nemesis.c

这个是延伸mame的在wince平台下的游戏模拟器的代码

/***************************************************************************
	Nemesis preliminary :

	0x00000 - 0x3ffff       ROM

	0x40000 - 0x4ffff	character RAM + Obj ram

	scroll value is the same for every line in nemesis
	0x50000 - 0x501ff	scroll index per line layer 1 (low byte)
	0x50200 - 0x503ff	scroll index per line layer 1 (hi byte)
	0x50400 - 0x505ff	scroll index per line layer 2 (low byte)
	0x50600 - 0x507ff	scroll index per line layer 2 (hi byte)

	0x50800 - 0x50fff	??????

	0x52000 - 0x52fff       screen RAM 1
	0x53000 - 0x53fff       screen RAM 2

	0x54000 - 0x54fff	color ram 1
	0x55000 - 0x55fff	color ram 2

	0x56000 - 0x56fff       sprite RAM

	0x5c401
	0x5c403

	0x5cc01
	0x5cc03

	0x5cc05
	0x5cc07

	0x5c801			(watchdog ???)

	0x5a000 - 0x5afff       pallette RAM

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

#include "driver.h"
#include "vidhrdw/generic.h"

static unsigned char *ram;

extern unsigned char *nemesis_videoram1;
extern unsigned char *nemesis_videoram2;
extern unsigned char *nemesis_characterram;
extern unsigned char *nemesis_xscroll1,*nemesis_xscroll2, *nemesis_yscroll;
extern int  nemesis_characterram_size;

int  nemesis_videoram1_r(int offset);
void nemesis_videoram1_w(int offset,int data);
int  nemesis_videoram2_r(int offset);
void nemesis_videoram2_w(int offset,int data);
int  nemesis_characterram_r(int offset);
void nemesis_characterram_w(int offset,int data);
void nemesis_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
int  nemesis_vh_start(void);
void nemesis_vh_stop(void);

void salamand_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void nemesis_init_machine(void);



int irq_on = 0;
int irq1_on = 0;
int irq2_on = 0;
int irq4_on = 0;


void nemesis_init_machine(void)
{
	irq_on = 0;
	irq1_on = 0;
	irq2_on = 0;
	irq4_on = 0;
}



int nemesis_interrupt(void)
{
	if (irq_on) return 1;

	return 0;
}


int konamigt_interrupt(void)
{
	if (cpu_getiloops() == 0)
	{
		if (irq_on)	return 1;
	}
	else
	{
		if (irq2_on) return 2;
	}

	return 0;
}


int gx400_interrupt(void)
{
	switch (cpu_getiloops())
	{
		case 0:
			if (irq1_on) return 1;
			break;

		case 1:
			if (irq2_on) return 2;
			break;

		case 2:
			if (irq4_on) return 4;
			break;
	}

	return 0;
}

void gx400_irq1_enable_w(int offset,int data)
{
	if ((data & 0x00ff0000) == 0)
		irq1_on = data & 0x0001;
}

void gx400_irq2_enable_w(int offset,int data)
{
	if ((data & 0x00ff0000) == 0)
		irq2_on = data & 0x0001;
}

void gx400_irq4_enable_w(int offset,int data)
{
	if ((data & 0xff000000) == 0)
		irq4_on = data & 0x0100;
}

static unsigned char *gx400_shared_ram;


int gx400_sharedram_nosoundfix_r(int offset)
{
	return 2;
}

int gx400_sharedram_r(int offset)
{
	return gx400_shared_ram[offset / 2];
}

void gx400_sharedram_w(int offset,int data)
{
	gx400_shared_ram[offset / 2] = data;
}



int salamand_interrupt(void)
{
	if (irq_on)
		return(1);
	else
		return(0);
}

void nemesis_irq_enable_w(int offset,int data)
{
	irq_on = data & 0xff;
}

void konamigt_irq_enable_w(int offset,int data)
{
	if ((data & 0x00ff0000) == 0)
	{
		irq_on = data & 0xff;
	}
}
void konamigt_irq2_enable_w(int offset,int data)
{
	if ((data & 0x00ff0000) == 0)
	{
		irq2_on = data & 0xff;
	}
}

int konamigt_input_r(int offset)
{
	int data=readinputport(1);
	int data2=readinputport(6);

	int ret=0;

	if(data&0x10) ret|=0x0800;			
	if(data&0x80) ret|=0x0400;			
	if(data&0x20) ret|=0x0300;			

	if(data&0x40) ret|=0xf000;			

	ret|=data2&0x7f;					

	return ret;
}

void nemesis_soundlatch_w (int offset, int data)
{
	soundlatch_w(offset,data & 0xff);

	/* the IRQ should probably be generated by 5e004, but we'll handle it here for now */
	cpu_cause_interrupt(1,0xff);
}

static int nemesis_portA_r(int offset)
{
	#define TIMER_RATE 1024

	return cpu_gettotalcycles() / TIMER_RATE;
}



static struct MemoryReadAddress readmem[] =
{
	{ 0x000000, 0x03ffff, MRA_ROM },
	{ 0x040000, 0x04ffff, nemesis_characterram_r },
	{ 0x050000, 0x0503ff, MRA_BANK1 },
	{ 0x050400, 0x0507ff, MRA_BANK2 },
	{ 0x050800, 0x050bff, MRA_BANK3 },
	{ 0x050c00, 0x050fff, MRA_BANK4 },

	{ 0x052000, 0x053fff, nemesis_videoram1_r },
	{ 0x054000, 0x055fff, nemesis_videoram2_r },
	{ 0x056000, 0x056fff, MRA_BANK5 },
	{ 0x05a000, 0x05afff, paletteram_word_r },

	{ 0x05c400, 0x05c401, input_port_4_r },	/* DSW0 */
	{ 0x05c402, 0x05c403, input_port_5_r },	/* DSW1 */

	{ 0x05cc00, 0x05cc01, input_port_0_r },	/* IN0 */
	{ 0x05cc02, 0x05cc03, input_port_1_r },	/* IN1 */
	{ 0x05cc04, 0x05cc05, input_port_2_r },	/* IN2 */
	{ 0x05cc06, 0x05cc07, input_port_3_r },	/* TEST */

	{ 0x060000, 0x067fff, MRA_BANK6 },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress writemem[] =
{
	{ 0x000000, 0x03ffff, MWA_ROM },	/* ROM */

	{ 0x040000, 0x04ffff, nemesis_characterram_w, &nemesis_characterram, &nemesis_characterram_size },

	{ 0x050000, 0x0503ff, MWA_BANK1, &nemesis_xscroll1 },
	{ 0x050400, 0x0507ff, MWA_BANK2, &nemesis_xscroll2 },
	{ 0x050800, 0x050bff, MWA_BANK3 },
	{ 0x050c00, 0x050fff, MWA_BANK4, &nemesis_yscroll },
	{ 0x051000, 0x051fff, MWA_NOP },		/* used, but written to with 0's */

	{ 0x052000, 0x053fff, nemesis_videoram1_w, &nemesis_videoram1 },	/* VRAM 1 */
	{ 0x054000, 0x055fff, nemesis_videoram2_w, &nemesis_videoram2 },	/* VRAM 2 */
	{ 0x056000, 0x056fff, MWA_BANK5, &spriteram, &spriteram_size },
	{ 0x05a000, 0x05afff, paletteram_xBBBBBGGGGGRRRRR_word_w, &paletteram },

	{ 0x05c000, 0x05c001, nemesis_soundlatch_w },
	{ 0x05c800, 0x05c801, watchdog_reset_w },	/* probably */

	{ 0x05e000, 0x05e001, &nemesis_irq_enable_w },	/* Nemesis */
	{ 0x05e002, 0x05e003, &nemesis_irq_enable_w },	/* Konami GT */
	{ 0x05e004, 0x05e005, MWA_NOP},	/* bit 8 of the word probably triggers IRQ on sound board */
	{ 0x060000, 0x067fff, MWA_BANK6, &ram },	/* WORK RAM */
	{ -1 }  /* end of table */
};

static struct MemoryReadAddress sound_readmem[] =
{
	{ 0x0000, 0x3fff, MRA_ROM },
	{ 0x4000, 0x47ff, MRA_RAM },
	{ 0xe001, 0xe001, soundlatch_r },
	{ 0xe086, 0xe086, AY8910_read_port_0_r },
	{ 0xe205, 0xe205, AY8910_read_port_1_r },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress sound_writemem[] =
{
	{ 0x0000, 0x3fff, MWA_ROM },
	{ 0x4000, 0x47ff, MWA_RAM },
	{ 0xe006, 0xe006, AY8910_control_port_0_w },
	{ 0xe106, 0xe106, AY8910_write_port_0_w },
	{ 0xe005, 0xe005, AY8910_control_port_1_w },
	{ 0xe405, 0xe405, AY8910_write_port_1_w },
	{ -1 }  /* end of table */
};


static struct MemoryReadAddress konamigt_readmem[] =
{
	{ 0x000000, 0x03ffff, MRA_ROM },
	{ 0x040000, 0x04ffff, nemesis_characterram_r },
	{ 0x050000, 0x0503ff, MRA_BANK1 },
	{ 0x050400, 0x0507ff, MRA_BANK2 },
	{ 0x050800, 0x050bff, MRA_BANK3 },
	{ 0x050c00, 0x050fff, MRA_BANK4 },

	{ 0x052000, 0x053fff, nemesis_videoram1_r },
	{ 0x054000, 0x055fff, nemesis_videoram2_r },
	{ 0x056000, 0x056fff, MRA_BANK5 },
	{ 0x05a000, 0x05afff, paletteram_word_r },

	{ 0x05c400, 0x05c401, input_port_4_r },	/* DSW0 */
	{ 0x05c402, 0x05c403, input_port_5_r },	/* DSW1 */

	{ 0x05cc00, 0x05cc01, input_port_0_r },	/* IN0 */
	{ 0x05cc02, 0x05cc03, input_port_1_r },	/* IN1 */
	{ 0x05cc04, 0x05cc05, input_port_2_r },	/* IN2 */
	{ 0x05cc06, 0x05cc07, input_port_3_r },	/* TEST */

	{ 0x060000, 0x067fff, MRA_BANK6 },
	{ 0x070000, 0x070001, konamigt_input_r },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress konamigt_writemem[] =
{
	{ 0x000000, 0x03ffff, MWA_ROM },	/* ROM */

	{ 0x040000, 0x04ffff, nemesis_characterram_w, &nemesis_characterram, &nemesis_characterram_size },

	{ 0x050000, 0x0503ff, MWA_BANK1, &nemesis_xscroll1 },
	{ 0x050400, 0x0507ff, MWA_BANK2, &nemesis_xscroll2 },
	{ 0x050800, 0x050bff, MWA_BANK3 },
	{ 0x050c00, 0x050fff, MWA_BANK4, &nemesis_yscroll },
	{ 0x051000, 0x051fff, MWA_NOP },		/* used, but written to with 0's */

	{ 0x052000, 0x053fff, nemesis_videoram1_w, &nemesis_videoram1 },	/* VRAM 1 */
	{ 0x054000, 0x055fff, nemesis_videoram2_w, &nemesis_videoram2 },	/* VRAM 2 */
	{ 0x056000, 0x056fff, MWA_BANK5, &spriteram, &spriteram_size },
	{ 0x05a000, 0x05afff, paletteram_xBBBBBGGGGGRRRRR_word_w, &paletteram },

	{ 0x05c000, 0x05c001, nemesis_soundlatch_w },
	{ 0x05c800, 0x05c801, watchdog_reset_w },	/* probably */

	{ 0x05e000, 0x05e001, &konamigt_irq2_enable_w },
	{ 0x05e002, 0x05e003, &konamigt_irq_enable_w },
	{ 0x05e004, 0x05e005, MWA_NOP},	/* bit 8 of the word probably triggers IRQ on sound board */
	{ 0x060000, 0x067fff, MWA_BANK6, &ram },	/* WORK RAM */
	{ -1 }  /* end of table */
};


static struct MemoryReadAddress gx400_readmem[] =
{
	{ 0x000000, 0x00ffff, MRA_ROM },
	{ 0x010000, 0x01ffff, MRA_RAM },
	{ 0x020000, 0x027ff9, gx400_sharedram_r },
	{ 0x027ffa, 0x027fff, gx400_sharedram_nosoundfix_r },
	{ 0x030000, 0x03ffff, nemesis_characterram_r },
	{ 0x050000, 0x0503ff, MRA_RAM },
	{ 0x050400, 0x0507ff, MRA_RAM },
	{ 0x050800, 0x050bff, MRA_RAM },
	{ 0x050c00, 0x050fff, MRA_RAM },
	{ 0x052000, 0x053fff, nemesis_videoram1_r },
	{ 0x054000, 0x055fff, nemesis_videoram2_r },
	{ 0x056000, 0x056fff, MRA_RAM },
	{ 0x057000, 0x057fff, MRA_RAM },
	{ 0x05a000, 0x05afff, paletteram_word_r },
	{ 0x05c402, 0x05c403, input_port_4_r },	/* DSW0 */