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/*===================================================================*/
/* */
/* Mapper 246 : Phone Serm Berm */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 246 */
/*-------------------------------------------------------------------*/
void Map246_Init()
{
/* Initialize Mapper */
MapperInit = Map246_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map246_Sram;
/* Write to APU */
MapperApu = Map0_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 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 246 Write to SRAM Function */
/*-------------------------------------------------------------------*/
void Map246_Sram( WORD wAddr, BYTE byData )
{
if( wAddr>=0x6000 && wAddr<0x8000 ) {
switch( wAddr ) {
case 0x6000:
ROMBANK0 = ROMPAGE(((byData<<2)+0) % (NesHeader.byRomSize<<1));
break;
case 0x6001:
ROMBANK1 = ROMPAGE(((byData<<2)+1) % (NesHeader.byRomSize<<1));
break;
case 0x6002:
ROMBANK2 = ROMPAGE(((byData<<2)+2) % (NesHeader.byRomSize<<1));
break;
case 0x6003:
ROMBANK3 = ROMPAGE(((byData<<2)+3) % (NesHeader.byRomSize<<1));
break;
case 0x6004:
PPUBANK[ 0 ] = VROMPAGE(((byData<<1)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE(((byData<<1)+1) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
break;
case 0x6005:
PPUBANK[ 2 ] = VROMPAGE(((byData<<1)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE(((byData<<1)+1) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
break;
case 0x6006:
PPUBANK[ 4 ] = VROMPAGE(((byData<<1)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE(((byData<<1)+1) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
break;
case 0x6007:
PPUBANK[ 6 ] = VROMPAGE(((byData<<1)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE(((byData<<1)+1) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
break;
default:
SRAMBANK[wAddr&0x1FFF] = byData;
break;
}
}
}
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