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/*===================================================================*/
/* */
/* Mapper 109 : SACHEN The Great Wall SA-019 */
/* */
/*===================================================================*/
BYTE Map109_Reg;
BYTE Map109_Chr0, Map109_Chr1, Map109_Chr2, Map109_Chr3;
BYTE Map109_Chrmode0, Map109_Chrmode1;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 109 */
/*-------------------------------------------------------------------*/
void Map109_Init()
{
/* Initialize Mapper */
MapperInit = Map109_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map109_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map0_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 2 );
ROMBANK3 = ROMPAGE( 3 );
/* Initialize Registers */
Map109_Reg = 0;
Map109_Chr0 = 0;
Map109_Chr1 = 0;
Map109_Chr2 = 0;
Map109_Chr3 = 0;
Map109_Chrmode0 = 0;
Map109_Chrmode1 = 0;
/* Set PPU Banks */
Map109_Set_PPU_Banks();
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 109 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map109_Apu( WORD wAddr, BYTE byData )
{
switch( wAddr ) {
case 0x4100:
Map109_Reg = byData;
break;
case 0x4101:
switch( Map109_Reg ) {
case 0:
Map109_Chr0 = byData;
Map109_Set_PPU_Banks();
break;
case 1:
Map109_Chr1 = byData;
Map109_Set_PPU_Banks();
break;
case 2:
Map109_Chr2 = byData;
Map109_Set_PPU_Banks();
break;
case 3:
Map109_Chr3 = byData;
Map109_Set_PPU_Banks();
break;
case 4:
Map109_Chrmode0 = byData & 0x01;
Map109_Set_PPU_Banks();
break;
case 5:
ROMBANK0 = ROMPAGE( ( ( byData & 0x07 ) + 0 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( ( ( byData & 0x07 ) + 1 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ( ( byData & 0x07 ) + 2 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ( ( byData & 0x07 ) + 3 ) % ( NesHeader.byRomSize << 1 ) );
break;
case 6:
Map109_Chrmode1 = byData & 0x07;
Map109_Set_PPU_Banks();
break;
case 7:
if( byData & 0x01 ) InfoNES_Mirroring( 0 );
else InfoNES_Mirroring( 1 );
break;
}
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 109 Set Bank PPU Function */
/*-------------------------------------------------------------------*/
void Map109_Set_PPU_Banks()
{
if ( NesHeader.byVRomSize > 0 ) {
PPUBANK[ 0 ] = VROMPAGE((Map109_Chr0) % (NesHeader.byVRomSize<<3) );
PPUBANK[ 1 ] = VROMPAGE((Map109_Chr1|((Map109_Chrmode1<<3)&0x8)) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE((Map109_Chr2|((Map109_Chrmode1<<2)&0x8)) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE((Map109_Chr3|((Map109_Chrmode1<<1)&0x8)|(Map109_Chrmode0*0x10)) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE((NesHeader.byVRomSize<<3)-4);
PPUBANK[ 5 ] = VROMPAGE((NesHeader.byVRomSize<<3)-3);
PPUBANK[ 6 ] = VROMPAGE((NesHeader.byVRomSize<<3)-2);
PPUBANK[ 7 ] = VROMPAGE((NesHeader.byVRomSize<<3)-1);
InfoNES_SetupChr();
}
}
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