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/*===================================================================*/
/* */
/* Mapper 187 : Street Fighter Zero 2 97 */
/* */
/*===================================================================*/
BYTE Map187_Prg[4];
int Map187_Chr[8];
BYTE Map187_Bank[8];
BYTE Map187_ExtMode;
BYTE Map187_ChrMode;
BYTE Map187_ExtEnable;
BYTE Map187_IRQ_Enable;
BYTE Map187_IRQ_Counter;
BYTE Map187_IRQ_Latch;
BYTE Map187_IRQ_Occur;
BYTE Map187_LastWrite;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 187 */
/*-------------------------------------------------------------------*/
void Map187_Init()
{
/* Initialize Mapper */
MapperInit = Map187_Init;
/* Write to Mapper */
MapperWrite = Map187_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map187_Apu;
/* Read from APU */
MapperReadApu = Map187_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map187_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set Registers */
for( int i = 0; i < 8; i++ ) {
Map187_Chr[i] = 0x00;
Map187_Bank[i] = 0x00;
}
/* Set ROM Banks */
Map187_Prg[0] = (NesHeader.byRomSize<<1)-4;
Map187_Prg[1] = (NesHeader.byRomSize<<1)-3;
Map187_Prg[2] = (NesHeader.byRomSize<<1)-2;
Map187_Prg[3] = (NesHeader.byRomSize<<1)-1;
Map187_Set_CPU_Banks();
Map187_ExtMode = 0;
Map187_ChrMode = 0;
Map187_ExtEnable = 0;
Map187_IRQ_Enable = 0;
Map187_IRQ_Counter = 0;
Map187_IRQ_Latch = 0;
Map187_LastWrite = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 187 Write Function */
/*-------------------------------------------------------------------*/
void Map187_Write( WORD wAddr, BYTE byData )
{
Map187_LastWrite = byData;
switch( wAddr ) {
case 0x8003:
Map187_ExtEnable = 0xFF;
Map187_ChrMode = byData;
if( (byData&0xF0) == 0 ) {
Map187_Prg[2] = (NesHeader.byRomSize<<1)-2;
Map187_Set_CPU_Banks();
}
break;
case 0x8000:
Map187_ExtEnable = 0;
Map187_ChrMode = byData;
break;
case 0x8001:
if( !Map187_ExtEnable ) {
switch( Map187_ChrMode & 7 ) {
case 0:
byData &= 0xFE;
Map187_Chr[4] = (int)byData+0x100;
Map187_Chr[5] = (int)byData+0x100+1;
Map187_Set_PPU_Banks();
break;
case 1:
byData &= 0xFE;
Map187_Chr[6] = (int)byData+0x100;
Map187_Chr[7] = (int)byData+0x100+1;
Map187_Set_PPU_Banks();
break;
case 2:
Map187_Chr[0] = byData;
Map187_Set_PPU_Banks();
break;
case 3:
Map187_Chr[1] = byData;
Map187_Set_PPU_Banks();
break;
case 4:
Map187_Chr[2] = byData;
Map187_Set_PPU_Banks();
break;
case 5:
Map187_Chr[3] = byData;
Map187_Set_PPU_Banks();
break;
case 6:
if( (Map187_ExtMode&0xA0)!=0xA0 ) {
Map187_Prg[0] = byData;
Map187_Set_CPU_Banks();
}
break;
case 7:
if( (Map187_ExtMode&0xA0)!=0xA0 ) {
Map187_Prg[1] = byData;
Map187_Set_CPU_Banks();
}
break;
default:
break;
}
} else {
switch( Map187_ChrMode ) {
case 0x2A:
Map187_Prg[1] = 0x0F;
break;
case 0x28:
Map187_Prg[2] = 0x17;
break;
case 0x26:
break;
default:
break;
}
Map187_Set_CPU_Banks();
}
Map187_Bank[Map187_ChrMode&7] = byData;
break;
case 0xA000:
if( byData & 0x01 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
break;
case 0xA001:
break;
case 0xC000:
Map187_IRQ_Counter = byData;
Map187_IRQ_Occur = 0;
break;
case 0xC001:
Map187_IRQ_Latch = byData;
Map187_IRQ_Occur = 0;
break;
case 0xE000:
case 0xE002:
Map187_IRQ_Enable = 0;
Map187_IRQ_Occur = 0;
break;
case 0xE001:
case 0xE003:
Map187_IRQ_Enable = 1;
Map187_IRQ_Occur = 0;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 187 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map187_Apu( WORD wAddr, BYTE byData )
{
Map187_LastWrite = byData;
if( wAddr == 0x5000 ) {
Map187_ExtMode = byData;
if( byData & 0x80 ) {
if( byData & 0x20 ) {
Map187_Prg[0] = ((byData&0x1E)<<1)+0;
Map187_Prg[1] = ((byData&0x1E)<<1)+1;
Map187_Prg[2] = ((byData&0x1E)<<1)+2;
Map187_Prg[3] = ((byData&0x1E)<<1)+3;
} else {
Map187_Prg[2] = ((byData&0x1F)<<1)+0;
Map187_Prg[3] = ((byData&0x1F)<<1)+1;
}
} else {
Map187_Prg[0] = Map187_Bank[6];
Map187_Prg[1] = Map187_Bank[7];
Map187_Prg[2] = (NesHeader.byRomSize<<1)-2;
Map187_Prg[3] = (NesHeader.byRomSize<<1)-1;
}
Map187_Set_CPU_Banks();
}
}
/*-------------------------------------------------------------------*/
/* Mapper 187 Read from APU Function */
/*-------------------------------------------------------------------*/
BYTE Map187_ReadApu( WORD wAddr )
{
switch( Map187_LastWrite&0x03 ) {
case 0:
return 0x83;
case 1:
return 0x83;
case 2:
return 0x42;
case 3:
return 0x00;
}
return 0;
}
/*-------------------------------------------------------------------*/
/* Mapper 187 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map187_HSync()
{
if( ( /* PPU_Scanline >= 0 && */ PPU_Scanline <= 239) ) {
if( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP ) {
if( Map187_IRQ_Enable ) {
if( !Map187_IRQ_Counter ) {
Map187_IRQ_Counter--;
Map187_IRQ_Enable = 0;
Map187_IRQ_Occur = 0xFF;
} else {
Map187_IRQ_Counter--;
}
}
}
}
if ( Map187_IRQ_Occur ) {
IRQ_REQ;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 187 Set CPU Banks Function */
/*-------------------------------------------------------------------*/
void Map187_Set_CPU_Banks()
{
ROMBANK0 = ROMPAGE(((Map187_Prg[0]<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((Map187_Prg[1]<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((Map187_Prg[2]<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((Map187_Prg[3]<<2)+3) % (NesHeader.byRomSize<<1));
}
/*-------------------------------------------------------------------*/
/* Mapper 187 Set PPU Banks Function */
/*-------------------------------------------------------------------*/
void Map187_Set_PPU_Banks()
{
PPUBANK[ 0 ] = VROMPAGE(((Map187_Chr[0]<<3)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE(((Map187_Chr[1]<<3)+1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE(((Map187_Chr[2]<<3)+2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE(((Map187_Chr[3]<<3)+3) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE(((Map187_Chr[4]<<3)+4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE(((Map187_Chr[5]<<3)+5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE(((Map187_Chr[6]<<3)+6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE(((Map187_Chr[7]<<3)+7) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
}
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