text: /***************************************************************************
  
  Gun Dealer memory map
  
  driver by Nicola Salmoria
  
  Yam! Yam!? runs on the same hardware but has a protection device which can
             access RAM at e000. Program writes to e000 and expects a value back
             at e001, then jumps to subroutines at e010 and e020. Also, the
             player and coin inputs appear magically at e004-e006.
  
  0000-7fff ROM
  8000-bfff ROM (banked)
  c400-c7ff palette RAM
  c800-cfff background video RAM
  d000-dfff foreground (scrollable) video RAM.
  e000-ffff work RAM
  
  read:
  c000      DSW0
  c001      DSW1
  c004      COIN (Gun Dealer only)
  c005      IN1 (Gun Dealer only)
  c006      IN0 (Gun Dealer only)
  
  write:
  c010-c011 foreground scroll x lo-hi (Yam Yam)
  c012-c013 foreground scroll y lo-hi (Yam Yam)
  c014      flip screen
  c015      Yam Yam only, maybe reset protection device
  c016      ROM bank selector
  c020-c021 foreground scroll x hi-lo (Gun Dealer)
  c022-c023 foreground scroll y hi-lo (Gun Dealer)
  
  I/O:
  read:
  01        YM2203 read
  
  write:
  00        YM2203 control
  01        YM2203 write
  
  Interrupts:
  Runs in interrupt mode 0, the interrupt vectors are 0xcf (RST 08h) and
  0xd7 (RST 10h)
  
  ***************************************************************************/
  
  #include "driver.h"
  #include "cpu/z80/z80.h"
  #include "deprecat.h"
  #include "sound/2203intf.h"
  
  
  extern UINT8 *gundealr_bg_videoram,*gundealr_fg_videoram;
  
  static UINT8 *rambase;
  
  WRITE8_HANDLER( gundealr_paletteram_w );
  WRITE8_HANDLER( gundealr_bg_videoram_w );
  WRITE8_HANDLER( gundealr_fg_videoram_w );
  WRITE8_HANDLER( gundealr_fg_scroll_w );
  WRITE8_HANDLER( yamyam_fg_scroll_w );
  WRITE8_HANDLER( gundealr_flipscreen_w );
  VIDEO_UPDATE( gundealr );
  VIDEO_START( gundealr );
  
  
  static int input_ports_hack;
  
  static INTERRUPT_GEN( yamyam_interrupt )
  {
  	if (cpu_getiloops(device) == 0)
  	{
  		if (input_ports_hack)
  		{
  			rambase[0x004] = input_port_read(device->machine, "IN2");
  			rambase[0x005] = input_port_read(device->machine, "IN1");
  			rambase[0x006] = input_port_read(device->machine, "IN0");
  		}
  		cpu_set_input_line_and_vector(device, 0, HOLD_LINE, 0xd7);	/* RST 10h vblank */
  	}
  	else if ((cpu_getiloops(device) & 1) == 1)
  		cpu_set_input_line_and_vector(device, 0, HOLD_LINE, 0xcf);	/* RST 08h sound (hand tuned) */
  }
  
  static WRITE8_HANDLER( yamyam_bankswitch_w )
  {
   	int bankaddress;
  	UINT8 *RAM = memory_region(space->machine, "maincpu");
  
  	bankaddress = 0x10000 + (data & 0x07) * 0x4000;
  	memory_set_bankptr(space->machine, 1,&RAM[bankaddress]);
  }
  
  static WRITE8_HANDLER( yamyam_protection_w )
  {
  logerror("e000 = %02x\n",rambase[0x000]);
  	rambase[0x000] = data;
  	if (data == 0x03) rambase[0x001] = 0x03;
  	if (data == 0x04) rambase[0x001] = 0x04;
  	if (data == 0x05) rambase[0x001] = 0x05;
  	if (data == 0x0a) rambase[0x001] = 0x08;
  	if (data == 0x0d) rambase[0x001] = 0x07;
  
  	if (data == 0x03)
  	{
  		/*
          read dip switches
          3a 00 c0  ld   a,($c000)
          47        ld   b,a
          3a 01 c0  ld   a,($c001)
          c9        ret
          */
  		rambase[0x010] = 0x3a;
  		rambase[0x011] = 0x00;
  		rambase[0x012] = 0xc0;
  		rambase[0x013] = 0x47;
  		rambase[0x014] = 0x3a;
  		rambase[0x015] = 0x01;
  		rambase[0x016] = 0xc0;
  		rambase[0x017] = 0xc9;
  	}
  	if (data == 0x05)
  	{
  		/*
          add a to hl
          c5        push    bc
          010000    ld      bc,#0000
          4f        ld      c,a
          09        add     hl,bc
          c1        pop     bc
          c9        ret
          */
  		rambase[0x020] = 0xc5;
  		rambase[0x021] = 0x01;
  		rambase[0x022] = 0x00;
  		rambase[0x023] = 0x00;
  		rambase[0x024] = 0x4f;
  		rambase[0x025] = 0x09;
  		rambase[0x026] = 0xc1;
  		rambase[0x027] = 0xc9;
  		/*
          lookup data in table
          cd20e0    call    #e020
          7e        ld      a,(hl)
          c9        ret
          */
  		rambase[0x010] = 0xcd;
  		rambase[0x011] = 0x20;
  		rambase[0x012] = 0xe0;
  		rambase[0x013] = 0x7e;
  		rambase[0x014] = 0xc9;
  	}
  }
  
  
  
  static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 8 )
  	AM_RANGE(0x0000, 0x7fff) AM_ROM
  	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK(1)
  	AM_RANGE(0xc000, 0xc000) AM_READ_PORT("DSW0")	/* DSW0 */
  	AM_RANGE(0xc001, 0xc001) AM_READ_PORT("DSW1")	/* DSW1 */
  	AM_RANGE(0xc004, 0xc004) AM_READ_PORT("IN0")	/* COIN (Gun Dealer only) */
  	AM_RANGE(0xc005, 0xc005) AM_READ_PORT("IN1")	/* IN1 (Gun Dealer only) */
  	AM_RANGE(0xc006, 0xc006) AM_READ_PORT("IN2")	/* IN0 (Gun Dealer only) */
  	AM_RANGE(0xc010, 0xc013) AM_WRITE(yamyam_fg_scroll_w)		/* Yam Yam only */
  	AM_RANGE(0xc014, 0xc014) AM_WRITE(gundealr_flipscreen_w)
  	AM_RANGE(0xc016, 0xc016) AM_WRITE(yamyam_bankswitch_w)
  	AM_RANGE(0xc020, 0xc023) AM_WRITE(gundealr_fg_scroll_w)	/* Gun Dealer only */
  	AM_RANGE(0xc400, 0xc7ff) AM_RAM_WRITE(gundealr_paletteram_w) AM_BASE(&paletteram)
  	AM_RANGE(0xc800, 0xcfff) AM_RAM_WRITE(gundealr_bg_videoram_w) AM_BASE(&gundealr_bg_videoram)
  	AM_RANGE(0xd000, 0xdfff) AM_RAM_WRITE(gundealr_fg_videoram_w) AM_BASE(&gundealr_fg_videoram)
  	AM_RANGE(0xe000, 0xffff) AM_RAM AM_BASE(&rambase)
  ADDRESS_MAP_END
  
  static ADDRESS_MAP_START( main_portmap, ADDRESS_SPACE_IO, 8 )
  	ADDRESS_MAP_GLOBAL_MASK(0xff)
  	AM_RANGE(0x00, 0x01) AM_DEVREADWRITE("ym", ym2203_r, ym2203_w)
  ADDRESS_MAP_END
  
  
  
  static INPUT_PORTS_START( gundealr )
  	PORT_START("DSW0")	/* DSW0 */
  	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW1:8") /* Listed in the manual as always OFF */
  	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW1:7") /* Listed in the manual as always OFF */
  	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Difficulty ) )	PORT_DIPLOCATION("SW1:6,5")
  	PORT_DIPSETTING(    0x0c, DEF_STR( Easy ) )
  	PORT_DIPSETTING(    0x08, DEF_STR( Medium ) )
  	PORT_DIPSETTING(    0x04, DEF_STR( Hard ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
  	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Demo_Sounds ) )	PORT_DIPLOCATION("SW1:4") /* Listed in the manual as always OFF */
  	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW1:3") /* Listed in the manual as always OFF */
  	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Cabinet ) )		PORT_DIPLOCATION("SW1:2")
  	PORT_DIPSETTING(    0x00, DEF_STR( Upright ) )
  	PORT_DIPSETTING(    0x40, DEF_STR( Cocktail ) )
  	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Flip_Screen ) )	PORT_DIPLOCATION("SW1:1")
  	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
  
  	PORT_START("DSW1")	/* DSW1 */
  	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coin_A ) )		PORT_DIPLOCATION("SW2:8,7,6")
  	PORT_DIPSETTING(    0x00, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x01, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x02, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ) )
  	PORT_DIPSETTING(    0x07, DEF_STR( 1C_1C ) )
  	PORT_DIPSETTING(    0x06, DEF_STR( 1C_2C ) )
  	PORT_DIPSETTING(    0x05, DEF_STR( 1C_3C ) )
  	PORT_DIPSETTING(    0x04, DEF_STR( 1C_4C ) )
  	PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_B ) )		PORT_DIPLOCATION("SW2:5,4,3")
  	PORT_DIPSETTING(    0x00, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x08, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x10, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x18, DEF_STR( 2C_1C ) )
  	PORT_DIPSETTING(    0x38, DEF_STR( 1C_1C ) )
  	PORT_DIPSETTING(    0x30, DEF_STR( 1C_2C ) )
  	PORT_DIPSETTING(    0x28, DEF_STR( 1C_3C ) )
  	PORT_DIPSETTING(    0x20, DEF_STR( 1C_4C ) )
  	PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW2:2,1") /* Both switch 1 & 2 are listed in the manual as always OFF */
  	PORT_DIPSETTING(    0x00, "0" )
  	PORT_DIPSETTING(    0x40, "1" )
  	PORT_DIPSETTING(    0x80, "2" )
  	PORT_DIPSETTING(    0xc0, "3" )
  
  	PORT_START("IN0")	/* COIN */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE1 )
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START1 )
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
  
  	PORT_START("IN1")	/* Player 2 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  
  	PORT_START("IN2")	/* Player 1 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  INPUT_PORTS_END
  
  static INPUT_PORTS_START( gundealt )
  	PORT_START("DSW0")	/* DSW0 */
  	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) )
  	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )
  	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Difficulty ) )
  	PORT_DIPSETTING(    0x0c, DEF_STR( Easy ) )
  	PORT_DIPSETTING(    0x08, DEF_STR( Medium ) )
  	PORT_DIPSETTING(    0x04, DEF_STR( Hard ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
  	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Demo_Sounds ) )
  	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
  	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Cabinet ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Upright ) )
  	PORT_DIPSETTING(    0x40, DEF_STR( Cocktail ) )
  	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Flip_Screen ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
  
  	PORT_START("DSW1")	/* DSW1 */
  	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coin_A ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x01, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x02, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ) )
  	PORT_DIPSETTING(    0x07, DEF_STR( 1C_1C ) )
  	PORT_DIPSETTING(    0x06, DEF_STR( 1C_2C ) )
  	PORT_DIPSETTING(    0x05, DEF_STR( 1C_3C ) )
  	PORT_DIPSETTING(    0x04, DEF_STR( 1C_4C ) )
  	PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_B ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x08, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x10, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x18, DEF_STR( 2C_1C ) )
  	PORT_DIPSETTING(    0x38, DEF_STR( 1C_1C ) )
  	PORT_DIPSETTING(    0x30, DEF_STR( 1C_2C ) )
  	PORT_DIPSETTING(    0x28, DEF_STR( 1C_3C ) )
  	PORT_DIPSETTING(    0x20, DEF_STR( 1C_4C ) )
  	PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Unknown ) )
  	PORT_DIPSETTING(    0x00, "0" )
  	PORT_DIPSETTING(    0x40, "1" )
  	PORT_DIPSETTING(    0x80, "2" )
  	PORT_DIPSETTING(    0xc0, "3" )
  
  	PORT_START("IN0")	/* Player 1 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  
  	PORT_START("IN1")	/* Player 2 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  
  	PORT_START("IN2")	/* COIN */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE1 )
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START1 )
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
  INPUT_PORTS_END
  
  static INPUT_PORTS_START( yamyam )
  	PORT_START("DSW0")	/* DSW0 */
  	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Lives ) )		PORT_DIPLOCATION("SW1:1,2")
  	PORT_DIPSETTING(    0x00, "3" )
  	PORT_DIPSETTING(    0x01, "4" )
  	PORT_DIPSETTING(    0x02, "5" )
  	PORT_DIPSETTING(    0x03, "6" )
  	PORT_DIPNAME( 0x0c, 0x00, "Difficulty?" )		PORT_DIPLOCATION("SW1:3,4")
  	PORT_DIPSETTING(    0x00, "Easy?" )
  	PORT_DIPSETTING(    0x04, "Medium?" )
  	PORT_DIPSETTING(    0x08, "Hard?" )
  	PORT_DIPSETTING(    0x0c, "Hardest?" )
  	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Demo_Sounds ) )	PORT_DIPLOCATION("SW1:5")
  	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW1:6")
  	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
  	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Cabinet ) )		PORT_DIPLOCATION("SW1:7")
  	PORT_DIPSETTING(    0x40, DEF_STR( Upright ) )
  	PORT_DIPSETTING(    0x00, DEF_STR( Cocktail ) )
  	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Flip_Screen ) )	PORT_DIPLOCATION("SW1:8")
  	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
  
  	PORT_START("DSW1")	/* DSW1 */
  	PORT_DIPNAME( 0x07, 0x00, DEF_STR( Coin_A ) )		PORT_DIPLOCATION("SW2:1,2,3")
  	PORT_DIPSETTING(    0x07, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x06, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x05, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x04, DEF_STR( 2C_1C ) )
  /*  PORT_DIPSETTING(    0x03, DEF_STR( 1C_1C ) ) */
  /*  PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ) ) */
  /*  PORT_DIPSETTING(    0x01, DEF_STR( 1C_1C ) ) */
  	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
  	PORT_DIPNAME( 0x38, 0x00, DEF_STR( Coin_B ) )		PORT_DIPLOCATION("SW2:4,5,6")
  	PORT_DIPSETTING(    0x38, DEF_STR( 5C_1C ) )
  	PORT_DIPSETTING(    0x30, DEF_STR( 4C_1C ) )
  	PORT_DIPSETTING(    0x28, DEF_STR( 3C_1C ) )
  	PORT_DIPSETTING(    0x20, DEF_STR( 2C_1C ) )
  /*  PORT_DIPSETTING(    0x18, DEF_STR( 1C_1C ) ) */
  /*  PORT_DIPSETTING(    0x10, DEF_STR( 1C_1C ) ) */
  /*  PORT_DIPSETTING(    0x08, DEF_STR( 1C_1C ) ) */
  	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
  	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Free_Play ) )	PORT_DIPLOCATION("SW2:7")
  	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
  	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
  	PORT_SERVICE_DIPLOC(   0x80, IP_ACTIVE_LOW, "SW2:8" )
  
  	PORT_START("IN0")	/* COIN */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_SERVICE1 )
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START1 )
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_TILT )	/* "TEST" */
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
  
  	PORT_START("IN1")	/* Player 2 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(2)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  
  	PORT_START("IN2")	/* Player 1 controls */
  	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_PLAYER(1)
  	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
  	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
  	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* probably unused */
  INPUT_PORTS_END
  
  
  
  static const gfx_layout charlayout =
  {
  	8,8,
  	RGN_FRAC(1,1),
  	4,
  	{ 0, 1, 2, 3 },
  	{ 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4 },
  	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32 },
  	32*8
  };
  
  static const gfx_layout spritelayout =
  {
  	16,16,
  	RGN_FRAC(1,1),
  	4,
  	{ 0, 1, 2, 3 },
  	{ 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4,
  			16*32+0*4, 16*32+1*4, 16*32+2*4, 16*32+3*4, 16*32+4*4, 16*32+5*4, 16*32+6*4, 16*32+7*4 },
  	{ 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 },
  	128*8
  };
  
  static GFXDECODE_START( gundealr )
  	GFXDECODE_ENTRY( "gfx1", 0, charlayout,     0, 16 )	/* colors 0-255 */
  	GFXDECODE_ENTRY( "gfx2", 0, spritelayout, 256, 16 )	/* colors 256-511 */
  GFXDECODE_END
  
  
  
  
  static MACHINE_DRIVER_START( gundealr )
  
  	/* basic machine hardware */
  	MDRV_CPU_ADD("maincpu", Z80, 8000000)	/* 8 MHz ??? */
  	MDRV_CPU_PROGRAM_MAP(main_map)
  	MDRV_CPU_IO_MAP(main_portmap)
  	MDRV_CPU_VBLANK_INT_HACK(yamyam_interrupt,4)	/* ? */
  
  	/* 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(32*8, 32*8)
  	MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
  
  	MDRV_GFXDECODE(gundealr)
  	MDRV_PALETTE_LENGTH(512)
  
  	MDRV_VIDEO_START(gundealr)
  	MDRV_VIDEO_UPDATE(gundealr)
  
  	/* sound hardware */
  	MDRV_SPEAKER_STANDARD_MONO("mono")
  
  	MDRV_SOUND_ADD("ym", YM2203, 1500000)
  	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
  MACHINE_DRIVER_END
  
  
  
  /***************************************************************************
  
    Game driver(s)
  
  ***************************************************************************/
  
  ROM_START( gundealr )
  	ROM_REGION( 0x30000, "maincpu", 0 )	/* 64k for code + 128k for banks */
  	ROM_LOAD( "gundealr.1",   0x00000, 0x10000, CRC(5797e830) SHA1(54bd9fbcafdf3fff55d73ecfe26d8e8df0dd55d9) )
  	ROM_RELOAD(               0x10000, 0x10000 )	/* banked at 0x8000-0xbfff */
  
  	ROM_REGION( 0x10000, "gfx1", 0 )
  	ROM_LOAD( "3.6p",         0x00000, 0x10000, CRC(01f99de2) SHA1(2d9e9c50b0669811beb6fa53c0ff1b240fa939c7) )
  
  	ROM_REGION( 0x20000, "gfx2", 0 )
  	ROM_LOAD( "gundealr.2",   0x00000, 0x20000, CRC(7874ec41) SHA1(2d2ff013cc37ce5966aa4b6c6724234655196102) )
  ROM_END
  
  ROM_START( gundealra )
  	ROM_REGION( 0x30000, "maincpu", 0 )	/* 64k for code + 128k for banks */
  	ROM_LOAD( "gundeala.1",   0x00000, 0x10000, CRC(d87e24f1) SHA1(5ac3e20e5848b9cab2a23e083d2566bfd54502d4) )
  	ROM_RELOAD(               0x10000, 0x10000 )	/* banked at 0x8000-0xbfff */
  
  	ROM_REGION( 0x10000, "gfx1", 0 )
  	ROM_LOAD( "gundeala.3",   0x00000, 0x10000, CRC(836cf1a3) SHA1(ca57e7fc3e4497d249af963d1c8610e80ca65aa7) )
  
  	ROM_REGION( 0x20000, "gfx2", 0 )
  	ROM_LOAD( "gundeala.2",   0x00000, 0x20000, CRC(4b5fb53c) SHA1(3b73d9aeed334aece75f551f5b7f3cec0aedbfaa) )
  ROM_END
  
  ROM_START( gundealrt )
  	ROM_REGION( 0x30000, "maincpu", 0 )	/* 64k for code + 128k for banks */
  	ROM_LOAD( "1.3j",         0x00000, 0x10000, CRC(1d951292) SHA1(a8bd34dfaf31c7dc4f9e0ec1fd7d4e10c5b29a85) )
  	ROM_RELOAD(               0x10000, 0x10000 )	/* banked at 0x8000-0xbfff */
  
  	ROM_REGION( 0x10000, "gfx1", 0 )
  	ROM_LOAD( "3.6p",         0x00000, 0x10000, CRC(01f99de2) SHA1(2d9e9c50b0669811beb6fa53c0ff1b240fa939c7) )
  
  	ROM_REGION( 0x20000, "gfx2", 0 )
  	ROM_LOAD( "2.6b",         0x00000, 0x20000, CRC(508ed0d0) SHA1(ea6b2d07e2e3d4f6c2a622a73b150ee7709b28de) )
  ROM_END
  
  ROM_START( yamyam )
  	ROM_REGION( 0x30000, "maincpu", 0 )	/* 64k for code + 128k for banks */
  	ROM_LOAD( "b3.f10",       0x00000, 0x20000, CRC(96ae9088) SHA1(a605882dcdcf1e8cf8b0112f614e696d59acfd97) )
  	ROM_RELOAD(               0x10000, 0x20000 )	/* banked at 0x8000-0xbfff */
  
  	ROM_REGION( 0x10000, "gfx1", 0 )
  	ROM_LOAD( "b2.d16",       0x00000, 0x10000, CRC(cb4f84ee) SHA1(54319ecbd74b763757eb6d17c8f7be0705ab0714) )
  
  	ROM_REGION( 0x20000, "gfx2", 0 )
  	ROM_LOAD( "b1.a16",       0x00000, 0x20000, CRC(b122828d) SHA1(90994ba548893a2eacdd58351cfa3952f4af926a) )
  ROM_END
  
  /* only gfx are different, code is the same */
  ROM_START( wiseguy )
  	ROM_REGION( 0x30000, "maincpu", 0 )	/* 64k for code + 128k for banks */
  	ROM_LOAD( "b3.f10",       0x00000, 0x20000, CRC(96ae9088) SHA1(a605882dcdcf1e8cf8b0112f614e696d59acfd97) )
  	ROM_RELOAD(               0x10000, 0x20000 )	/* banked at 0x8000-0xbfff */
  
  	ROM_REGION( 0x10000, "gfx1", 0 )
  	ROM_LOAD( "wguyb2.bin",   0x00000, 0x10000, CRC(1c684c46) SHA1(041bc500e31b02a8bf3ce4683a67de998f938ccc) )
  
  	ROM_REGION( 0x20000, "gfx2", 0 )
  	ROM_LOAD( "b1.a16",       0x00000, 0x20000, CRC(b122828d) SHA1(90994ba548893a2eacdd58351cfa3952f4af926a) )
  ROM_END
  
  
  
  static DRIVER_INIT( gundealr )
  {
  	input_ports_hack = 0;
  }
  
  static DRIVER_INIT( yamyam )
  {
  	input_ports_hack = 1;
  	memory_install_write8_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xe000, 0xe000, 0, 0, yamyam_protection_w);
  }
  
  
  
  GAME( 1990, gundealr, 0,        gundealr, gundealr, gundealr, ROT270, "Dooyong", "Gun Dealer", 0 )
  GAME( 19??, gundealra,gundealr, gundealr, gundealr, gundealr, ROT270, "Dooyong", "Gun Dealer (Alt Card Set)", 0 )
  GAME( 1990, gundealrt,gundealr, gundealr, gundealt, gundealr, ROT270, "Tecmo",   "Gun Dealer (Korea)", 0 )
  GAME( 1990, yamyam,   0,        gundealr, yamyam,   yamyam,   ROT0,   "Dooyong", "Yam! Yam!?", 0 )
  GAME( 1990, wiseguy,  yamyam,   gundealr, yamyam,   yamyam,   ROT0,   "Dooyong", "Wise Guy", 0 )
  