @@ ROM_START( megat4sb ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U5
 	ROM_LOAD( "9255-41-01_u38-r0c", 0x300000, 0x80000,  CRC(14b9fe96) SHA1(a324e1ef616b33ee4235f6bed04f6d4b0b537521) ) /* Location U38, 10/04/1996  09:39:04 - Standard version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943(__megat4s).u20",     0x000, 0x117, CRC(f31864ff) SHA1(ff44820379a350e7bd788ffb6926612b3483e114) )
 	ROM_LOAD( "sc3944-0a(__megat4s).u19",  0x000, 0x2dd, CRC(ad4fddaa) SHA1(10c1575dcaa5ca4af5dc630d84f43a9ed1cb3ace) )
@@ -1966,6 +1911,9 @@ ROM_START( megat4smn ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U
 	ROM_LOAD( "9255-41-02_u38-r0c", 0x300000, 0x80000,  CRC(0493168d) SHA1(99da5454902aa5dbc5939d4bef22af3e467e61d2) ) /* Location U38, 10/08/1996 09:56:42 - Minnesota version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-c-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1225Y nv ram
 	ROM_LOAD( "mt4smn_ds1225y.u31",  0x0000, 0x8000, CRC(3f47e8e9) SHA1(ecf2937ddf05206c68262bccb8cb4a6c2a4048e8) ) /* No actual label, so use a unique name for this set */
 
@@ -1986,6 +1934,9 @@ ROM_START( megat4snj ) /* Dallas DS1204V security key at U5 labeled 9255-40-01 U
 	ROM_LOAD( "9255-41-07_u38-r0g", 0x300000, 0x80000,  CRC(71eac4d4) SHA1(73b9ed876f0af94bbd88503921a2b4f26bcfd397) ) /* Location U38, 02/11/1997 11:59:41 - New Jersey version */
 	ROM_RELOAD(                     0x380000, 0x80000)
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-40-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(f1de113a) SHA1(0ddd963e24a5c36f11967c2653ec5991a6eaa1a4) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1225Y nv ram
 	ROM_LOAD( "mt4snj_ds1225y.u31",  0x0000, 0x8000, CRC(8d2a97e7) SHA1(7cb01d9499fed1674da6a04a11ed1cef0a39b3c0) ) /* No actual label, so use a unique name for this set */
 
@@ -2006,6 +1957,9 @@ ROM_START( megat4te ) /* Dallas DS1204V security key at U5 labeled 9255-50-01 U5
 	ROM_LOAD( "9255-50-01_u38-r0d", 0x300000, 0x080000, CRC(124d5b84) SHA1(3c2117f56d0dc406bfb508989729e36781e215a4) ) /* Location U38, 07/02/1996 14:41:59 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000 )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-50-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(9db02da4) SHA1(d4eec99e814dd6daa091f1ff2fb06bda314c5029) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt4te_ds1644.u31",  0x00000,  0x8000,   CRC(d9485491) SHA1(c602bf954fe8b06f81b0f5002246e8fa89237705) ) /* No actual label, so use a unique name for this set */
 
@@ -2026,6 +1980,9 @@ ROM_START( megat4tea ) /* Dallas DS1204V security key at U5 labeled 9255-50-01 U
 	ROM_LOAD( "9255-50-01_u38-r0a", 0x300000, 0x080000, CRC(abf187a5) SHA1(d4d2327b4564f3cafa2640499f8c6ae818ed04b8) ) /* Location U38, 06/06/1996 13:43:39 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000 )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-50-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(9db02da4) SHA1(d4eec99e814dd6daa091f1ff2fb06bda314c5029) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt4tea_ds1644.u31",  0x00000,  0x8000,   CRC(11e2c7ed) SHA1(99ee83410f7dbf5a259b11193829bb5c706d9fca) ) /* No actual label, so use a unique name for this set */
 
@@ -2046,6 +2003,9 @@ ROM_START( megat4st ) /* Dallas DS1204V security key at U5 labeled 9255-51-01 U5
 	ROM_LOAD( "9255-51-01_u38-r0b", 0x300000, 0x080000, CRC(181a83cb) SHA1(b8f92ae76ebba3849db76b084f0ab7d82256d81a) ) /* Location U38, 12/10/1996 16:59:23 - Standard Version */
 	ROM_RELOAD(                     0x380000, 0x080000 )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-51-01_u5-b-ro1_c1996_mii", 0x000000, 0x000022, BAD_DUMP CRC(14e4dfa8) SHA1(6a6a2a49c6862bbba3bde766e8f000828b1b3998) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt4st_ds1644.u31",  0x00000,  0x8000,   CRC(c6226d91) SHA1(20c9fa7ad135ac229c6bdf85b901629a0ecb8a81) ) /* No actual label, so use a unique name for this set */
 
@@ -2066,6 +2026,9 @@ ROM_START( megat4stg ) /* Dallas DS1204V security key at U5 labeled 9255-51-50 U
 	ROM_LOAD( "9255-51-50_u38-r0a", 0x300000, 0x080000, CRC(f7c2914d) SHA1(5d05b8db5ca734f7b05c3e215c0ef5b917455537) ) /* Location U38, 11/18/1996 10:11:01 - Bi-Lingual GER/ENG Version */
 	ROM_RELOAD(                     0x380000, 0x080000 )
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-51-50_u5-b-ro1_c1996_mii", 0x000000, 0x000022, CRC(14e4dfa8) SHA1(6a6a2a49c6862bbba3bde766e8f000828b1b3998) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt4stg_ds1644.u31",  0x00000,  0x8000,   CRC(7f6f8e57) SHA1(d65f20ae19afc05b33d7605143b8362d6e955e89) ) /* No actual label, so use a unique name for this set */
 
@@ -2085,6 +2048,9 @@ ROM_START( megat5 ) /* Dallas DS1204V security key at U5 labeled 9255-60-01 U5-C
 	ROM_RELOAD(                     0x280000, 0x80000)
 	ROM_LOAD( "9255-60-01_u38-r0i", 0x300000, 0x100000, CRC(82a4471d) SHA1(e66ab64bb7047e248f9edbf99eb83c480895dc68) ) /* Location U38, 09/26/1997 12:09:52 - Standard Version */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-60-01_u5-c-ro1_c1998_mii", 0x000000, 0x000022, BAD_DUMP CRC(81f1c9b1) SHA1(e03ab8fae8225332edd353725039ad0cedcd9493) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -2102,6 +2068,9 @@ ROM_START( megat5a ) /* Dallas DS1204V security key at U5 labeled 9255-60-01 U5-
 	ROM_LOAD( "9255-60-01_u38-r0c", 0x300000, 0x100000, CRC(1091e7fd) SHA1(3c31c178eb7bea0d2c7e839dc3ec549463092296) ) /* Location U38, 07/10/1997 16:49:56 - Standard Version */
 	/* 9255-60-01_u38-r0c has been verified with 4 sets as correct. It's not working due to??? */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-60-01_u5-c-ro1_c1998_mii", 0x000000, 0x000022, BAD_DUMP CRC(81f1c9b1) SHA1(e03ab8fae8225332edd353725039ad0cedcd9493) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -2118,6 +2087,9 @@ ROM_START( megat5nj ) /* Dallas DS1204V security key at U5 labeled 9255-60-01 U5
 	ROM_RELOAD(                     0x280000, 0x80000)
 	ROM_LOAD( "9255-60-07_u38-r0n", 0x300000, 0x100000, CRC(c8163fe8) SHA1(94199b892ce9e5f543e10f3f59a9aeee4782923f) ) /* Location U38, 07/13/1998 15:19:55 - New Jersey version */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-60-01_u5-b-ro1_c1998_mii", 0x000000, 0x000022, BAD_DUMP CRC(81f1c9b1) SHA1(e03ab8fae8225332edd353725039ad0cedcd9493) )
+
 	ROM_REGION( 0x1000, "user2", 0 ) // PALs
 	ROM_LOAD( "sc3943.u20",     0x000, 0x117, CRC(5a72fe78) SHA1(4b1a36904eb7048518507fe14bdade5c2589dbd7) )
 	ROM_LOAD( "sc3944-0a.u19",  0x000, 0x2dd, CRC(4cc46c5e) SHA1(0bab970df1539ce905f43603ad13171b05449a01) )
@@ -2134,6 +2106,9 @@ ROM_START( megat5t ) /* Dallas DS1204V security key at U5 labeled 9255-70-01 U5-
 	ROM_RELOAD(                     0x280000, 0x80000)
 	ROM_LOAD( "9255-70-01_u38-r0c", 0x300000, 0x100000, CRC(e4d71764) SHA1(7c4e8b484dc744a93ce42e24f3b6d5bb2a7c09e4) ) /* Location U38, 09/30/1997 12:13:24 - Standard version */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-70-01_u5-ro_c1997_mii", 0x000000, 0x000022, BAD_DUMP CRC(1888e4f2) SHA1(045b94d6600345c10098cae321811717071c4902) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt5t_ds1644.u31",  0x00000,  0x8000,   CRC(d1b91acf) SHA1(5ae3449d83b35ba5b20f7ff60eba4359f29cb744) ) /* No actual label, so use a unique name for this set */
 
@@ -2153,6 +2128,9 @@ ROM_START( megat5tg ) /* Dallas DS1204V security key at U5 labeled 9255-70-50 U5
 	ROM_RELOAD(                     0x280000, 0x80000)
 	ROM_LOAD( "9255-70-50_u38-r0d", 0x300000, 0x100000, CRC(044d123f) SHA1(d73df1f97f6da03fdee2ca3fda3845ec262a0f9a) ) /* Location U38, 10/29/1997 10:19:08 - Bi-Lingual GER/ENG Version */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-70-50_u5-c-ro1_c1998_mii", 0x000000, 0x000022, BAD_DUMP CRC(1888e4f2) SHA1(045b94d6600345c10098cae321811717071c4902) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1644 nv ram
 	ROM_LOAD( "mt5tg_ds1644.u31",  0x00000,  0x8000,   CRC(a054bb32) SHA1(4efc19cb0a671dfe9249ce85d31f6bd633f2a237) ) /* No actual label, so use a unique name for this set */
 
@@ -2171,6 +2149,9 @@ ROM_START( megat6 ) /* Dallas DS1204V security key at U5 labeled 9255-80 U5-B-RO
 	ROM_LOAD( "qs9255-08_u37-r0",   0x200000, 0x100000, CRC(5ba01949) SHA1(1598949ea18d07bbc78af0ddd279a687173c1229) ) /* Location U37 */
 	ROM_LOAD( "9255-80-01_u38-r0a", 0x300000, 0x100000, CRC(3df6b840) SHA1(31ba1ac04eed3e76cdf637507dedcc5f7e22c919) ) /* Location U38, 08/07/1998 15:54:23 - Standard Version */
 
+	ROM_REGION( 0x000022, "ds1204", 0 )
+	ROM_LOAD( "9255-80_u5-b-ro1_c1998_mii", 0x000000, 0x000022, BAD_DUMP CRC(975099f5) SHA1(bdb870b5d3aa1139320b426f8669418cf85a513e) )
+
 	ROM_REGION( 0x8000, "nvram", 0 ) // DS1230 nv ram
 	ROM_LOAD( "ds1230y.u31",  0x00000, 0x8000, CRC(51b6da5c) SHA1(1d53af89d7867bb48b9d46feff6fc3b7e8e80ac8) )
 
@@ -2181,224 +2162,61 @@ ROM_START( megat6 ) /* Dallas DS1204V security key at U5 labeled 9255-80 U5-B-RO
 	ROM_LOAD( "sc3981-0a.u51",  0x000, 0x117, CRC(4fc750d0) SHA1(d09ff7a8c66aeb5c49e9fec84bd1521e3f5d8d0a) )
 ROM_END
 
-DRIVER_INIT_MEMBER(meritm_state,pitbossm)
-{
-	static const UINT8 pitbossm_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pitbossm_ds1204_nvram[16] =
-		{ 0x16, 0x90, 0xa0, 0x52, 0xd8, 0x6c, 0x12, 0xaf, 0x36, 0x22, 0x61, 0x35, 0x0d, 0x58, 0x0c, 0x00 };
-
-	ds1204_init(pitbossm_ds1204_key, pitbossm_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,pitbossc)
-{
-	static const UINT8 pitbossc_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pitbossc_ds1204_nvram[16] =
-			{ 0x00, 0x00, 0x00, 0x39, 0x32, 0x32, 0x31, 0x2d, 0x31, 0x32, 0x30, 0xf4, 0xa1, 0x52, 0x56, 0x20 };
-
-	ds1204_init(pitbossc_ds1204_key, pitbossc_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,pbss330)
-{
-	static const UINT8 pbss330_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pbss330_ds1204_nvram[16] =
-		{ 0x09, 0x2b, 0x6b, 0xf7, 0x83, 0xca, 0x8e, 0xdd, 0x1a, 0x7e, 0x76, 0x1a, 0x75, 0x5e, 0x77, 0x00 };
-
-	ds1204_init(pbss330_ds1204_key, pbss330_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,pbst30)
-{
-	static const UINT8 pbst30b_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pbst30b_ds1204_nvram[16] =
-		{ 0x3e, 0x9a, 0x3c, 0x3f, 0x1d, 0x51, 0x72, 0xc9, 0x28, 0x2c, 0x1d, 0x2d, 0x0e, 0x56, 0x41, 0x00 };
-
-	ds1204_init(pbst30b_ds1204_key, pbst30b_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,pbst30b)
-{
-	static const UINT8 pbst30b_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pbst30b_ds1204_nvram[16] =
-		{ 0xa9, 0xdb, 0x41, 0xf8, 0xe4, 0x42, 0x20, 0x6e, 0xde, 0xaf, 0x4f, 0x046, 0x3d, 0x55, 0x44, 0x00 };
-
-	ds1204_init(pbst30b_ds1204_key, pbst30b_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,megat2)
-{
-	static const UINT8 pitbosmt_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 pitbosmt_ds1204_nvram[16] =
-		{ 0x00, 0xfe, 0x03, 0x03, 0x08, 0x00, 0xa2, 0x03, 0x4b, 0x07, 0x00, 0xe6, 0x02, 0xd3, 0x05, 0x00 };
-
-	ds1204_init(pitbosmt_ds1204_key, pitbosmt_ds1204_nvram);
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,megat3)
-{
-	static const UINT8 megat3_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 megat3_ds1204_nvram[16] =
-		{ 0x51, 0xa1, 0xc0, 0x7c, 0x27, 0x6e, 0x51, 0xb9, 0xa5, 0xb2, 0x27, 0x0c, 0xb9, 0x88, 0x82, 0x2c };
-
-	ds1204_init(megat3_ds1204_key, megat3_ds1204_nvram);
-
-};
-
 DRIVER_INIT_MEMBER(meritm_state,megat3te)
 {
-	static const UINT8 megat3_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 megat3_ds1204_nvram[16] =
-		{ 0x99, 0x53, 0xfc, 0x29, 0x3a, 0x95, 0x8b, 0x58, 0xca, 0xca, 0x00, 0xc2, 0x30, 0x62, 0x0b, 0x96 };
-
-	ds1204_init(megat3_ds1204_key, megat3_ds1204_nvram);
-
 	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xfff8, 0xffff, read8_delegate(FUNC(meritm_state::meritm_ds1644_r), this), write8_delegate(FUNC(meritm_state::meritm_ds1644_w), this));
-
 };
 
-DRIVER_INIT_MEMBER(meritm_state,megat4)
-{
-	static const UINT8 megat4_ds1204_nvram[16] =
-		{ 0xe3, 0x08, 0x39, 0xd8, 0x4c, 0xbb, 0xc4, 0xf8, 0xf0, 0xe2, 0xd8, 0x77, 0xa8, 0x3d, 0x95, 0x02 };
-
-	ds1204_init(0, megat4_ds1204_nvram);
-}
-
-DRIVER_INIT_MEMBER(meritm_state,megat4c)
-{
-	static const UINT8 megat4c_ds1204_key[8] =
-		{ 0xf0, 0xaa, 0x0f, 0x0f, 0x55, 0x55, 0xff, 0xab };
-
-	static const UINT8 megat4_ds1204_nvram[16] =
-		{ 0xe3, 0x08, 0x39, 0xd8, 0x4c, 0xbb, 0xc4, 0xf8, 0xf0, 0xe2, 0xd8, 0x77, 0xa8, 0x3d, 0x95, 0x02 };
-
-	ds1204_init(megat4c_ds1204_key, megat4_ds1204_nvram);
-}
-
-DRIVER_INIT_MEMBER(meritm_state,megat4te)
-{
-	static const UINT8 megat4te_ds1204_nvram[16] =
-		{ 0x05, 0x21, 0x96, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00 };
-
-	ds1204_init(0, megat4te_ds1204_nvram);
-
-	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xfff8, 0xffff, read8_delegate(FUNC(meritm_state::meritm_ds1644_r), this), write8_delegate(FUNC(meritm_state::meritm_ds1644_w), this));
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,megat4st)
-{
-	static const UINT8 megat4te_ds1204_nvram[16] =
-		{ 0x11, 0x04, 0x96, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00 };
-
-	ds1204_init(0, megat4te_ds1204_nvram);
-
-	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xfff8, 0xffff, read8_delegate(FUNC(meritm_state::meritm_ds1644_r), this), write8_delegate(FUNC(meritm_state::meritm_ds1644_w), this));
-
-};
-
-DRIVER_INIT_MEMBER(meritm_state,megat5)
-{
-	static const UINT8 megat5_ds1204_nvram[16] =
-		{ 0x06, 0x23, 0x97, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00 };
-
-	ds1204_init(0, megat5_ds1204_nvram);
-
-}
-
-DRIVER_INIT_MEMBER(meritm_state,megat5t)
-{
-	static const UINT8 megat5_ds1204_nvram[16] =
-		{ 0x08, 0x22, 0x97, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00 };
-
-	ds1204_init(0, megat5_ds1204_nvram);
-
-	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xfff8, 0xffff, read8_delegate(FUNC(meritm_state::meritm_ds1644_r), this), write8_delegate(FUNC(meritm_state::meritm_ds1644_w), this));
-
-}
-
-DRIVER_INIT_MEMBER(meritm_state,megat6)
-{
-	static const UINT8 megat6_ds1204_nvram[16] =
-		{ 0x07, 0x15, 0x98, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00 };
-
-	ds1204_init(0, megat6_ds1204_nvram);
-
-}
-
 /* CRT 250 */
 GAME( 1988, dodgecty,  0,        meritm_crt250, dodgecty, driver_device, 0,        ROT0, "Merit", "Dodge City (9131-02)", GAME_IMPERFECT_GRAPHICS )
 GAME( 1988, pitboss2,  0,        meritm_crt250, pitboss2, driver_device, 0,        ROT0, "Merit", "Pit Boss II (9221-01C)", GAME_IMPERFECT_GRAPHICS )
 GAME( 1988, spitboss,  0,        meritm_crt250, spitboss, driver_device, 0,        ROT0, "Merit", "Super Pit Boss (9221-02A)", GAME_IMPERFECT_GRAPHICS )
 GAME( 1990, pitbosss,  0,        meritm_crt250, pitbosss, driver_device, 0,        ROT0, "Merit", "Pit Boss Superstar (9221-10-00B)", GAME_IMPERFECT_GRAPHICS )
 GAME( 1990, pitbosssa, pitbosss, meritm_crt250, pitbosss, driver_device, 0,        ROT0, "Merit", "Pit Boss Superstar (9221-10-00A)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1992, pitbosssc, pitbosss, meritm_crt250, pitbosss, meritm_state,  pitbossc, ROT0, "Merit", "Pit Boss Superstar (9221-12-01)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1992, pitbosssc, pitbosss, meritm_crt250, pitbosss, driver_device, 0,        ROT0, "Merit", "Pit Boss Superstar (9221-12-01)", GAME_IMPERFECT_GRAPHICS )
 
 /* CRT 250 + CRT 252 + CRT 256 + CRT 258 */
-GAME( 1994, pbst30,    0,      meritm_crt250_crt252_crt258, pbst30, meritm_state,  pbst30,   ROT0, "Merit", "Pit Boss Supertouch 30 (9234-10-01)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1993, pbst30b,   pbst30, meritm_crt250_crt252_crt258, pbst30, meritm_state,  pbst30b,  ROT0, "Merit", "Pit Boss Supertouch 30 (9234-00-01)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, pbst30,    0,      meritm_crt250_crt252_crt258, pbst30, driver_device, 0,        ROT0, "Merit", "Pit Boss Supertouch 30 (9234-10-01)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1993, pbst30b,   pbst30, meritm_crt250_crt252_crt258, pbst30, driver_device, 0,        ROT0, "Merit", "Pit Boss Supertouch 30 (9234-00-01)", GAME_IMPERFECT_GRAPHICS )
 
 /* CRT 250 + CRT 254 + CRT 256 */
-GAME( 1993, pbss330,   0,        meritm_crt250_questions, pbss330,  meritm_state,  pbss330,  ROT0, "Merit", "Pit Boss Superstar III 30 (9233-00-01)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, pitbossm,  0,        meritm_crt250_questions, pitbossm, meritm_state,  pitbossm, ROT0, "Merit", "Pit Boss Megastar (9244-00-01)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1993, pbss330,   0,        meritm_crt250_questions, pbss330,  driver_device, 0,        ROT0, "Merit", "Pit Boss Superstar III 30 (9233-00-01)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, pitbossm,  0,        meritm_crt250_questions, pitbossm, driver_device, 0,        ROT0, "Merit", "Pit Boss Megastar (9244-00-01)", GAME_IMPERFECT_GRAPHICS )
 GAME( 1994, pitbossma, pitbossm, meritm_crt250_questions, pitbossa, driver_device, 0,        ROT0, "Merit", "Pit Boss Megastar (9243-00-01)", GAME_IMPERFECT_GRAPHICS )
 
 /* CRT 260 */
-GAME( 1994, megat2,    0,      meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROG, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, megat2a ,  megat2, meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, megat2b ,  megat2, meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, megat2mn,  megat2, meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-02 ROG, Minnesota version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, megat2ca,  megat2, meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-06 ROG, California version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1994, megat2caa, megat2, meritm_crt260, meritm_crt260, meritm_state, megat2,   ROT0, "Merit", "Pit Boss Megatouch II (9255-10-06 ROE, California version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat3,    0,      meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-01 RON, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3a,   megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-01 ROK, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3b,   megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-01 ROF, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3c,   megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3d,   megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat3ca,  megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-06 RON, California version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3caa, megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-06 ROD, California version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1995, megat3nj,  megat3, meritm_crt260, meritm_crt260, meritm_state, megat3,   ROT0, "Merit", "Megatouch III (9255-20-07 ROG, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat3te,  megat3, meritm_crt260, meritm_crt260, meritm_state, megat3te, ROT0, "Merit", "Megatouch III Tournament Edition (9255-30-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4,    0,      meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Megatouch IV (9255-40-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4a,   megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Megatouch IV (9255-40-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4b,   megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Megatouch IV (9255-40-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4c,   megat4, meritm_crt260, meritm_crt260, meritm_state, megat4c,  ROT0, "Merit", "Megatouch IV (9255-40-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4d,   megat4, meritm_crt260, meritm_crt260, meritm_state, megat4c,  ROT0, "Merit", "Megatouch IV (9255-40-01 RO, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4s,   megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROG, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4sa,  megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4sb,  megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4smn, megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Super Megatouch IV (9255-41-02 ROC, Minnesota version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4snj, megat4, meritm_crt260, meritm_crt260, meritm_state, megat4,   ROT0, "Merit", "Super Megatouch IV (9255-41-07 ROG, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4te,  megat4, meritm_crt260, meritm_crt260, meritm_state, megat4te, ROT0, "Merit", "Megatouch IV Tournament Edition (9255-50-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4tea, megat4, meritm_crt260, meritm_crt260, meritm_state, megat4te, ROT0, "Merit", "Megatouch IV Tournament Edition (9255-50-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4st,  megat4, meritm_crt260, meritm_crt260, meritm_state, megat4st, ROT0, "Merit", "Super Megatouch IV Tournament Edition (9255-51-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1996, megat4stg, megat4, meritm_crt260, meritm_crt260, meritm_state, megat4st, ROT0, "Merit", "Super Megatouch IV Turnier Version (9255-51-50 ROA, Bi-Lingual GER/ENG version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1997, megat5,    0,      meritm_crt260, meritm_crt260, meritm_state, megat5,   ROT0, "Merit", "Megatouch 5 (9255-60-01 ROI, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1997, megat5a,   megat5, meritm_crt260, meritm_crt260, meritm_state, megat5,   ROT0, "Merit", "Megatouch 5 (9255-60-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS|GAME_NOT_WORKING )
-GAME( 1998, megat5nj,  megat5, meritm_crt260, meritm_crt260, meritm_state, megat5,   ROT0, "Merit", "Megatouch 5 (9255-60-07 RON, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1998, megat5t,   megat5, meritm_crt260, meritm_crt260, meritm_state, megat5t,  ROT0, "Merit", "Megatouch 5 Tournament Edition (9255-70-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1998, megat5tg,  megat5, meritm_crt260, meritm_crt260, meritm_state, megat5t,  ROT0, "Merit", "Megatouch 5 Turnier Version (9255-70-50 ROD, Bi-Lingual GER/ENG version)", GAME_IMPERFECT_GRAPHICS )
-GAME( 1998, megat6,    0,      meritm_crt260, meritm_crt260, meritm_state, megat6,   ROT0, "Merit", "Megatouch 6 (9255-80-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2,    0,      meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROG, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2a ,  megat2, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2b ,  megat2, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2mn,  megat2, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-02 ROG, Minnesota version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2ca,  megat2, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-06 ROG, California version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1994, megat2caa, megat2, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Pit Boss Megatouch II (9255-10-06 ROE, California version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat3,    0,      meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-01 RON, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3a,   megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-01 ROK, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3b,   megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-01 ROF, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3c,   megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3d,   megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat3ca,  megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-06 RON, California version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3caa, megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-06 ROD, California version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1995, megat3nj,  megat3, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch III (9255-20-07 ROG, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat3te,  megat3, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Megatouch III Tournament Edition (9255-30-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4,    0,      meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch IV (9255-40-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4a,   megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch IV (9255-40-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4b,   megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch IV (9255-40-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4c,   megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch IV (9255-40-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4d,   megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch IV (9255-40-01 RO, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4s,   megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROG, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4sa,  megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROE, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4sb,  megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Super Megatouch IV (9255-41-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4smn, megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Super Megatouch IV (9255-41-02 ROC, Minnesota version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4snj, megat4, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Super Megatouch IV (9255-41-07 ROG, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4te,  megat4, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Megatouch IV Tournament Edition (9255-50-01 ROD, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4tea, megat4, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Megatouch IV Tournament Edition (9255-50-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4st,  megat4, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Super Megatouch IV Tournament Edition (9255-51-01 ROB, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1996, megat4stg, megat4, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Super Megatouch IV Turnier Version (9255-51-50 ROA, Bi-Lingual GER/ENG version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1997, megat5,    0,      meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch 5 (9255-60-01 ROI, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1997, megat5a,   megat5, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch 5 (9255-60-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS|GAME_NOT_WORKING )
+GAME( 1998, megat5nj,  megat5, meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch 5 (9255-60-07 RON, New Jersey version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1998, megat5t,   megat5, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Megatouch 5 Tournament Edition (9255-70-01 ROC, Standard version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1998, megat5tg,  megat5, meritm_crt260, meritm_crt260, meritm_state,  megat3te, ROT0, "Merit", "Megatouch 5 Turnier Version (9255-70-50 ROD, Bi-Lingual GER/ENG version)", GAME_IMPERFECT_GRAPHICS )
+GAME( 1998, megat6,    0,      meritm_crt260, meritm_crt260, driver_device, 0,        ROT0, "Merit", "Megatouch 6 (9255-80-01 ROA, Standard version)", GAME_IMPERFECT_GRAPHICS )
diff --git a/src/mame/mame.mak b/src/mame/mame.mak
index 0f37852395c..81dc120936d 100644
--- a/src/mame/mame.mak
+++ b/src/mame/mame.mak
@@ -364,6 +364,7 @@ MACHINES += CDP1871
 MACHINES += CDU76S
 MACHINES += COM8116
 MACHINES += CR589
+MACHINES += DS1204
 MACHINES += DS1302
 MACHINES += DS2401
 MACHINES += DS2404