/***************************************************************************

IQ Block   (c) 1992 IGS

Driver by Nicola Salmoria and Ernesto Corvi

TODO:
- Who generates IRQ and NMI? How many should there be per frame?

- Sound chip is a UM3567. Is this compatible to something already in MAME? yes, YM2413

- Coin 2 doesn't work? DIP switch setting?

- Protection:
  I can see it reading things like the R register here and there, so it might
  be cycle-dependant or something.

  'Crash 1' checks I was able to see:
  PC = $52FA
  PC = $507F

  'Crash 2' checks I was able to see:
  PC = $54E6

Stephh's notes :

  - Coin 2 as well as buttons 2 to 4 for each player are only read in "test mode".
    Same issue for Dip Siwtches 0-7 and 1-2 to 1-6.
    Some other games on the same hardware might use them.
  - Dip Switch 0 is stored at 0xf0ac and Dip Switch 1 is stored at 0xf0ad.
    However they are both read back at the same time with "ld   hl,($F0AC)" instructions.
  - Dip Switches 0-0 and 0-1 are read via code at 0x9470.
    This routine is called when you made a "line" after the routine that checks the score
    for awarding extra help and/or changing background.
    Data is coming from 4 possible tables (depending on them) which seem to be 0x84 bytes wide.
    Table 0 offset is 0xeaf7.
    IMO, this has something to do with difficulty but there is no confirmation about that !
  - Dip Switch 1-0 is read only once after the P.O.S.T. via code at 0xa200.
    It changes (or not) the contents of 0xf0db.w which can get these 2 possible values
    at start : 0x47a3 (when OFF) or 0x428e (when ON) which seem to be tables.
    If you set a WP to 0xf0db, you'll notice that it's called more often in the "demo mode"
    when the Dip Switch is ON, so, as it implies writes to outport 0x50b0, I think it has
    something to do with "Demo Sounds".
    I can't tell however if setting the Dip Switch to OFF means "Demo Sounds" OFF or ON !

Grndtour:
 - Title should flash 3X slowly. In MAME it flashes too fast, or strangely??


***************************************************************************/

#include "driver.h"
#include "cpu/z80/z80.h"
#include "cpu/z180/z180.h"
#include "deprecat.h"
#include "machine/8255ppi.h"
#include "iqblock.h"
#include "sound/2413intf.h"

static UINT8 *rambase;

static WRITE8_HANDLER( iqblock_prot_w )
{
    rambase[0xe26] = data;
    rambase[0xe27] = data;
    rambase[0xe1c] = data;
}

static WRITE8_HANDLER( grndtour_prot_w )
{
	rambase[0xe39] = data;
    rambase[0xe3a] = data;
    rambase[0xe2f] = data;

}


static INTERRUPT_GEN( iqblock_interrupt )
{
	if (cpu_getiloops(device) & 1)
		cpu_set_input_line(device, INPUT_LINE_NMI, PULSE_LINE);	/* ???? */
	else
		cpu_set_input_line(device, 0, ASSERT_LINE);			/* ???? */
}

static WRITE8_HANDLER( iqblock_irqack_w )
{
	cputag_set_input_line(space->machine, "maincpu", 0, CLEAR_LINE);
}

static READ8_HANDLER( extrarom_r )
{
	return memory_region(space->machine, "user1")[offset];
}


static WRITE8_DEVICE_HANDLER( port_C_w )
{
	/* bit 4 unknown; it is pulsed at the end of every NMI */

	/* bit 5 seems to be 0 during screen redraw */
	iqblock_videoenable = data & 0x20;

	/* bit 6 is coin counter */
	coin_counter_w(0,data & 0x40);

	/* bit 7 could be a second coin counter, but coin 2 doesn't seem to work... */
}

static const ppi8255_interface ppi8255_intf =
{
	DEVCB_INPUT_PORT("P1"),		/* Port A read */
	DEVCB_INPUT_PORT("P2"),		/* Port B read */
	DEVCB_INPUT_PORT("EXTRA"),	/* Port C read */
	DEVCB_NULL,					/* Port A write */
	DEVCB_NULL,					/* Port B write */
	DEVCB_HANDLER(port_C_w)		/* Port C write */
};


static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0xefff) AM_ROM
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_BASE(&rambase)
ADDRESS_MAP_END


static ADDRESS_MAP_START( main_portmap, ADDRESS_SPACE_IO, 8 )
	AM_RANGE(0x2000, 0x23ff) AM_WRITE(paletteram_xBBBBBGGGGGRRRRR_split1_w)
	AM_RANGE(0x2800, 0x2bff) AM_WRITE(paletteram_xBBBBBGGGGGRRRRR_split2_w)
	AM_RANGE(0x6000, 0x603f) AM_WRITE(iqblock_fgscroll_w)
	AM_RANGE(0x6800, 0x69ff) AM_WRITE(iqblock_fgvideoram_w)	/* initialized up to 6fff... bug or larger tilemap? */
	AM_RANGE(0x7000, 0x7fff) AM_WRITE(iqblock_bgvideoram_w)
	AM_RANGE(0x5080, 0x5083) AM_DEVWRITE("ppi8255", ppi8255_w)
	AM_RANGE(0x5080, 0x5083) AM_DEVREAD("ppi8255", ppi8255_r)
	AM_RANGE(0x5090, 0x5090) AM_READ_PORT("SW0")
	AM_RANGE(0x50a0, 0x50a0) AM_READ_PORT("SW1")
	AM_RANGE(0x50b0, 0x50b1) AM_DEVWRITE("ymsnd", ym2413_w) // UM3567_data_port_0_w
	AM_RANGE(0x50c0, 0x50c0) AM_WRITE(iqblock_irqack_w)
	AM_RANGE(0x7000, 0x7fff) AM_READ(iqblock_bgvideoram_r)
	AM_RANGE(0x8000, 0xffff) AM_READ(extrarom_r)
ADDRESS_MAP_END

static INPUT_PORTS_START( iqblock )
	PORT_START("P1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 )				// "test mode" only

	PORT_START("P2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN2 )					// "test mode" only
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL	// "test mode" only

	PORT_START("EXTRA")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON3 )				// "test mode" only
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON4 )				// "test mode" only
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_COCKTAIL	// "test mode" only
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_COCKTAIL	// "test mode" only
	PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("SW0")
	PORT_DIPNAME( 0x03, 0x03, "Unknown SW 0-0&1" )	// Difficulty ? Read notes above
	PORT_DIPSETTING(    0x03, "0" )
	PORT_DIPSETTING(    0x02, "1" )
	PORT_DIPSETTING(    0x01, "2" )
	PORT_DIPSETTING(    0x00, "3" )
	PORT_DIPNAME( 0x0c, 0x0c, "Helps" )
	PORT_DIPSETTING(    0x0c, "1" )
	PORT_DIPSETTING(    0x08, "2" )
	PORT_DIPSETTING(    0x04, "3" )
	PORT_DIPSETTING(    0x00, "4" )
	PORT_DIPNAME( 0x70, 0x70, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x70, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x60, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x50, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x40, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )

	PORT_START("SW1")
	PORT_DIPNAME( 0x01, 0x00, "Demo Sounds?" )	// To be confirmed ! Read notes above
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Free_Play ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unused ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )
INPUT_PORTS_END



static const gfx_layout tilelayout1 =
{
	8,8,
	RGN_FRAC(1,3),
	6,
	{ 8, 0, RGN_FRAC(1,3)+8, RGN_FRAC(1,3)+0, RGN_FRAC(2,3)+8, RGN_FRAC(2,3)+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 const gfx_layout tilelayout2 =
{
	8,32,
	RGN_FRAC(1,2),
	4,
	{ 8, 0, RGN_FRAC(1,2)+8, RGN_FRAC(1,2)+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, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16,
		16*16, 17*16, 18*16, 19*16, 20*16, 21*16, 22*16, 23*16,
		24*16, 25*16, 26*16, 27*16, 28*16, 29*16, 30*16, 31*16 },
	32*16
};

static const gfx_layout tilelayout3 =
{
	8,32,
	RGN_FRAC(1,3),
	6,
	{ 8, 0, RGN_FRAC(1,3)+8, RGN_FRAC(1,3)+0, RGN_FRAC(2,3)+8, RGN_FRAC(2,3)+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, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16,
		16*16, 17*16, 18*16, 19*16, 20*16, 21*16, 22*16, 23*16,
		24*16, 25*16, 26*16, 27*16, 28*16, 29*16, 30*16, 31*16 },
	32*16
};

static GFXDECODE_START( iqblock )
	GFXDECODE_ENTRY( "gfx1", 0, tilelayout1, 0, 16 )	/* only odd color codes are used */
	GFXDECODE_ENTRY( "gfx2", 0, tilelayout2, 0,  4 )	/* only color codes 0 and 3 used */
GFXDECODE_END



static MACHINE_DRIVER_START( iqblock )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", Z80,12000000/2)	/* 6 MHz */
	MDRV_CPU_PROGRAM_MAP(main_map)
	MDRV_CPU_IO_MAP(main_portmap)
	MDRV_CPU_VBLANK_INT_HACK(iqblock_interrupt,16)

	MDRV_PPI8255_ADD( "ppi8255", ppi8255_intf )

	/* video hardware */
	MDRV_SCREEN_ADD("screen", RASTER)
	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(64*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0*8, 64*8-1, 0*8, 30*8-1)

	MDRV_GFXDECODE(iqblock)
	MDRV_PALETTE_LENGTH(1024)

	MDRV_VIDEO_START(iqblock)
	MDRV_VIDEO_UPDATE(iqblock)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD("ymsnd", YM2413, 3579545)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END



/***************************************************************************

  Game driver(s)

***************************************************************************/

/*
IQ Block
IGS, 1996

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

IGS PCB N0- 0131-4
|---------------------------------------|
|uPD1242H     VOL    U3567   3.579545MHz|
|                               AR17961 |
|   HD64180RP8                          |
|  16MHz                         BATTERY|
|                                       |
|                         SPEECH.U17    |
|                                       |
|J                        6264          |
|A                                      |
|M      8255              V.U18         |
|M                                      |
|A                                      |
|                                       |
|                                       |
|                      |-------|        |
|                      |       |        |
|       CG.U7          |IGS017 |        |
|                      |       |        |
|       TEXT.U8        |-------|   PAL  |
|            22MHz               61256  |
|                   DSW1  DSW2  DSW3    |
|---------------------------------------|
Notes:
      HD64180RP8 - Hitachi HD64180 CPU. Clocks 16MHz (pins 2 & 3), 8MHz (pin 64)
      61256   - 32k x8 SRAM (DIP28)
      6264    - 8k x8 SRAM (DIP28)
      IGS017  - Custom IGS IC (QFP208)
      AR17961 - == Oki M6295 (QFP44). Clock 1.000MHz [16/16]. pin 7 = high
      U3567   - == YM2413. Clock 3.579545MHz
      VSync   - 60Hz
      HSync   - 15.31kHz
*/

ROM_START( iqblock )
	ROM_REGION( 0x20000, "maincpu", 0 )	/* 64k for code + 64K for extra RAM */
	ROM_LOAD( "u7.v5",        0x0000, 0x10000, CRC(811f306e) SHA1(d0aef80f1624002d05721276358f26a3ef69a3f6) )

	ROM_REGION( 0x8000, "user1", 0 )
	ROM_LOAD( "u8.6",         0x0000, 0x8000, CRC(2651bc27) SHA1(53e1d6ffd78c8a612863b29b0f8734e740d563c7) )	/* background maps, read by the CPU */

	ROM_REGION( 0x60000, "gfx1", 0 )
	ROM_LOAD( "u28.1",        0x00000, 0x20000, CRC(ec4b64b4) SHA1(000e9df0c0b5fcde5ead218dfcdc156bc4be909d) )
	ROM_LOAD( "u27.2",        0x20000, 0x20000, CRC(74aa3de3) SHA1(16757c24765d22026793a0c53d3f24c106951a18) )
	ROM_LOAD( "u26.3",        0x40000, 0x20000, CRC(2896331b) SHA1(51eba9f9f653a11cb96c461ab495d943d34cedc6) )

	ROM_REGION( 0x8000, "gfx2", 0 )
	ROM_LOAD( "u25.4",        0x0000, 0x4000, CRC(8fc222af) SHA1(ac1fb5e6caec391a76e3af51e133aecc65cd5aed) )
	ROM_LOAD( "u24.5",        0x4000, 0x4000, CRC(61050e1e) SHA1(1f7185b2a5a2e237120276c95344744b146b4bf6) )
ROM_END


/*
Grand Tour
IGS, 1993

This game probably runs on the same board as IGS's IQ Block.
Two of the PALs are labelled GRAND3 and GRAND4. However, there may be other
games that run on this same PCB also, since three of the PALs are
labelled AF1, AF2 and AF3, meaning the main/first game to run on this
hardware was called A-something F-something.


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

IGS PCB N0. 0036-5
----------------------------------------------
|                                 6264       |
|  UM3567                        GRAND6      |
|    3.579545MHz   GRAND1                    |
|                                GRAND7      |
|                  GRAND2                    |
|J                                           |
|A                 GRAND3                    |
|M                                    Z80    |
|M                 GRAND4                    |
|A                                    PAL    |
|    6116          GRAND5                    |
|    6116  IGS001          IGS002     PAL    |
|                  6264                      |
|                                     PAL    |
|  8255      PAL                             |
|                            PAL      12MHz  |
| DSW2(8) DSW1(8)                            |
----------------------------------------------

Notes:
      Z80 clock: 5.997MHz
          VSync: 60Hz
          HSync: 15.21kHz
          UM3567 compatible with YM2413
*/

ROM_START( grndtour )
	ROM_REGION( 0x20000, "maincpu", 0 )	/* 64k for code + 64K for extra RAM */
	ROM_LOAD( "grand7.u7",        0x0000, 0x10000, CRC(95cac31e) SHA1(47bbcce6981ea3d38e0aa49ccd3762a4529f3c96) )

	ROM_REGION( 0x8000, "user1", 0 )
	ROM_LOAD( "grand6.u8",         0x0000, 0x8000, CRC(4c634b86) SHA1(c36df147187bc526f2348bc2f4d4c4e35bb45f38) )	/* background maps, read by the CPU */

	ROM_REGION( 0xc0000, "gfx1", 0 )
	ROM_LOAD( "grand1.u28",        0x00000, 0x40000, CRC(de85c664) SHA1(3a4b0cac88a0fea1c80541fe49c799e3550bedee) )
	ROM_LOAD( "grand2.u27",        0x40000, 0x40000, CRC(8456204e) SHA1(b604d501f360670f57b937ad96af64c1c2038ef7) )
	ROM_LOAD( "grand3.u26",        0x80000, 0x40000, CRC(77632917) SHA1(d91eadec2e0fb3082299362d18814b8ec4c5e068) )

	ROM_REGION( 0x8000, "gfx2", 0 )
	ROM_LOAD( "grand4.u25",        0x0000, 0x4000, CRC(48d09746) SHA1(64669f572b9a98b078ee1ea0b614c117e5dfbec9) )
	ROM_LOAD( "grand5.u24",        0x4000, 0x4000, CRC(f896efb2) SHA1(8dc8546e363b4ff80983e3b8e2a19ebb7ff30c7b) )
ROM_END

static DRIVER_INIT( iqblock )
{
	UINT8 *rom = memory_region(machine, "maincpu");
	int i;

	/* decrypt the program ROM */
	for (i = 0;i < 0xf000;i++)
	{
		if ((i & 0x0282) != 0x0282) rom[i] ^= 0x01;
		if ((i & 0x0940) == 0x0940) rom[i] ^= 0x02;
		if ((i & 0x0090) == 0x0010) rom[i] ^= 0x20;
	}

	/* initialize pointers for I/O mapped RAM */
	paletteram         = rom + 0x12000;
	paletteram_2       = rom + 0x12800;
	iqblock_fgvideoram = rom + 0x16800;
	iqblock_bgvideoram = rom + 0x17000;
	memory_install_write8_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xfe26, 0xfe26, 0, 0, iqblock_prot_w);
	iqblock_video_type=1;
}

static DRIVER_INIT( grndtour )
{
	UINT8 *rom = memory_region(machine, "maincpu");
	int i;

	/* decrypt the program ROM */
	for (i = 0;i < 0xf000;i++)
	{
		if ((i & 0x0282) != 0x0282) rom[i] ^= 0x01;
		if ((i & 0x0940) == 0x0940) rom[i] ^= 0x02;
		if ((i & 0x0060) == 0x0040) rom[i] ^= 0x20;
	}

	/* initialize pointers for I/O mapped RAM */
	paletteram         = rom + 0x12000;
	paletteram_2       = rom + 0x12800;
	iqblock_fgvideoram = rom + 0x16800;
	iqblock_bgvideoram = rom + 0x17000;
	memory_install_write8_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xfe39, 0xfe39, 0, 0, grndtour_prot_w);
	iqblock_video_type=0;
}



GAME( 1993, iqblock,  0, iqblock,  iqblock, iqblock,  ROT0, "IGS", "IQ-Block", 0 )
GAME( 1993, grndtour, 0, iqblock,  iqblock, grndtour, ROT0, "IGS", "Grand Tour", 0 )
