/* Data East Hardware
 'Simple' 156 based board  (PCB DE-0409-1)

 and Mitchell PCB MT5601-0 (slightly different component arrangement to Deco PCB)


  this is a 32-bit cpu connected to 16-bit hardware
  only ROM and System Work Ram is accessed via all 32 data lines
  we should throw away the MSB for other accesses

  Info from Charles MacDonald:

  - The sound effects 6295 is clocked at exactly half the rate of the
  music 6295.
  - Both have the SS pin pulled high to select the sample rate of the
  ADPCM data. Depends on the input clock though, the rates are described
  in the data sheet.
  - Both are connected directly to their ROMs with no swapping on the
  address or data lines. The music ROM is a 16-bit ROM in byte mode.

  The 156 data bus has pull-up resistors so reading unused locations will
  return $FFFF.

  I traced out all the connections and confirmed that both video chips (52
  and 141) really are on the lower 16 bits of the 32-bit data bus, same
  with the palette RAM. Just the program ROM and 4K internal RAM to the
  223 should be accessed as 32-bit. Not sure why that part isn't working
  right though.

  notes:

  Magical Drop / Magical Drop Plus / Chain Reaction

  Random crashes at 7mhz..

-- check this ---

I think the OKI M6295 clocks from Heavy Smash are correct at least for the
Mitchell games:


 - OKI M6295(1) clock: 1.000MHz (28 / 28), sample rate = 1000000 / 132
 - OKI M6295(2) clock: 2.000MHz (28 / 14), sample rate = 2000000 / 132


-- additional notes from Charles --

Each game has a 512K block of memory that is decoded in the same way.
One of the PALs controls where this block starts at, for example
0x380000 for Magical Drop and 0x180000 for Osman:

000000-00FFFF : Main RAM (16K)
010000-01FFFF : Sprite RAM (8K)
020000-02FFFF : Palette RAM (4K)
030000-03FFFF : simpl156_system_r / simpl156_eeprom_w
040000-04FFFF : PF1,2 control registers
050000-05FFFF : PF1,2 name tables
060000-06FFFF : PF1,2 row scroll
070000-07FFFF : Control register

The ordering of items within the block does not change and the size of
each region is always 64K. If any RAM or other I/O has to be mirrored,
it likely fills out the entire 64K range.

The control register (marked as MWA_NOP in the driver) pulls one of the
DE156 pins high for a brief moment and low again. Perhaps it triggers an
interrupt or reset? It doesn't seem to be connected to anything else, at
least on my board.

The sprite chip has 16K RAM but the highest address line is tied to
ground, so only 8K is available. This is correctly implemented in the
driver, I'm mentioning it to confirm it isn't banked or anything like that.



*/

extern void decrypt156(void);

#include "driver.h"
#include "decocrpt.h"
#include "deco32.h"
#include "cpu/arm/arm.h"
#include "machine/eeprom.h"
#include "vidhrdw/generic.h"
#include "machine/random.h"
#include "sound/okim6295.h"
#include "deco16ic.h"

static UINT32 *simpl156_systemram;
UINT8 *simpl156_default_eeprom;

extern VIDEO_START( simpl156 );
extern VIDEO_UPDATE( simpl156 );


INPUT_PORTS_START( simpl156 )
	PORT_START	/* 16bit */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_SERVICE1 )
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME( DEF_STR( Service_Mode )) PORT_CODE(KEYCODE_F2)
	PORT_BIT( 0x00f0, IP_ACTIVE_HIGH, IPT_VBLANK ) /* all bits? check.. */
	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_SPECIAL ) /* eeprom?.. */


	PORT_START	/* 16bit */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2)
	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_START2 )
INPUT_PORTS_END


READ32_HANDLER( simpl156_inputs_read )
{
	int eep = EEPROM_read_bit();
	UINT32 returndata;

	returndata = readinputport(0)^0xffff0000;

	returndata^= ( (eep<<8)  );
	return returndata;
}

READ32_HANDLER( simpl156_palette_r )
{
	return paletteram16[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_palette_w )
{
	int r,g,b;
	UINT16 dat;
	int color;

	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&paletteram16[offset]);
	color = offset;

	dat = paletteram16[offset]&0xffff;

	g = (dat >>  5) & 0x1f;
	r = (dat >>  0) & 0x1f;
	b = (dat >> 10) & 0x1f;

	g = (g << 3) | (g >> 2);
	r = (r << 3) | (r >> 2);
	b = (b << 3) | (b >> 2);

	palette_set_color(color,r,g,b);
}


static READ32_HANDLER(  simpl156_system_r )
{
	UINT32 returndata;

	returndata = readinputport(1);

	return returndata;
}

static WRITE32_HANDLER( simpl156_eeprom_w )
{
	int okibank;

	okibank = data & 0x07;

	OKIM6295_set_bank_base(1, 0x40000 * (data & 0x7) );

	EEPROM_set_clock_line((data & 0x20) ? ASSERT_LINE : CLEAR_LINE);
	EEPROM_write_bit(data & 0x10);
	EEPROM_set_cs_line((data & 0x40) ? CLEAR_LINE : ASSERT_LINE);
}




static READ32_HANDLER( oki_r )
{
	return OKIM6295_status_0_r(0);
}

static WRITE32_HANDLER( oki_w )
{
	OKIM6295_data_0_w(0, data & 0xff);
}

static READ32_HANDLER( oki2_r )
{
	return OKIM6295_status_1_r(0);
}

static WRITE32_HANDLER( oki2_w )
{
	OKIM6295_data_1_w(0, data & 0xff);
}

/* we need to throw away bits for all ram accesses as the devices are connected as 16-bit */

READ32_HANDLER( simpl156_spriteram_r )
{
	return spriteram32[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_spriteram_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&spriteram32[offset]);
}

static UINT32*simpl156_mainram;


READ32_HANDLER( simpl156_mainram_r )
{
	return simpl156_mainram[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_mainram_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&simpl156_mainram[offset]);
}

READ32_HANDLER( simpl156_pf1_rowscroll_r )
{
	return deco16_pf1_rowscroll[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_pf1_rowscroll_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&deco16_pf1_rowscroll[offset]);
}

READ32_HANDLER( simpl156_pf2_rowscroll_r )
{
	return deco16_pf2_rowscroll[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_pf2_rowscroll_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&deco16_pf2_rowscroll[offset]);
}

READ32_HANDLER ( simpl156_pf12_control_r )
{
	return deco16_pf12_control[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_pf12_control_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	COMBINE_DATA(&deco16_pf12_control[offset]);
}


READ32_HANDLER( simpl156_pf1_data_r )
{
	return deco16_pf1_data[offset]^0xffff0000;
}

WRITE32_HANDLER( simpl156_pf1_data_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;

	deco16_pf1_data_w(offset,data,mem_mask);
}

READ32_HANDLER( simpl156_pf2_data_r )
{
	return deco16_pf2_data[offset]^0xffff0000;
}


WRITE32_HANDLER( simpl156_pf2_data_w )
{
	data &=0x0000ffff;
	mem_mask &=0x0000ffff;
	deco16_pf2_data_w(offset,data,mem_mask);
}

/* Memory Map controled by PALs */

/* Chain Reaction */
static ADDRESS_MAP_START( chainrec_map, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x07ffff) AM_ROM /* rom (32-bit) */
	AM_RANGE(0x200000, 0x200003) AM_READ(simpl156_inputs_read)
	AM_RANGE(0x201000, 0x201fff) AM_RAM AM_BASE(&simpl156_systemram) /* work ram (32-bit) */
	AM_RANGE(0x3c0000, 0x3c0003) AM_READWRITE(oki2_r,oki2_w)
	AM_RANGE(0x400000, 0x407fff) AM_READWRITE(simpl156_mainram_r, simpl156_mainram_w) AM_BASE(&simpl156_mainram) /* main ram? */
	AM_RANGE(0x410000, 0x411fff) AM_READWRITE(simpl156_spriteram_r, simpl156_spriteram_w) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x420000, 0x420fff) AM_READWRITE(simpl156_palette_r,simpl156_palette_w)
	AM_RANGE(0x430000, 0x430003) AM_READWRITE(simpl156_system_r,simpl156_eeprom_w)
	AM_RANGE(0x440000, 0x44001f) AM_READWRITE(simpl156_pf12_control_r, simpl156_pf12_control_w)
	AM_RANGE(0x450000, 0x451fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x452000, 0x453fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x454000, 0x455fff) AM_READWRITE(simpl156_pf2_data_r, simpl156_pf2_data_w)
	AM_RANGE(0x460000, 0x461fff) AM_READWRITE(simpl156_pf1_rowscroll_r, simpl156_pf1_rowscroll_w)
	AM_RANGE(0x464000, 0x465fff) AM_READWRITE(simpl156_pf2_rowscroll_r, simpl156_pf2_rowscroll_w)
	AM_RANGE(0x470000, 0x470003) AM_RAM AM_WRITE(MWA32_NOP) /* ?? */
	AM_RANGE(0x480000, 0x480003) AM_READWRITE(oki_r,oki_w)
ADDRESS_MAP_END


/* Magical Drop */
static ADDRESS_MAP_START( magdrop_map, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x07ffff) AM_ROM
	AM_RANGE(0x200000, 0x200003) AM_READ(simpl156_inputs_read)
	AM_RANGE(0x201000, 0x201fff) AM_RAM AM_BASE(&simpl156_systemram) /* work ram (32-bit) */
	AM_RANGE(0x340000, 0x340003) AM_READWRITE(oki2_r,oki2_w)
	AM_RANGE(0x380000, 0x387fff) AM_READWRITE(simpl156_mainram_r, simpl156_mainram_w) AM_BASE(&simpl156_mainram) /* main ram? */
	AM_RANGE(0x390000, 0x391fff) AM_READWRITE(simpl156_spriteram_r, simpl156_spriteram_w) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x3a0000, 0x3a0fff) AM_READWRITE(simpl156_palette_r,simpl156_palette_w)
	AM_RANGE(0x3b0000, 0x3b0003) AM_READWRITE(simpl156_system_r,simpl156_eeprom_w)
	AM_RANGE(0x3c0000, 0x3c001f) AM_READWRITE(simpl156_pf12_control_r, simpl156_pf12_control_w)
	AM_RANGE(0x3d0000, 0x3d1fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x3d2000, 0x3d3fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x3d4000, 0x3d5fff) AM_READWRITE(simpl156_pf2_data_r, simpl156_pf2_data_w)
	AM_RANGE(0x3e0000, 0x3e1fff) AM_READWRITE(simpl156_pf1_rowscroll_r, simpl156_pf1_rowscroll_w)
	AM_RANGE(0x3e4000, 0x3e5fff) AM_READWRITE(simpl156_pf2_rowscroll_r, simpl156_pf2_rowscroll_w)
	AM_RANGE(0x3f0000, 0x3f0003) AM_RAM AM_WRITE(MWA32_NOP) /*? */
	AM_RANGE(0x400000, 0x400003) AM_READWRITE(oki_r,oki_w)
ADDRESS_MAP_END


static ADDRESS_MAP_START( magdropp_map, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x07ffff) AM_ROM
	AM_RANGE(0x200000, 0x200003) AM_READ(simpl156_inputs_read)
	AM_RANGE(0x201000, 0x201fff) AM_RAM AM_BASE(&simpl156_systemram) /* work ram (32-bit) */
	AM_RANGE(0x4c0000, 0x4c0003) AM_READWRITE(oki2_r,oki2_w)
	AM_RANGE(0x680000, 0x687fff) AM_READWRITE(simpl156_mainram_r, simpl156_mainram_w) AM_BASE(&simpl156_mainram) /* main ram? */
	AM_RANGE(0x690000, 0x691fff) AM_READWRITE(simpl156_spriteram_r, simpl156_spriteram_w) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x6a0000, 0x6a0fff) AM_READWRITE(simpl156_palette_r,simpl156_palette_w)
	AM_RANGE(0x6b0000, 0x6b0003) AM_READWRITE(simpl156_system_r,simpl156_eeprom_w)
	AM_RANGE(0x6c0000, 0x6c001f) AM_READWRITE(simpl156_pf12_control_r, simpl156_pf12_control_w)
	AM_RANGE(0x6d0000, 0x6d1fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x6d2000, 0x6d3fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x6d4000, 0x6d5fff) AM_READWRITE(simpl156_pf2_data_r, simpl156_pf2_data_w)
	AM_RANGE(0x6e0000, 0x6e1fff) AM_READWRITE(simpl156_pf1_rowscroll_r, simpl156_pf1_rowscroll_w)
	AM_RANGE(0x6e4000, 0x6e5fff) AM_READWRITE(simpl156_pf2_rowscroll_r, simpl156_pf2_rowscroll_w)
	AM_RANGE(0x6f0000, 0x6f0003) AM_RAM AM_WRITE(MWA32_NOP) /* ? */
	AM_RANGE(0x780000, 0x780003) AM_READWRITE(oki_r,oki_w)
ADDRESS_MAP_END

/* prtytime, charlien, osman */
static ADDRESS_MAP_START( mitchell156_map, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x07ffff) AM_ROM
	AM_RANGE(0x100000, 0x100003) AM_READWRITE(oki_r,oki_w)
	AM_RANGE(0x140000, 0x140003) AM_READWRITE(oki2_r,oki2_w)
	AM_RANGE(0x180000, 0x187fff) AM_READWRITE(simpl156_mainram_r, simpl156_mainram_w) AM_BASE(&simpl156_mainram) /* main ram */
	AM_RANGE(0x190000, 0x191fff) AM_READWRITE(simpl156_spriteram_r, simpl156_spriteram_w) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x1a0000, 0x1a0fff) AM_READWRITE(simpl156_palette_r,simpl156_palette_w)
	AM_RANGE(0x1b0000, 0x1b0003) AM_READWRITE(simpl156_system_r,simpl156_eeprom_w)
	AM_RANGE(0x1c0000, 0x1c001f) AM_READWRITE(simpl156_pf12_control_r, simpl156_pf12_control_w)
	AM_RANGE(0x1d0000, 0x1d1fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x1d2000, 0x1d3fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x1d4000, 0x1d5fff) AM_READWRITE(simpl156_pf2_data_r, simpl156_pf2_data_w)
	AM_RANGE(0x1e0000, 0x1e1fff) AM_READWRITE(simpl156_pf1_rowscroll_r, simpl156_pf1_rowscroll_w)
	AM_RANGE(0x1e4000, 0x1e5fff) AM_READWRITE(simpl156_pf2_rowscroll_r, simpl156_pf2_rowscroll_w)
	AM_RANGE(0x1f0000, 0x1f0003) AM_RAM AM_WRITE(MWA32_NOP) /* ? */
	AM_RANGE(0x200000, 0x200003) AM_READ(simpl156_inputs_read)
	AM_RANGE(0x201000, 0x201fff) AM_RAM AM_BASE(&simpl156_systemram) /* work ram (32-bit) */
ADDRESS_MAP_END

/* Joe and Mac Returns */
static ADDRESS_MAP_START( joemacr_map, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x07ffff) AM_ROM
	AM_RANGE(0x100000, 0x107fff) AM_READWRITE(simpl156_mainram_r, simpl156_mainram_w) AM_BASE(&simpl156_mainram) /* main ram */
	AM_RANGE(0x110000, 0x111fff) AM_READWRITE(simpl156_spriteram_r, simpl156_spriteram_w) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x120000, 0x120fff) AM_READWRITE(simpl156_palette_r,simpl156_palette_w)
	AM_RANGE(0x130000, 0x130003) AM_READWRITE(simpl156_system_r,simpl156_eeprom_w)
	AM_RANGE(0x140000, 0x14001f) AM_READWRITE(simpl156_pf12_control_r, simpl156_pf12_control_w)
	AM_RANGE(0x150000, 0x151fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x152000, 0x153fff) AM_READWRITE(simpl156_pf1_data_r, simpl156_pf1_data_w)
	AM_RANGE(0x154000, 0x155fff) AM_READWRITE(simpl156_pf2_data_r, simpl156_pf2_data_w)
	AM_RANGE(0x160000, 0x161fff) AM_READWRITE(simpl156_pf1_rowscroll_r, simpl156_pf1_rowscroll_w)
	AM_RANGE(0x164000, 0x165fff) AM_READWRITE(simpl156_pf2_rowscroll_r, simpl156_pf2_rowscroll_w)
	AM_RANGE(0x170000, 0x170003) AM_RAM AM_WRITE(MWA32_NOP) /* ? */
	AM_RANGE(0x180000, 0x180003) AM_READWRITE(oki_r,oki_w)
	AM_RANGE(0x1c0000, 0x1c0003) AM_READWRITE(oki2_r,oki2_w)
	AM_RANGE(0x200000, 0x200003) AM_READ(simpl156_inputs_read)
	AM_RANGE(0x201000, 0x201fff) AM_RAM AM_BASE(&simpl156_systemram) /* work ram (32-bit) */
ADDRESS_MAP_END


static gfx_layout tile_8x8_layout =
{
	8,8,
	RGN_FRAC(1,2),
	4,
	{ RGN_FRAC(1,2)+8,RGN_FRAC(1,2)+0,RGN_FRAC(0,2)+8,RGN_FRAC(0,2)+0 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16 },
	8*16
};

static gfx_layout tile_16x16_layout =
{
	16,16,
	RGN_FRAC(1,2),
	4,
	{ RGN_FRAC(1,2)+8,RGN_FRAC(1,2)+0,RGN_FRAC(0,2)+8,RGN_FRAC(0,2)+0 },
	{ 256,257,258,259,260,261,262,263,0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,8*16,9*16,10*16,11*16,12*16,13*16,14*16,15*16 },
	32*16
};

static gfx_layout spritelayout =
{
	16,16,
	RGN_FRAC(1,1),
	4,
	{ 24,8,16,0 },
	{ 512,513,514,515,516,517,518,519, 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
	  8*32, 9*32,10*32,11*32,12*32,13*32,14*32,15*32},
	32*32
};

static gfx_decode gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0, &tile_8x8_layout,     0,     32 },	/* Tiles (8x8) */
	{ REGION_GFX1, 0, &tile_16x16_layout,   0,     32 },	/* Tiles (16x16) */
	{ REGION_GFX2, 0, &spritelayout, 0x200, 32},	/* Sprites (16x16) */

	{ -1 } /* end of array */
};

NVRAM_HANDLER( simpl156 )
{
	if (read_or_write)
		EEPROM_save(file);
	else
	{
		EEPROM_init(&eeprom_interface_93C46);/* 93c45 */

		if (file) EEPROM_load(file);
		else
		{
			if (simpl156_default_eeprom)	/* Set the EEPROM to Factory Defaults */
				EEPROM_set_data(simpl156_default_eeprom,0x100);
		}
	}
}

static INTERRUPT_GEN( simpl156_vbl_interrupt )
{
	cpunum_set_input_line(0, ARM_IRQ_LINE, HOLD_LINE);
}


static MACHINE_DRIVER_START( chainrec )
	/* basic machine hardware */

	MDRV_CPU_ADD_TAG("DE156", ARM, 28000000 /* /4 */)	/*DE156*/ /* 7.000 MHz */ /* measured at 7.. seems to need 28? */
	MDRV_CPU_PROGRAM_MAP(chainrec_map,0)
	MDRV_CPU_VBLANK_INT(simpl156_vbl_interrupt,1)

	MDRV_FRAMES_PER_SECOND(58)
	MDRV_VBLANK_DURATION(800)
	MDRV_NVRAM_HANDLER(simpl156) /* 93C45 */

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_SIZE(64*8, 32*8)
	MDRV_VISIBLE_AREA(0*8, 40*8-1, 1*8, 31*8-1)
	MDRV_PALETTE_LENGTH(4096)
	MDRV_GFXDECODE(gfxdecodeinfo)
	MDRV_VIDEO_START(simpl156)
	MDRV_VIDEO_UPDATE(simpl156)

	MDRV_SPEAKER_STANDARD_STEREO("left", "right")


	MDRV_SOUND_ADD_TAG("OKIM6295_EFFECTS", OKIM6295, 32220000/32/132)
	MDRV_SOUND_CONFIG(okim6295_interface_region_1)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "left", 0.6)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "right", 0.6)

	MDRV_SOUND_ADD_TAG("OKIM6295_MUSIC", OKIM6295, 32220000/16/132)
	MDRV_SOUND_CONFIG(okim6295_interface_region_2)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "left", 0.2)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "right", 0.2)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( magdrop )
	/* basic machine hardware */
	MDRV_IMPORT_FROM(chainrec)
	MDRV_CPU_MODIFY("DE156")
	MDRV_CPU_PROGRAM_MAP(magdrop_map,0)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( magdropp )
	/* basic machine hardware */
	MDRV_IMPORT_FROM(chainrec)
	MDRV_CPU_MODIFY("DE156")
	MDRV_CPU_PROGRAM_MAP(magdropp_map,0)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( joemacr )
	/* basic machine hardware */
	MDRV_IMPORT_FROM(chainrec)
	MDRV_CPU_MODIFY("DE156")
	MDRV_CPU_PROGRAM_MAP(joemacr_map,0)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( mitchell156 )
	/* basic machine hardware */
	MDRV_IMPORT_FROM(chainrec)
	MDRV_CPU_MODIFY("DE156")
	MDRV_CPU_PROGRAM_MAP(mitchell156_map,0)

	MDRV_SOUND_REMOVE("OKIM6295_MUSIC")

	MDRV_SOUND_ADD_TAG("OKIM6295_MUSIC_SLOWER", OKIM6295, 32220000/32/132)
	MDRV_SOUND_CONFIG(okim6295_interface_region_2)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "left", 0.2)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "right", 0.2)
MACHINE_DRIVER_END


DRIVER_INIT(simpl156)
{
	UINT8 *rom = memory_region(REGION_SOUND2);
	int length = memory_region_length(REGION_SOUND2);
	UINT8 *buf1 = malloc(length);

	UINT32 x;

	/* hmm low address line goes to banking chip instead? */
	for (x=0;x<length;x++)
	{
		UINT32 addr;

		addr = BITSWAP24 (x,23,22,21,0, 20,
		                    19,18,17,16,
		                    15,14,13,12,
		                    11,10,9, 8,
		                    7, 6, 5, 4,
		                    3, 2, 1 );

		buf1[addr] = rom[x];
	}

	memcpy(rom,buf1,length);

	free (buf1);

	deco56_decrypt(REGION_GFX1);
	decrypt156();

	simpl156_default_eeprom = NULL;
}




/*
Osman
Mitchell Corp., 1996

This game runs on Data East hardware. The game is very
similar to Strider.

PCB Layout
----------

DEC-22VO
MT5601-0
------------------------------------------------------------
|                 MCF04.14H     MCF-03.14D     MCF-02.14A  |
|                                                          |
|     OKI M6295   SA01-0.13H            52     MCF-01.13A  |
|                                                          |
--|   OKI M6295                                            |
  |                                                        |
--|                               CY7C185-25   MCF-00.9A   |
|                                 CY7C185-25               |
|                                                          |
|                                                          |
|J                     GAL16V8           28.000MHz         |
|A                  CY7C185-25                             |
|M                  CY7C185-25     141                     |
|M                                                         |
|A          223                                            |
|                                             GAL16V8      |
|                                GAL16V8                   |
|                             CY7C185-25   223             |
--|                93C45.2H   CY7C185-25                   |
  |                                                  156   |
--| TESTSW                  SA00-0.1E                      |
|                                                          |
------------------------------------------------------------

*/

ROM_START( osman )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "sa00-0.1e",    0x000000, 0x080000, CRC(ec6b3257) SHA1(10a42a680ce122ab030eaa2ccd99d302cb77854e) )

	ROM_REGION( 0x200000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcf-00.9a",    0x000000, 0x080000, CRC(247712dc) SHA1(bcb765afd7e756b68131c97c30d210de115d6b50) )
	ROM_CONTINUE( 0x100000, 0x080000)
	ROM_CONTINUE( 0x080000, 0x080000)
	ROM_CONTINUE( 0x180000, 0x080000)

	ROM_REGION( 0x800000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcf-02.14a",    0x000001, 0x200000, CRC(21251b33) SHA1(d252fe5c6eef8cbc9327e4176b4868b1cb17a738) )
	ROM_LOAD16_BYTE( "mcf-04.14h",    0x000000, 0x200000, CRC(4fa55577) SHA1(e229ba9cce46b92ce255aa33b974e19b214c4017) )
	ROM_LOAD16_BYTE( "mcf-01.13a",    0x400001, 0x200000, CRC(83881e25) SHA1(ae82cf0f704e6efea94c6c1d276d4e3e5b3ebe43) )
	ROM_LOAD16_BYTE( "mcf-03.14d",    0x400000, 0x200000, CRC(faf1d51d) SHA1(675dbbfe15b8010d54b2b3af26d42cdd753c2ce2) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "sa01-0.13h",    0x00000, 0x40000,  CRC(cea8368e) SHA1(1fcc641381fdc29bd50d3a4b23e67647f79e505a))

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcf-05.12f",    0x00000, 0x200000, CRC(f007d376) SHA1(4ba20e5dabeacc3278b7f30c4462864cbe8f6984) )
ROM_END

/* NOTE: Cannon Dancer uses IDENTICAL roms to Osman
   Region is contained in the eeprom settings which we set in the INIT function */
ROM_START( candance )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "sa00-0.1e",    0x000000, 0x080000, CRC(ec6b3257) SHA1(10a42a680ce122ab030eaa2ccd99d302cb77854e) )

	ROM_REGION( 0x200000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcf-00.9a",    0x000000, 0x080000, CRC(247712dc) SHA1(bcb765afd7e756b68131c97c30d210de115d6b50) )
	ROM_CONTINUE( 0x100000, 0x080000)
	ROM_CONTINUE( 0x080000, 0x080000)
	ROM_CONTINUE( 0x180000, 0x080000)

	ROM_REGION( 0x800000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcf-02.14a",    0x000001, 0x200000, CRC(21251b33) SHA1(d252fe5c6eef8cbc9327e4176b4868b1cb17a738) )
	ROM_LOAD16_BYTE( "mcf-04.14h",    0x000000, 0x200000, CRC(4fa55577) SHA1(e229ba9cce46b92ce255aa33b974e19b214c4017) )
	ROM_LOAD16_BYTE( "mcf-01.13a",    0x400001, 0x200000, CRC(83881e25) SHA1(ae82cf0f704e6efea94c6c1d276d4e3e5b3ebe43) )
	ROM_LOAD16_BYTE( "mcf-03.14d",    0x400000, 0x200000, CRC(faf1d51d) SHA1(675dbbfe15b8010d54b2b3af26d42cdd753c2ce2) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "sa01-0.13h",    0x00000, 0x40000,  CRC(cea8368e) SHA1(1fcc641381fdc29bd50d3a4b23e67647f79e505a))

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcf-05.12f",    0x00000, 0x200000, CRC(f007d376) SHA1(4ba20e5dabeacc3278b7f30c4462864cbe8f6984) )
ROM_END

/*

Chain Reaction
Data East 1995

DE-0409-1

156           E1
       223    2063     93C45
              2063
                              223
               141
       28MHz         5864
                     5864
            6264
            6264
  MCC-00

  U5  U6     52      MCC-03   AD-65
  U3  U4             MCC-04   AD-65


*/

ROM_START( chainrec )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "e1",    0x000000, 0x080000, CRC(8a8340ef) SHA1(4aaee56127b73453b862ff2a33dc241eeabf5658) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcc-00",    0x000000, 0x100000, CRC(646b03ec) SHA1(9a2fc11b1575032b5a784d88c3a90913068d1e69) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD32_BYTE( "u3",    0x000000, 0x080000, CRC(92659721) SHA1(b446ce98ec9c2c16375ef00639cfb463b365b8f7) )
	ROM_LOAD32_BYTE( "u4",    0x000002, 0x080000, CRC(e304eb32) SHA1(61a647ec89695a6b25ff924bdc6d29cbd7aca82b) )
	ROM_LOAD32_BYTE( "u5",    0x000001, 0x080000, CRC(1b6f01ea) SHA1(753fc670707432e317d035b09b0bad0762fea731) )
	ROM_LOAD32_BYTE( "u6",    0x000003, 0x080000, CRC(531a56f2) SHA1(89602bb873a3b110bffc216f921ba228e53380f9) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "mcc-04",    0x00000, 0x40000,  CRC(86ee6ade) SHA1(56ad3f432c7f430f19fcba7c89940c63da165906) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcc-03",    0x00000, 0x100000, CRC(da2ebba0) SHA1(96d31dea4c7226ee1d386b286919fa334388c7a1) )
ROM_END

ROM_START( magdrop )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "re00-2.e1",    0x000000, 0x080000,  CRC(7138f10f) SHA1(ca93c3c2dc9a7dd6901c8429a6bf6883076a9b8f) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcc-00",    0x000000, 0x100000, CRC(646b03ec) SHA1(9a2fc11b1575032b5a784d88c3a90913068d1e69) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcc-01.a13",    0x000001, 0x100000, CRC(13d88745) SHA1(0ce4ec1481f31be860ee80322de6e32f9a566229) )
	ROM_LOAD16_BYTE( "mcc-02.a14",    0x000000, 0x100000, CRC(d0f97126) SHA1(3848a6f00d0e57aaf383298c4d111eb63a88b073) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "mcc-04",    0x00000, 0x40000,  CRC(86ee6ade) SHA1(56ad3f432c7f430f19fcba7c89940c63da165906) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcc-03",    0x00000, 0x100000, CRC(da2ebba0) SHA1(96d31dea4c7226ee1d386b286919fa334388c7a1) )

	ROM_REGION( 0x80, REGION_USER1, 0 ) /* eeprom */
	ROM_LOAD( "93c45.h2",    0x00, 0x80, CRC(16ce8d2d) SHA1(1a6883c75d34febbd92a16cfe204ff12550c85fd) )
ROM_END

ROM_START( magdropp )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "rz00-1.e1",    0x000000, 0x080000,  CRC(28caf639) SHA1(a17e792c82e65009e21680094acf093c0c4f1021) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcc-00",    0x000000, 0x100000, CRC(646b03ec) SHA1(9a2fc11b1575032b5a784d88c3a90913068d1e69) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcc-01.a13",    0x000001, 0x100000, CRC(13d88745) SHA1(0ce4ec1481f31be860ee80322de6e32f9a566229) )
	ROM_LOAD16_BYTE( "mcc-02.a14",    0x000000, 0x100000, CRC(d0f97126) SHA1(3848a6f00d0e57aaf383298c4d111eb63a88b073) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "mcc-04",    0x00000, 0x40000,  CRC(86ee6ade) SHA1(56ad3f432c7f430f19fcba7c89940c63da165906) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcc-03",    0x00000, 0x100000, CRC(da2ebba0) SHA1(96d31dea4c7226ee1d386b286919fa334388c7a1) )

	ROM_REGION( 0x80, REGION_USER1, 0 ) /* eeprom */
	ROM_LOAD( "eeprom.2h",    0x00, 0x80, CRC(d13d9edd) SHA1(e98ee2b696f0a7a8752dc30ef8b41bfe6598cbe4) )
ROM_END

/* Charlie Ninja

Charlie Ninja by Mitchell

rom E1  27c4002  labeled "ND 00-1"
rom H13  27c2001  labeled "ND 01-0"

maskrom b14  27c800  labeled "MBR-01"
maskrom h14  27c800  labeled "MBR-03"
maskrom h12  27c800  labeled "MBR-02"
maskrom b9   27c160  labeled "MBR-00"

*/

ROM_START( charlien )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "nd00-1.e1",    0x000000, 0x080000,  CRC(f18f4b23) SHA1(cb0c159b4dde3a3c5f295f270485996811e5e4d2) )

	ROM_REGION( 0x200000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mbr-00.b9",    0x000000, 0x080000, CRC(ecf2c7f0) SHA1(3c735a4eef2bc49f16ac9365a5689101f43c13e9) )
	ROM_CONTINUE( 0x100000, 0x080000)
	ROM_CONTINUE( 0x080000, 0x080000)
	ROM_CONTINUE( 0x180000, 0x080000)

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mbr-01.b14",    0x000001, 0x100000, CRC(46c90215) SHA1(152acdeea34ec1db3f761066a0c1ff6e43e47f9d) )
	ROM_LOAD16_BYTE( "mbr-03.h14",    0x000000, 0x100000, CRC(c448a68a) SHA1(4b607dfee269abdfeb710b74b73ef87dc2b30e8c) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "nd01-0.h13",    0x00000, 0x40000,  CRC(635a100a) SHA1(f6ec70890892e7557097ccd519de37247bb8c98d) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mbr-02.h12",    0x00000, 0x100000, CRC(4f67d333) SHA1(608f921bfa6b7020c0ce72e5229b3f1489208b23) ) /* 00, 01, 04, 05 */
ROM_END


/*
This is a bootleg (converted) board, dumped by Marco_A
there was a 42-pin rom which isn't dumped, i imagine its sound..

there is a rom which still looks to be encrypted, i guess its the cpu code
*/

ROM_START( joemacr )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "05.rom",    0x000000, 0x080000,  CRC(74e9a158) SHA1(eee447303ac0884e152b89f59a9694afade87336) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE )  /* rebuilt with roms from other set */
	ROM_LOAD( "01.rom",    0x000000, 0x080000,  CRC(4da4a2c1) SHA1(1ed4bd4337d8b185b56e326e662a8715e4d09e17) )
	ROM_LOAD( "02.rom",    0x080000, 0x080000,  CRC(642c08db) SHA1(9a541fd56ae34c24f803e08869702be6fafd81d1) )

	ROM_REGION( 0x100000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mbn01",    0x000001, 0x080000, CRC(a3a37353) SHA1(c4509c8268afb647c20e71b42ae8ebd2bdf075e6) ) /* 03.bin */
	ROM_LOAD16_BYTE( "mbn02",    0x000000, 0x080000,  CRC(aa2230c5) SHA1(43b7ac5c69cde1840a5255a8897e1c5d5f89fd7b) ) /* 04.bin */

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "mbn04",    0x00000, 0x40000,  CRC(dcbd4771) SHA1(2a1ab6b0fc372333c7eb17aab077fe1ca5ba1dea) ) /* 07.rom */

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) not in this set */
	ROM_LOAD( "mbn03",    0x00000, 0x200000, CRC(70b71a2a) SHA1(45851b0692de73016fc9b913316001af4690534c) )
ROM_END

/* Joe and Mac Returns

Joe and Mac Returns
Data East 1994

DE-0491-1

156         MW00
      223              223
             141

  MBN00

  MBN01   52   MBN03  M6295
  MBN02        MBN04  M6295

*/

ROM_START( joemacra )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "mw00",    0x000000, 0x080000,  CRC(e1b78f40) SHA1(e611c317ada5a049a5e05d69c051e22a43fa2845) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE ) /* rebuilt with roms from other set */
	ROM_LOAD( "mbn00",    0x000000, 0x100000, CRC(11b2dac7) SHA1(71a50f606caddeb0ef266e2d3df9e429a4873f21) )

	ROM_REGION( 0x100000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mbn01",    0x000001, 0x080000, CRC(a3a37353) SHA1(c4509c8268afb647c20e71b42ae8ebd2bdf075e6) )
	ROM_LOAD16_BYTE( "mbn02",    0x000000, 0x080000,  CRC(aa2230c5) SHA1(43b7ac5c69cde1840a5255a8897e1c5d5f89fd7b) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "mbn04",    0x00000, 0x40000,  CRC(dcbd4771) SHA1(2a1ab6b0fc372333c7eb17aab077fe1ca5ba1dea) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mbn03",    0x00000, 0x200000, CRC(70b71a2a) SHA1(45851b0692de73016fc9b913316001af4690534c) )
ROM_END


/*

Ganbare! Gonta!! 2 (Lady Killer Part 2 - Party Time)
(c)1995 Mitchell
DEC-22V0 (board is manufactured by DECO)
MT5601-0

CPU  : surface-scratched 100pin PQFP DECO custom?
Sound: M6295x2
OSC  : 28.0000MHz

ROMs:
rd_00-0.1e - Main program (27c4096)

mcb-00.9a  - Graphics? (23c16000)

mcb-01.13a - Graphics (23c16000)
mcb-02.14a |
mcb-03.14d |
mcb-05.14h /

rd_01-0.13h - Samples (27c020)

mcb-04.12f - Samples (23c16000)

GALs (16V8B, not dumped):
vz-00.5c
vz-01.4e
vz-02.8f

Custom chips:
Surface-scratched 128pin PQFP (location 12d) DECO 52?
Surface-scratched 100pin PQFP (location 5j)
Surface-scratched 160pin PQFP (location 6e) DECO 56?
Surface-scratched 100pin PQFP (location 2a)
Surface-scratched 100pin PQFP (location 3d)

Other:
EEPROM 93C45

*/

ROM_START( prtytime )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "pz_00-0.1e",    0x000000, 0x080000, CRC(ec715c87) SHA1(c9f28399d59b37977f31a5c67cb97af6c58947ae) )

	ROM_REGION( 0x200000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcb-00.9a",    0x000000, 0x080000, CRC(c48a4f2b) SHA1(2dee5f8507b2a7e6f7e44b14f9abca36d0ebf78b) )
	ROM_CONTINUE( 0x100000, 0x080000)
	ROM_CONTINUE( 0x080000, 0x080000)
	ROM_CONTINUE( 0x180000, 0x080000)

	ROM_REGION( 0x800000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcb-02.14a",    0x000001, 0x200000, CRC(423cfb38) SHA1(b8c772a8ab471c365a11a88c85e1c8c7d2ad6e80) )
	ROM_LOAD16_BYTE( "mcb-05.14h",    0x000000, 0x200000, CRC(81540cfb) SHA1(6f7bc62c3c4d4a29eb1e0cfb261ace461bbca57c) )
	ROM_LOAD16_BYTE( "mcb-01.13a",    0x400001, 0x200000, CRC(06f40a57) SHA1(896f1d373e911dcff7223bf21756ad35b28b4c5d) )
	ROM_LOAD16_BYTE( "mcb-03.14d",    0x400000, 0x200000, CRC(0aef73af) SHA1(76cf13f53da5202da80820f98660edee1eef7f1a) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "pz_01-0.13h",    0x00000, 0x40000,  CRC(8925bce2) SHA1(0ff2d5db7a24a2af30bd753eba274572c32cc2e7) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcb-04.12f",    0x00000, 0x200000, CRC(e23d3590) SHA1(dc8418edc525f56e84f26e9334d5576000b14e5f) )
ROM_END

ROM_START( gangonta )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* DE156 code (encrypted) */
	ROM_LOAD( "rd_00-0.1e",    0x000000, 0x080000, CRC(f80f43bb) SHA1(f9d26829eb90d41a6c410d4d673fe9595f814868) )

	ROM_REGION( 0x200000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "mcb-00.9a",    0x000000, 0x080000, CRC(c48a4f2b) SHA1(2dee5f8507b2a7e6f7e44b14f9abca36d0ebf78b) )
	ROM_CONTINUE( 0x100000, 0x080000)
	ROM_CONTINUE( 0x080000, 0x080000)
	ROM_CONTINUE( 0x180000, 0x080000)

	ROM_REGION( 0x800000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "mcb-02.14a",    0x000001, 0x200000, CRC(423cfb38) SHA1(b8c772a8ab471c365a11a88c85e1c8c7d2ad6e80) )
	ROM_LOAD16_BYTE( "mcb-05.14h",    0x000000, 0x200000, CRC(81540cfb) SHA1(6f7bc62c3c4d4a29eb1e0cfb261ace461bbca57c) )
	ROM_LOAD16_BYTE( "mcb-01.13a",    0x400001, 0x200000, CRC(06f40a57) SHA1(896f1d373e911dcff7223bf21756ad35b28b4c5d) )
	ROM_LOAD16_BYTE( "mcb-03.14d",    0x400000, 0x200000, CRC(0aef73af) SHA1(76cf13f53da5202da80820f98660edee1eef7f1a) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* Oki samples */
	ROM_LOAD( "rd_01-0.13h",    0x00000, 0x40000,  CRC(70fd18c6) SHA1(368cd8e10c5f5a13eb3813974a7e6b46a4fa6b6c) )

	ROM_REGION( 0x200000, REGION_SOUND2, 0 ) /* samples? (banked?) */
	ROM_LOAD( "mcb-04.12f",    0x00000, 0x200000, CRC(e23d3590) SHA1(dc8418edc525f56e84f26e9334d5576000b14e5f) )
ROM_END

/* some default eeproms */

unsigned char chainrec_eeprom[128] = {
	0x52, 0x54, 0x00, 0x50, 0x00, 0x00, 0x39, 0x11, 0x41, 0x54, 0x00, 0x43, 0x00, 0x50, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};

/* Cannon Dancer / Osman are odd, they don't init their own Eeprom...
  Roms on boths games are identical, and the Eeprom contains several settings the user isn't
  permitted to change, including region and button config..  the first  2 bytes must match the
  last first 2 bytes in the last block of 8 bytes, and the at 0x20 there must be 0088 or the game won't
  boot */

  /* the second byte of Eeprom contains the following

  (Switch 0 in test mode)

   -bssllfr (byte 0x01 / 0x79 of eeprom)

  *- = unknown / unused  (no observed effect)
  *b = button config (2 buttons, or 3 buttons)
   s = number of special weapons (bombs)
   l = lives
   f = flip (screen rotation)
  *r = region


  other settings

  Switch 1  (byte 0x00 / 0x78 of eeprom)

  ppdd -ecs

  p = number of players (health bar?)
  d = difficulty
 *- = unknown / unused  (no observed effect)
  e = extend score
  c = continue
  s = demo sound

 Switch 2  (byte 0x7d of eeprom)

  cccC CCxb

  ccc = coin1
  CCC = coin 2
 *x = breaks attract mode / game..
  b = blood


  items marked * the user can't configure in test mode

  I don't know if any of the other bytes in the eeprom are tested / used.

  1 in eeprom is 0 in test mode

  Both games are currently configured to 3 buttons, its possible the game was never
  released with a 2 button configuration.

   NOTE: an actual read of the eeprom appears to be byteswapped vs. this data / the file
         MAME outputs

*/

unsigned char osman_eeprom[128] = {
	0xFF, 0xBE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0x00, 0x88, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xBE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char candance_eeprom[128] = {
	0xFF, 0xBF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0x00, 0x88, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xBF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char prtytime_eeprom[128] = {
	0xAF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xDE, 0xDE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xED, 0xED, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xAF, 0x7F, 0xFF, 0xFF, 0x7F, 0xFE, 0xFF, 0xFF
};

unsigned char gangonta_eeprom[128] = {
	0x2F, 0xFF, 0x2F, 0xFF, 0xFF, 0xFE, 0xFF, 0xFE, 0xFF, 0xFE, 0xED, 0xCB, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};

/* Everything seems more stable if we run the CPU speed x4 and use Idle skips.. maybe it has an internal multipler? */
static READ32_HANDLER( joemacr_speedup_r )
{
	if (activecpu_get_pc()==0x284)  cpu_spinuntil_time(TIME_IN_USEC(400));
	return simpl156_systemram[0x18/4];
}


static DRIVER_INIT (joemacr)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201018, 0x020101b, 0, 0, joemacr_speedup_r );
	init_simpl156();
}

static READ32_HANDLER( chainrec_speedup_r )
{
	if (activecpu_get_pc()==0x2d4)  cpu_spinuntil_time(TIME_IN_USEC(400));
	return simpl156_systemram[0x18/4];
}

static DRIVER_INIT (chainrec)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201018, 0x020101b, 0, 0, chainrec_speedup_r );
	init_simpl156();
	simpl156_default_eeprom = chainrec_eeprom;
}

static READ32_HANDLER( prtytime_speedup_r )
{
	if (activecpu_get_pc()==0x4f0)  cpu_spinuntil_time(TIME_IN_USEC(400));
	return simpl156_systemram[0xae0/4];
}

static DRIVER_INIT (prtytime)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201ae0, 0x0201ae3, 0, 0, prtytime_speedup_r );
	init_simpl156();
	simpl156_default_eeprom = prtytime_eeprom;
}

static DRIVER_INIT (gangonta)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201ae0, 0x0201ae3, 0, 0, prtytime_speedup_r );
	init_simpl156();
	simpl156_default_eeprom = gangonta_eeprom;
}


static READ32_HANDLER( charlien_speedup_r )
{
	if (activecpu_get_pc()==0xc8c8)  cpu_spinuntil_time(TIME_IN_USEC(400));
	return simpl156_systemram[0x10/4];
}

static DRIVER_INIT (charlien)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201010, 0x0201013, 0, 0, charlien_speedup_r );
	init_simpl156();
}

static READ32_HANDLER( osman_speedup_r )
{
	if (activecpu_get_pc()==0x5974)  cpu_spinuntil_time(TIME_IN_USEC(400));
	return simpl156_systemram[0x10/4];
}

static DRIVER_INIT (osman)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201010, 0x0201013, 0, 0, osman_speedup_r );
	init_simpl156();
	simpl156_default_eeprom = osman_eeprom;

}

static DRIVER_INIT (candance)
{
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x0201010, 0x0201013, 0, 0, osman_speedup_r );
	init_simpl156();
	simpl156_default_eeprom = candance_eeprom;
}

GAME( 1996, osman,   0,        mitchell156,    simpl156, osman,         ROT0, "Mitchell", "Osman (World)", 0 )
GAME( 1996, candance,osman,    mitchell156,    simpl156, candance,      ROT0, "Mitchell (Atlus License)", "Cannon Dancer (Japan)", 0 )
GAME( 1995, chainrec,0,        chainrec,       simpl156, chainrec,      ROT0, "Data East","Chain Reaction (World, Version 2.2, 1995.09.25)", 0 )
GAME( 1995, magdrop, chainrec, magdrop,        simpl156, chainrec,      ROT0, "Data East","Magical Drop (Japan, Version 1.1, 1995.06.21)", 0 )
GAME( 1995, magdropp,chainrec, magdropp,       simpl156, chainrec,      ROT0, "Data East","Magical Drop Plus 1 (Japan, Version 2.1, 1995.09.12)", 0 )
GAME( 1995, charlien,0,        mitchell156,    simpl156, charlien,      ROT0, "Mitchell", "Charlie Ninja" , 0) /* language in service mode */
GAME( 1994, joemacr, 0,        joemacr,        simpl156, joemacr,       ROT0, "Data East", "Joe & Mac Returns (World, Version 1.1, 1994.05.27)", 0 )
GAME( 1994, joemacra,joemacr,  joemacr,        simpl156, joemacr,       ROT0, "Data East", "Joe & Mac Returns (World, Version 1.0, 1994.05.19)", 0 )
GAME( 1995, prtytime,0,        mitchell156,    simpl156, prtytime,      ROT90,"Mitchell", "Party Time: Gonta the Diver II / Ganbare! Gonta!! 2 (World Release)", 0) /* language is in service mode */
GAME( 1995, gangonta,prtytime, mitchell156,    simpl156, gangonta,      ROT90,"Mitchell", "Ganbare! Gonta!! 2 / Party Time: Gonta the Diver II (Japan Release)", 0) /* language is in service mode */
