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

 Eolith 16 bits hardware

 Supported Games:
 - KlonDike+      (c) 1999 Eolith

 driver by Pierpaolo Prazzoli

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

#include "driver.h"
#include "machine/eeprom.h"
#include "sound/okim6295.h"
#include "eolithsp.h"

static UINT16 *vram;
static int vbuffer = 0;

// It's configured for 512 bytes
static struct EEPROM_interface eeprom_interface_93C66 =
{
	9,				// address bits 9
	8,				// data bits    8
	"*110",			// read         110 aaaaaaaaa
	"*101",			// write        101 aaaaaaaaa dddddddd
	"*111",			// erase        111 aaaaaaaaa
	"*10000xxxxxx",	// lock         100 00xxxxxxx
	"*10011xxxxxx"	// unlock       100 11xxxxxxx
};

static WRITE16_HANDLER( eeprom_w )
{
	vbuffer = (data & 0x80) >> 7;
	coin_counter_w(0, data & 1);

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

	//data & 0x100 and data & 0x004 always set
}

static READ16_HANDLER( eolith16_custom_r )
{
	eolith_speedup_read();
	return (readinputport(0) & ~0x10) | (EEPROM_read_bit() << 4);
}



static WRITE16_HANDLER( vram_w )
{
	COMBINE_DATA(&vram[offset + (0x10000/2) * vbuffer]);
}

static READ16_HANDLER( vram_r )
{
	return vram[offset + (0x10000/2) * vbuffer];
}

static ADDRESS_MAP_START( eolith16_map, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x00000000, 0x001fffff) AM_RAM
	AM_RANGE(0x50000000, 0x5000ffff) AM_READWRITE(vram_r, vram_w)
	AM_RANGE(0x90000000, 0x9000002f) AM_WRITENOP //?
	AM_RANGE(0xff000000, 0xff1fffff) AM_ROM AM_REGION(REGION_USER2, 0)
	AM_RANGE(0xffe40000, 0xffe40001) AM_READWRITE(OKIM6295_status_0_lsb_r, OKIM6295_data_0_lsb_w)
	AM_RANGE(0xffe80000, 0xffe80001) AM_WRITE(eeprom_w)
	AM_RANGE(0xffea0000, 0xffea0001) AM_READ(eolith16_custom_r)
	AM_RANGE(0xffea0002, 0xffea0003) AM_READ(input_port_1_word_r)
	AM_RANGE(0xffec0000, 0xffec0001) AM_READNOP // not used?
	AM_RANGE(0xffec0002, 0xffec0003) AM_READ(input_port_2_word_r)
	AM_RANGE(0xfff80000, 0xffffffff) AM_ROM AM_REGION(REGION_USER1, 0)
ADDRESS_MAP_END

INPUT_PORTS_START( eolith16 )
	PORT_START
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_SPECIAL ) // eeprom bit
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM(eolith_speedup_getvblank, 0)
	PORT_BIT( 0xff6f, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_SERVICE1 )
	PORT_SERVICE_NO_TOGGLE( 0x0040, IP_ACTIVE_LOW )
	PORT_BIT( 0xff80, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP    ) PORT_PLAYER(1)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN  ) PORT_PLAYER(1)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT  ) PORT_PLAYER(1)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0xffe0, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END

VIDEO_START( eolith16 )
{
	vram = auto_malloc(0x10000*2);

	return 0;
}

VIDEO_UPDATE( eolith16 )
{
	int x,y,count;
	int color;

	count = 0;
	for (y=0;y < 204;y++)
	{
		for (x=0;x < 320/2;x++)
		{
			color = vram[count + (0x10000/2) * (vbuffer ^ 1)] & 0xff;
			plot_pixel(bitmap, x*2 + 0, y, machine->pens[color]);

			color = (vram[count + (0x10000/2) * (vbuffer ^ 1)] & 0xff00) >> 8;
			plot_pixel(bitmap, x*2 + 1, y, machine->pens[color]);

			count++;
		}
	}
	return 0;
}

static NVRAM_HANDLER( eolith16_eeprom )
{
	if (read_or_write)
		EEPROM_save(file);
	else
	{
		EEPROM_init(&eeprom_interface_93C66);
		if (file)	EEPROM_load(file);
	}
}

// setup a custom palette because pixels use 8 bits per color
PALETTE_INIT( eolith16 )
{
	int c;

	for (c = 0; c < 256; c++)
	{
		int bit0,bit1,bit2,r,g,b;
		bit0 = (c >> 0) & 0x01;
		bit1 = (c >> 1) & 0x01;
		bit2 = (c >> 2) & 0x01;
		r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = (c >> 3) & 0x01;
		bit1 = (c >> 4) & 0x01;
		bit2 = (c >> 5) & 0x01;
		g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = (c >> 6) & 0x01;
		bit1 = (c >> 7) & 0x01;
		b = 0x55 * bit0 + 0xaa * bit1;

		palette_set_color(machine,c,r,g,b);
	}
}



static MACHINE_DRIVER_START( eolith16 )
	MDRV_CPU_ADD(E116T, 60000000)		 /* 60 MHz */
	MDRV_CPU_PROGRAM_MAP(eolith16_map,0)
	MDRV_CPU_VBLANK_INT(eolith_speedup,262)

	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(0)

	MDRV_NVRAM_HANDLER(eolith16_eeprom)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(512, 512)
	MDRV_SCREEN_VISIBLE_AREA(0, 319, 0, 199)
	MDRV_PALETTE_LENGTH(256)

	MDRV_PALETTE_INIT(eolith16)
	MDRV_VIDEO_START(eolith16)
	MDRV_VIDEO_UPDATE(eolith16)

	MDRV_SPEAKER_STANDARD_STEREO("left", "right")

	MDRV_SOUND_ADD(OKIM6295, 1000000)
	MDRV_SOUND_CONFIG(okim6295_interface_region_1_pin7high)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "left", 1.0)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "right", 1.0)
MACHINE_DRIVER_END

/*

KlonDike+
Eolith, 1999

This game is like Freecell which comes with Windows XP etc

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

9812C
|-------------------------------------------|
|TDA1519A      KD.U28  PAL        RESET_SW  |
|     VOL  M6295   1MHz                60MHz|
|               EV0514-001                  |
|        14.31818MHz            E1-16T      |
|                                           |
|                          GM71C18160       |
|   TEST_SW                                 |
|J                                          |
|A                  KM6161002               |
|M  SERV_SW                                 |
|M                              KD.U5       |
|A                                          |
|                               93C66       |
|                                           |
|                                           |
|                                     TL7705|
|                                           |
|    *    *    *    *    *    KD.U31        |
|                                           |
|-------------------------------------------|
Notes:
      E1-16T - Main CPU, HyperStone E1-16T, clock input 60.000MHz (TQFP100)
      M6294  - Oki M6295 sound chip, clock 1.000MHz, sample rate = 1000000 / 132 (QFP44)
      93C66  - Atmel 93C66 4096bit Serial EEPROM (DIP8)
   KM6161002 - Samsung Electronics KM6161002BJ-10 64k x16 High Speed CMOS Static RAM (SOJ44)
  GM71C18160 - LG Semiconductor GM71C18160CJ6 1M x16 DRAM (SOJ42)
  EV0514-001 - Custom Eolith IC (QFP100)
      VSync  - 60Hz
      HSync  - 15.64kHz
          *  - Empty DIP42 sockets
       ROMs  -
               KD.U28 - TMS27C040 EPROM, M6295 samples (DIP32)
               KD.U5  - TMS27C040 EPROM, Main Program (DIP32)
               KD.U31 - ST M27C160 EPROM, Graphics Data (DIP42)
*/

ROM_START( klondkp )
	ROM_REGION16_BE( 0x80000, REGION_USER1, 0 ) /* E1-16T program code */
	ROM_LOAD( "kd.u5",  0x000000, 0x080000, CRC(591f0c73) SHA1(a9f338204c77a724fa6a6e08d78ca89bd5191aba) )

	ROM_REGION16_BE( 0x200000, REGION_USER2, 0 ) /* gfx data */
	ROM_LOAD16_WORD_SWAP( "kd.u31", 0x000000, 0x200000, CRC(e5dd12b5) SHA1(0a0cd75cbcdccce3575e5a58ba09c88452e1a5ee) )

	ROM_REGION( 0x80000, REGION_SOUND1, 0 ) /* oki samples */
	ROM_LOAD( "kd.u28", 0x000000, 0x080000, CRC(c12112a1) SHA1(729bbaca6db933a730099a4a560a10ed99cae1c3) )
ROM_END

DRIVER_INIT( eolith16 )
{
	init_eolith_speedup(Machine);
}

GAME( 1999, klondkp, 0, eolith16, eolith16, eolith16, ROT0, "Eolith", "KlonDike+", 0 )
