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/*===================================================================*/
/* */
/* Mapper 15 (100-in-1) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 15 */
/*-------------------------------------------------------------------*/
void Map15_Init()
{
/* Initialize Mapper */
MapperInit = Map15_Init;
/* Write to Mapper */
MapperWrite = Map15_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 = 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 );
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 15 Write Function */
/*-------------------------------------------------------------------*/
void Map15_Write( WORD wAddr, BYTE byData )
{
BYTE byBank;
switch ( wAddr )
{
case 0x8000:
/* Name Table Mirroring */
InfoNES_Mirroring( byData & 0x20 ? 0 : 1);
/* Set ROM Banks */
byBank = byData & 0x1f;
byBank %= ( NesHeader.byRomSize << 1 );
byBank <<= 1;
ROMBANK0 = ROMPAGE( byBank );
ROMBANK1 = ROMPAGE( byBank + 1 );
ROMBANK2 = ROMPAGE( byBank + 2 );
ROMBANK3 = ROMPAGE( byBank + 3 );
break;
case 0x8001:
/* Set ROM Banks */
byData &= 0x3f;
byData %= ( NesHeader.byRomSize << 1 );
byData <<= 1;
ROMBANK2 = ROMPAGE( byData );
ROMBANK3 = ROMPAGE( byData + 1 );
break;
case 0x8002:
/* Set ROM Banks */
byBank = byData & 0x3f;
byBank %= ( NesHeader.byRomSize << 1 );
byBank <<= 1;
byBank += ( byData & 0x80 ? 1 : 0 );
ROMBANK0 = ROMPAGE( byBank );
ROMBANK1 = ROMPAGE( byBank );
ROMBANK2 = ROMPAGE( byBank );
ROMBANK3 = ROMPAGE( byBank );
break;
case 0x8003:
/* Name Table Mirroring */
InfoNES_Mirroring( byData & 0x20 ? 0 : 1);
/* Set ROM Banks */
byData &= 0x1f;
byData %= ( NesHeader.byRomSize << 1 );
byData <<= 1;
ROMBANK2 = ROMPAGE( byData );
ROMBANK3 = ROMPAGE( byData + 1 );
break;
}
}
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