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/*===================================================================*/
/* */
/* Mapper 116 : CartSaint : Yuu Yuu AV Kyoretsuden */
/* */
/*===================================================================*/
BYTE Map116_Reg[8];
BYTE Map116_Prg0, Map116_Prg1, Map116_Prg2, Map116_Prg3;
BYTE Map116_Prg0L, Map116_Prg1L;
BYTE Map116_Chr0, Map116_Chr1, Map116_Chr2, Map116_Chr3;
BYTE Map116_Chr4, Map116_Chr5, Map116_Chr6, Map116_Chr7;
BYTE Map116_IRQ_Enable;
BYTE Map116_IRQ_Counter;
BYTE Map116_IRQ_Latch;
BYTE Map116_ExPrgSwitch;
BYTE Map116_ExChrSwitch;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 116 */
/*-------------------------------------------------------------------*/
void Map116_Init()
{
/* Initialize Mapper */
MapperInit = Map116_Init;
/* Write to Mapper */
MapperWrite = Map116_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map116_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Initialize Registers */
for( int i = 0; i < 8; i++ ) {
Map116_Reg[i] = 0x00;
}
Map116_Prg0 = Map116_Prg0L = 0;
Map116_Prg1 = Map116_Prg1L = 1;
Map116_Prg2 = ( NesHeader.byRomSize << 1 ) - 2;
Map116_Prg3 = ( NesHeader.byRomSize << 1 ) - 1;
Map116_ExPrgSwitch = 0;
Map116_ExChrSwitch = 0;
/* Set ROM Banks */
Map116_Set_CPU_Banks();
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 ) {
Map116_Chr0 = 0;
Map116_Chr1 = 1;
Map116_Chr2 = 2;
Map116_Chr3 = 3;
Map116_Chr4 = 4;
Map116_Chr5 = 5;
Map116_Chr6 = 6;
Map116_Chr7 = 7;
Map116_Set_PPU_Banks();
} else {
Map116_Chr0 = Map116_Chr2 = Map116_Chr4 = Map116_Chr5 = Map116_Chr6 = Map116_Chr7 = 0;
Map116_Chr1 = Map116_Chr3 = 1;
}
Map116_IRQ_Enable = 0; /* Disable */
Map116_IRQ_Counter = 0;
Map116_IRQ_Latch = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 116 Write Function */
/*-------------------------------------------------------------------*/
void Map116_Write( WORD wAddr, BYTE byData )
{
switch( wAddr & 0xE001 ) {
case 0x8000:
Map116_Reg[0] = byData;
Map116_Set_CPU_Banks();
Map116_Set_PPU_Banks();
break;
case 0x8001:
Map116_Reg[1] = byData;
switch( Map116_Reg[0] & 0x07 ) {
case 0x00:
Map116_Chr0 = byData & 0xFE;
Map116_Chr1 = Map116_Chr0+1;
Map116_Set_PPU_Banks();
break;
case 0x01:
Map116_Chr2 = byData & 0xFE;
Map116_Chr3 = Map116_Chr2+1;
Map116_Set_PPU_Banks();
break;
case 0x02:
Map116_Chr4 = byData;
Map116_Set_PPU_Banks();
break;
case 0x03:
Map116_Chr5 = byData;
Map116_Set_PPU_Banks();
break;
case 0x04:
Map116_Chr6 = byData;
Map116_Set_PPU_Banks();
break;
case 0x05:
Map116_Chr7 = byData;
Map116_Set_PPU_Banks();
break;
case 0x06:
Map116_Prg0 = byData;
Map116_Set_CPU_Banks();
break;
case 0x07:
Map116_Prg1 = byData;
Map116_Set_CPU_Banks();
break;
}
break;
case 0xA000:
Map116_Reg[2] = byData;
if ( !ROM_FourScr ) {
if( byData & 0x01 ) InfoNES_Mirroring( 0 );
else InfoNES_Mirroring( 1 );
}
break;
case 0xA001:
Map116_Reg[3] = byData;
break;
case 0xC000:
Map116_Reg[4] = byData;
Map116_IRQ_Counter = byData;
Map116_IRQ_Enable = 0xFF;
break;
case 0xC001:
Map116_Reg[5] = byData;
Map116_IRQ_Latch = byData;
break;
case 0xE000:
Map116_Reg[6] = byData;
Map116_IRQ_Enable = 0;
break;
case 0xE001:
Map116_Reg[7] = byData;
Map116_IRQ_Enable = 0xFF;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 116 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map116_HSync()
{
if( ( /* PPU_Scanline >= 0 && */ PPU_Scanline <= 239) ) {
if( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP ) {
if( Map116_IRQ_Enable ) {
if( !(Map116_IRQ_Counter--) ) {
Map116_IRQ_Counter = Map116_IRQ_Latch;
IRQ_REQ;
}
}
}
}
}
/*-------------------------------------------------------------------*/
/* Mapper 116 Set CPU Banks Function */
/*-------------------------------------------------------------------*/
void Map116_Set_CPU_Banks()
{
if( Map116_Reg[0] & 0x40 ) {
ROMBANK0 = ROMPAGE( ( NesHeader.byRomSize << 1 ) - 2 );
ROMBANK1 = ROMPAGE( Map116_Prg1 % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( Map116_Prg0 % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ( NesHeader.byRomSize << 1 ) - 1 );
} else {
ROMBANK0 = ROMPAGE( Map116_Prg0 % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( Map116_Prg1 % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ( NesHeader.byRomSize << 1 ) - 2 );
ROMBANK3 = ROMPAGE( ( NesHeader.byRomSize << 1 ) - 1 );
}
}
/*-------------------------------------------------------------------*/
/* Mapper 116 Set PPU Banks Function */
/*-------------------------------------------------------------------*/
void Map116_Set_PPU_Banks()
{
if ( NesHeader.byVRomSize > 0 ) {
if( Map116_Reg[0] & 0x80 ) {
PPUBANK[ 0 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr7) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr3) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
} else {
PPUBANK[ 0 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr3) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE( ((Map116_ExChrSwitch<<8)+Map116_Chr7) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
}
}
}
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