📄 galaga.c
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/***************************************************************************
Galaga memory map (preliminary)
CPU #1:
0000-3fff ROM
CPU #2:
0000-1fff ROM
CPU #3:
0000-1fff ROM
ALL CPUS:
8000-83ff Video RAM
8400-87ff Color RAM
8b80-8bff sprite code/color
9380-93ff sprite position
9b80-9bff sprite control
8800-9fff RAM
read:
6800-6807 dip switches (only bits 0 and 1 are used - bit 0 is DSW1, bit 1 is DSW2)
dsw1:
bit 6-7 lives
bit 3-5 bonus
bit 0-2 coins per play
dsw2: (bootleg version, the original version is slightly different)
bit 7 cocktail/upright (1 = upright)
bit 6 ?
bit 5 RACK TEST
bit 4 pause (0 = paused, 1 = not paused)
bit 3 ?
bit 2 ?
bit 0-1 difficulty
7000- custom IO chip return values
7100 custom IO chip status ($10 = command executed)
write:
6805 sound voice 1 waveform (nibble)
6811-6813 sound voice 1 frequency (nibble)
6815 sound voice 1 volume (nibble)
680a sound voice 2 waveform (nibble)
6816-6818 sound voice 2 frequency (nibble)
681a sound voice 2 volume (nibble)
680f sound voice 3 waveform (nibble)
681b-681d sound voice 3 frequency (nibble)
681f sound voice 3 volume (nibble)
6820 cpu #1 irq acknowledge/enable
6821 cpu #2 irq acknowledge/enable
6822 cpu #3 nmi acknowledge/enable
6823 if 0, halt CPU #2 and #3
6830 Watchdog reset?
7000- custom IO chip parameters
7100 custom IO chip command (see machine/galaga.c for more details)
a000-a001 starfield scroll speed (only bit 0 is significant)
a002 starfield scroll direction (0 = backwards) (only bit 0 is significant)
a003-a004 starfield blink
a005 starfield enable
a007 flip screen
Interrupts:
CPU #1 IRQ mode 1
NMI is triggered by the custom IO chip to signal the CPU to read/write
parameters
CPU #2 IRQ mode 1
CPU #3 NMI (@120Hz)
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
extern unsigned char *galaga_sharedram;
int galaga_hiscore_print_r(int offset);
int galaga_sharedram_r(int offset);
void galaga_sharedram_w(int offset,int data);
int galaga_dsw_r(int offset);
void galaga_interrupt_enable_1_w(int offset,int data);
void galaga_interrupt_enable_2_w(int offset,int data);
void galaga_interrupt_enable_3_w(int offset,int data);
int galaga_customio_r(int offset);
int galaga_customio_data_r(int offset);
void galaga_customio_w(int offset,int data);
void galaga_customio_data_w(int offset,int data);
void galaga_halt_w(int offset,int data);
int galaga_interrupt_1(void);
int galaga_interrupt_2(void);
int galaga_interrupt_3(void);
void galaga_init_machine(void);
extern unsigned char *galaga_starcontrol;
void galaga_flipscreen_w(int offset,int data);
int galaga_vh_start(void);
void galaga_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void galaga_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom);
void pengo_sound_w(int offset,int data);
extern unsigned char *pengo_soundregs;
extern unsigned char galaga_hiscoreloaded;
static struct MemoryReadAddress readmem_cpu1[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_r, &galaga_sharedram },
{ 0x6800, 0x6807, galaga_dsw_r },
{ 0x7000, 0x700f, galaga_customio_data_r },
{ 0x7100, 0x7100, galaga_customio_r },
{ 0x02b9, 0x02bd, galaga_hiscore_print_r },
{ 0x0000, 0x3fff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryReadAddress readmem_cpu2[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_r },
{ 0x6800, 0x6807, galaga_dsw_r },
{ 0x0000, 0x1fff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryReadAddress readmem_cpu3[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_r },
{ 0x6800, 0x6807, galaga_dsw_r },
{ 0x0000, 0x1fff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem_cpu1[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_w },
{ 0x6830, 0x6830, MWA_NOP },
{ 0x7000, 0x700f, galaga_customio_data_w },
{ 0x7100, 0x7100, galaga_customio_w },
{ 0xa000, 0xa005, MWA_RAM, &galaga_starcontrol },
{ 0x6820, 0x6820, galaga_interrupt_enable_1_w },
{ 0x6822, 0x6822, galaga_interrupt_enable_3_w },
{ 0x6823, 0x6823, galaga_halt_w },
{ 0xa007, 0xa007, galaga_flipscreen_w },
{ 0x0000, 0x3fff, MWA_ROM },
{ 0x8b80, 0x8bff, MWA_RAM, &spriteram, &spriteram_size }, /* these three are here just to initialize */
{ 0x9380, 0x93ff, MWA_RAM, &spriteram_2 }, /* the pointers. The actual writes are */
{ 0x9b80, 0x9bff, MWA_RAM, &spriteram_3 }, /* handled by galaga_sharedram_w() */
{ 0x8000, 0x83ff, MWA_RAM, &videoram, &videoram_size }, /* dirtybuffer[] handling is not needed because */
{ 0x8400, 0x87ff, MWA_RAM, &colorram }, /* characters are redrawn every frame */
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem_cpu2[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_w },
{ 0x6821, 0x6821, galaga_interrupt_enable_2_w },
{ 0x0000, 0x1fff, MWA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem_cpu3[] =
{
{ 0x8000, 0x9fff, galaga_sharedram_w },
{ 0x6800, 0x681f, pengo_sound_w, &pengo_soundregs },
{ 0x6822, 0x6822, galaga_interrupt_enable_3_w },
{ 0x0000, 0x1fff, MWA_ROM },
{ -1 } /* end of table */
};
INPUT_PORTS_START( galaga_input_ports )
PORT_START /* DSW0 */
PORT_DIPNAME( 0x07, 0x07, "Coinage", IP_KEY_NONE )
PORT_DIPSETTING( 0x04, "4 Coins/1 Credit" )
PORT_DIPSETTING( 0x02, "3 Coins/1 Credit" )
PORT_DIPSETTING( 0x06, "2 Coins/1 Credit" )
PORT_DIPSETTING( 0x07, "1 Coin/1 Credit" )
PORT_DIPSETTING( 0x01, "2 Coins/3 Credits" )
PORT_DIPSETTING( 0x03, "1 Coin/2 Credits" )
PORT_DIPSETTING( 0x05, "1 Coin/3 Credits" )
PORT_DIPSETTING( 0x00, "Free Play" )
/* TODO: bonus scores are different for 5 lives */
PORT_DIPNAME( 0x38, 0x38, "Bonus Life", IP_KEY_NONE )
PORT_DIPSETTING( 0x20, "20K 60K 60K" )
PORT_DIPSETTING( 0x18, "20K 60K" )
PORT_DIPSETTING( 0x10, "20K 70K 70K" )
PORT_DIPSETTING( 0x30, "20K 80K 80K" )
PORT_DIPSETTING( 0x38, "30K 80K" )
PORT_DIPSETTING( 0x08, "30K 100K 100K" )
PORT_DIPSETTING( 0x28, "30K 120K 120K" )
PORT_DIPSETTING( 0x00, "None" )
PORT_DIPNAME( 0xc0, 0x80, "Lives", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "2" )
PORT_DIPSETTING( 0x80, "3" )
PORT_DIPSETTING( 0x40, "4" )
PORT_DIPSETTING( 0xc0, "5" )
PORT_START /* DSW1 */
PORT_DIPNAME( 0x01, 0x01, "2 Credits Game", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "1 Player" )
PORT_DIPSETTING( 0x01, "2 Players" )
PORT_DIPNAME( 0x06, 0x06, "Difficulty", IP_KEY_NONE )
PORT_DIPSETTING( 0x06, "Easy" )
PORT_DIPSETTING( 0x00, "Medium" )
PORT_DIPSETTING( 0x02, "Hard" )
PORT_DIPSETTING( 0x04, "Hardest" )
PORT_DIPNAME( 0x08, 0x00, "Demo Sounds", IP_KEY_NONE )
PORT_DIPSETTING( 0x08, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x10, 0x10, "Freeze", IP_KEY_NONE )
PORT_DIPSETTING( 0x10, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_BITX( 0x20, 0x20, IPT_DIPSWITCH_NAME | IPF_CHEAT, "Rack Test", OSD_KEY_F1, IP_JOY_NONE, 0 )
PORT_DIPSETTING( 0x20, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x40, 0x40, "Unknown", IP_KEY_NONE )
PORT_DIPSETTING( 0x40, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x80, 0x80, "Cabinet", IP_KEY_NONE )
PORT_DIPSETTING( 0x80, "Upright" )
PORT_DIPSETTING( 0x00, "Cocktail" )
PORT_START /* FAKE */
/* The player inputs are not memory mapped, they are handled by an I/O chip. */
/* These fake input ports are read by galaga_customio_data_r() */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_2WAY )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_2WAY )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_BUTTON1, 0, IP_KEY_PREVIOUS, IP_JOY_PREVIOUS, 0 )
PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START /* FAKE */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_2WAY | IPF_COCKTAIL )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_2WAY | IPF_COCKTAIL )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_IMPULSE | IPF_COCKTAIL,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_COCKTAIL, 0, IP_KEY_PREVIOUS, IP_JOY_PREVIOUS, 0 )
PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START /* FAKE */
/* the button here is used to trigger the sound in the test screen */
PORT_BITX(0x03, IP_ACTIVE_LOW, IPT_BUTTON1, 0, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 0 )
PORT_BITX(0x04, IP_ACTIVE_LOW, IPT_START1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x08, IP_ACTIVE_LOW, IPT_START2 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_COIN1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_COIN2 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x40, IP_ACTIVE_LOW, IPT_COIN3 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX( 0x80, 0x80, IPT_DIPSWITCH_NAME | IPF_TOGGLE, "Service Mode", OSD_KEY_F2, IP_JOY_NONE, 0 )
PORT_DIPSETTING( 0x80, "Off" )
PORT_DIPSETTING( 0x00, "On" )
INPUT_PORTS_END
/* same as galaga, dip switches are slightly different */
INPUT_PORTS_START( galaganm_input_ports )
PORT_START /* DSW0 */
PORT_DIPNAME( 0x07, 0x07, "Coinage", IP_KEY_NONE )
PORT_DIPSETTING( 0x04, "4 Coins/1 Credit" )
PORT_DIPSETTING( 0x02, "3 Coins/1 Credit" )
PORT_DIPSETTING( 0x06, "2 Coins/1 Credit" )
PORT_DIPSETTING( 0x07, "1 Coin/1 Credit" )
PORT_DIPSETTING( 0x01, "2 Coins/3 Credits" )
PORT_DIPSETTING( 0x03, "1 Coin/2 Credits" )
PORT_DIPSETTING( 0x05, "1 Coin/3 Credits" )
PORT_DIPSETTING( 0x00, "Free Play" )
/* TODO: bonus scores are different for 5 lives */
PORT_DIPNAME( 0x38, 0x38, "Bonus Life", IP_KEY_NONE )
PORT_DIPSETTING( 0x20, "20K 60K 60K" )
PORT_DIPSETTING( 0x18, "20K 60K" )
PORT_DIPSETTING( 0x10, "20K 70K 70K" )
PORT_DIPSETTING( 0x30, "20K 80K 80K" )
PORT_DIPSETTING( 0x38, "30K 80K" )
PORT_DIPSETTING( 0x08, "30K 100K 100K" )
PORT_DIPSETTING( 0x28, "30K 120K 120K" )
PORT_DIPSETTING( 0x00, "None" )
PORT_DIPNAME( 0xc0, 0x80, "Lives", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "2" )
PORT_DIPSETTING( 0x80, "3" )
PORT_DIPSETTING( 0x40, "4" )
PORT_DIPSETTING( 0xc0, "5" )
PORT_START /* DSW1 */
PORT_DIPNAME( 0x03, 0x03, "Difficulty", IP_KEY_NONE )
PORT_DIPSETTING( 0x03, "Easy" )
PORT_DIPSETTING( 0x00, "Medium" )
PORT_DIPSETTING( 0x01, "Hard" )
PORT_DIPSETTING( 0x02, "Hardest" )
PORT_DIPNAME( 0x04, 0x04, "Unknown 1", IP_KEY_NONE )
PORT_DIPSETTING( 0x04, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x08, 0x00, "Demo Sounds", IP_KEY_NONE )
PORT_DIPSETTING( 0x08, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x10, 0x10, "Freeze", IP_KEY_NONE )
PORT_DIPSETTING( 0x10, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_BITX( 0x20, 0x20, IPT_DIPSWITCH_NAME | IPF_CHEAT, "Rack Test", OSD_KEY_F1, IP_JOY_NONE, 0 )
PORT_DIPSETTING( 0x20, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x40, 0x40, "Unknown 2", IP_KEY_NONE )
PORT_DIPSETTING( 0x40, "Off" )
PORT_DIPSETTING( 0x00, "On" )
PORT_DIPNAME( 0x80, 0x80, "Cabinet", IP_KEY_NONE )
PORT_DIPSETTING( 0x80, "Upright" )
PORT_DIPSETTING( 0x00, "Cocktail" )
PORT_START /* FAKE */
/* The player inputs are not memory mapped, they are handled by an I/O chip. */
/* These fake input ports are read by galaga_customio_data_r() */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_2WAY )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_2WAY )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_BUTTON1, 0, IP_KEY_PREVIOUS, IP_JOY_PREVIOUS, 0 )
PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START /* FAKE */
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_2WAY | IPF_COCKTAIL )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_2WAY | IPF_COCKTAIL )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_IMPULSE | IPF_COCKTAIL,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_COCKTAIL, 0, IP_KEY_PREVIOUS, IP_JOY_PREVIOUS, 0 )
PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START /* FAKE */
/* the button here is used to trigger the sound in the test screen */
PORT_BITX(0x03, IP_ACTIVE_LOW, IPT_BUTTON1, 0, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 0 )
PORT_BITX(0x04, IP_ACTIVE_LOW, IPT_START1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x08, IP_ACTIVE_LOW, IPT_START2 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x10, IP_ACTIVE_LOW, IPT_COIN1 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x20, IP_ACTIVE_LOW, IPT_COIN2 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX(0x40, IP_ACTIVE_LOW, IPT_COIN3 | IPF_IMPULSE,
IP_NAME_DEFAULT, IP_KEY_DEFAULT, IP_JOY_DEFAULT, 1 )
PORT_BITX( 0x80, 0x80, IPT_DIPSWITCH_NAME | IPF_TOGGLE, "Service Mode", OSD_KEY_F2, IP_JOY_NONE, 0 )
PORT_DIPSETTING( 0x80, "Off" )
PORT_DIPSETTING( 0x00, "On" )
INPUT_PORTS_END
static struct GfxLayout charlayout =
{
8,8, /* 8*8 characters */
128, /* 128 characters */
2, /* 2 bits per pixel */
{ 0, 4 }, /* the two bitplanes for 4 pixels are packed into one byte */
{ 7*8, 6*8, 5*8, 4*8, 3*8, 2*8, 1*8, 0*8 }, /* characters are rotated 90 degrees */
{ 8*8+0, 8*8+1, 8*8+2, 8*8+3, 0, 1, 2, 3 }, /* bits are packed in groups of four */
16*8 /* every char takes 16 bytes */
};
static struct GfxLayout spritelayout =
{
16,16, /* 16*16 sprites */
128, /* 128 sprites */
2, /* 2 bits per pixel */
{ 0, 4 }, /* the two bitplanes for 4 pixels are packed into one byte */
{ 39 * 8, 38 * 8, 37 * 8, 36 * 8, 35 * 8, 34 * 8, 33 * 8, 32 * 8,
7 * 8, 6 * 8, 5 * 8, 4 * 8, 3 * 8, 2 * 8, 1 * 8, 0 * 8 },
{ 0, 1, 2, 3, 8*8, 8*8+1, 8*8+2, 8*8+3, 16*8+0, 16*8+1, 16*8+2, 16*8+3,
24*8+0, 24*8+1, 24*8+2, 24*8+3 },
64*8 /* every sprite takes 64 bytes */
};
static struct GfxDecodeInfo gfxdecodeinfo[] =
{
{ 1, 0x0000, &charlayout, 0, 32 },
{ 1, 0x1000, &spritelayout, 32*4, 32 },
{ -1 } /* end of array */
};
static struct namco_interface namco_interface =
{
3072000/32, /* sample rate */
3, /* number of voices */
32, /* gain adjustment */
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