text: #include "../vidhrdw/hexa.c"
  
  /****************************************************************************
  
  HEXA
  
  driver by Howie Cohen
  
  Memory map (prelim)
  0000 7fff ROM
  8000 bfff bank switch rom space??
  c000 c7ff RAM
  e000 e7ff video ram
  e800-efff unused RAM
  
  read:
  d001      AY8910 read
  f000      ???????
  
  write:
  d000      AY8910 control
  d001      AY8910 write
  d008      bit0/1 = flip screen x/y
            bit 4 = ROM bank??
            bit 5 = char bank
  		  other bits????????
  d010      watchdog reset, or IRQ acknowledge, or both
  f000      ????????
  
  NOTES:
          Needs High score save and load (i think the high score is stored
                  around 0xc709)
  
  *************************************************************************/
  
  #include "driver.h"
  #include "vidhrdw/generic.h"
  
  
  
  void hexa_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom);
  void hexa_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
  WRITE_HANDLER( hexa_d008_w );
  
  
  
  static struct MemoryReadAddress readmem[] =
  {
  	{ 0x0000, 0x7fff, MRA_ROM },
  	{ 0x8000, 0xbfff, MRA_BANK1 },
  	{ 0xc000, 0xc7ff, MRA_RAM },
  	{ 0xd001, 0xd001, AY8910_read_port_0_r },
  	{ 0xe000, 0xe7ff, MRA_RAM },
  	{ -1 } /* end of table */
  };
  
  static struct MemoryWriteAddress writemem[] =
  {
  	{ 0x0000, 0xbfff, MWA_ROM },
  	{ 0xc000, 0xc7ff, MWA_RAM },
  	{ 0xd000, 0xd000, AY8910_control_port_0_w },
  	{ 0xd001, 0xd001, AY8910_write_port_0_w },
  	{ 0xd008, 0xd008, hexa_d008_w },
  	{ 0xd010, 0xd010, watchdog_reset_w },	/* or IRQ acknowledge, or both */
  	{ 0xe000, 0xe7ff, videoram_w, &videoram, &videoram_size },
  	{ -1 } /* end of table */
  };
  
  
  
  INPUT_PORTS_START( hexa )
  	PORT_START	/* IN0 */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_4WAY )
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_4WAY )
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_4WAY )
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_4WAY )
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 )
  
  	PORT_START	/* DSW */
  	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Coinage ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x01, DEF_STR( 2C_1C ) )
  	PORT_DIPSETTING(    0x03, DEF_STR( 1C_1C ) )
  	PORT_DIPSETTING(    0x02, DEF_STR( 1C_2C ) )
  	PORT_DIPNAME( 0x04, 0x00, "Naughty Pics" )
  	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Flip_Screen ) )
  	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x30, 0x30, "Difficulty?" )
  	PORT_DIPSETTING(    0x30, "Easy?" )
  	PORT_DIPSETTING(    0x20, "Medium?" )
  	PORT_DIPSETTING(    0x10, "Hard?" )
  	PORT_DIPSETTING(    0x00, "Hardest?" )
  	PORT_DIPNAME( 0x40, 0x40, "Pobys" )
  	PORT_DIPSETTING(    0x40, "2" )
  	PORT_DIPSETTING(    0x00, "4" )
  	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Demo_Sounds ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
  INPUT_PORTS_END
  
  
  
  static struct GfxLayout charlayout =
  {
  	8,8,    /* 8 by 8 */
  	4096,   /* 4096 characters */
  	3,		/* 3 bits per pixel */
  	{ 2*4096*8*8, 4096*8*8, 0 },	/* plane */
  	{ 0, 1, 2, 3, 4, 5, 6, 7 },		/* x bit */
  	{ 8*0, 8*1, 8*2, 8*3, 8*4, 8*5, 8*6, 8*7 }, 	/* y bit */
  	8*8
  };
  
  
  
  static struct GfxDecodeInfo gfxdecodeinfo[] =
  {
  	{ REGION_GFX1, 0x0000, &charlayout,  0 , 32 },
  	{ -1 } /* end of array */
  };
  
  
  
  static struct AY8910interface ay8910_interface =
  {
  	1,	/* 1 chip */
  	1500000,	/* 1.5 MHz ???? */
  	{ 50 },
  	{ input_port_0_r },
  	{ input_port_1_r },
  	{ 0 },
  	{ 0 }
  };
  
  
  
  static struct MachineDriver machine_driver_hexa =
  {
  	/* basic machine hardware */
  	{
  		{
  			CPU_Z80,
  			4000000,		/* 4 MHz ??????? */
  			readmem,writemem,0,0,
  			interrupt,1
  		}
  	},
  	60, DEFAULT_60HZ_VBLANK_DURATION,	/* frames per second, vblank duration */
  	1,					/* single CPU, no need for interleaving */
  	0,
  
  	/* video hardware */
  	32*8, 32*8, { 0*8, 32*8-1, 2*8, 30*8-1 },
  	gfxdecodeinfo,
  	256, 256,
  	hexa_vh_convert_color_prom,
  
  
  	VIDEO_TYPE_RASTER | VIDEO_SUPPORTS_DIRTY,
  	0,					/* vh_init routine */
  	generic_vh_start,		/* vh_start routine */
  	generic_vh_stop,		/* vh_stop routine */
  	hexa_vh_screenrefresh,	/* vh_update routine */
  
  	/* sound hardware */
  	0,0,0,0,
  	{
  		{
  			SOUND_AY8910,
  			&ay8910_interface
  		}
  	}
  };
  
  
  
  /***************************************************************************
  
    Game driver(s)
  
  ***************************************************************************/
  
  ROM_START( hexa )
  	ROM_REGION( 0x18000, REGION_CPU1 )		/* 64k for code + 32k for banked ROM */
  	ROM_LOAD( "hexa.20",      0x00000, 0x8000, 0x98b00586 )
  	ROM_LOAD( "hexa.21",      0x10000, 0x8000, 0x3d5d006c )
  
  	ROM_REGION( 0x18000, REGION_GFX1 | REGIONFLAG_DISPOSE )
  	ROM_LOAD( "hexa.17",      0x00000, 0x8000, 0xf6911dd6 )
  	ROM_LOAD( "hexa.18",      0x08000, 0x8000, 0x6e3d95d2 )
  	ROM_LOAD( "hexa.19",      0x10000, 0x8000, 0xffe97a31 )
  
  	ROM_REGION( 0x0300, REGION_PROMS )
  	ROM_LOAD( "hexa.001",     0x0000, 0x0100, 0x88a055b4 )
  	ROM_LOAD( "hexa.003",     0x0100, 0x0100, 0x3e9d4932 )
  	ROM_LOAD( "hexa.002",     0x0200, 0x0100, 0xff15366c )
  ROM_END
  
  
  
  static void init_hexa(void)
  {
  	unsigned char *RAM = memory_region(REGION_CPU1);
  
  
  	/* Hexa is not protected or anything, but it keeps writing 0x3f to register */
  	/* 0x07 of the AY8910, to read the input ports. This causes clicks in the */
  	/* music since the output channels are continuously disabled and reenabled. */
  	/* To avoid that, we just NOP out the 0x3f write. */
  	RAM[0x0124] = 0x00;
  	RAM[0x0125] = 0x00;
  	RAM[0x0126] = 0x00;
  }
  
  
  GAME( ????, hexa, 0, hexa, hexa, hexa, ROT0, "D. R. Korea", "Hexa" )
  