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/*===================================================================*/
/* */
/* Mapper 66 (GNROM) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 66 */
/*-------------------------------------------------------------------*/
void Map66_Init()
{
int nPage;
/* Initialize Mapper */
MapperInit = Map66_Init;
/* Write to Mapper */
MapperWrite = Map66_Write;
/* Write to SRAM */
MapperSram = Map66_Write;
/* 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 PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 0 );
}
/*-------------------------------------------------------------------*/
/* Mapper 66 Write Function */
/*-------------------------------------------------------------------*/
void Map66_Write( WORD wAddr, BYTE byData )
{
BYTE byRom;
BYTE byVRom;
byRom = ( byData >> 4 ) & 0x0F;
byVRom = byData & 0x0F;
/* Set ROM Banks */
byRom <<= 1;
byRom %= NesHeader.byRomSize;
byRom <<= 1;
ROMBANK0 = ROMPAGE( byRom );
ROMBANK1 = ROMPAGE( byRom + 1 );
ROMBANK2 = ROMPAGE( byRom + 2 );
ROMBANK3 = ROMPAGE( byRom + 3 );
/* Set PPU Banks */
byVRom <<= 3;
byVRom %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byVRom );
PPUBANK[ 1 ] = VROMPAGE( byVRom + 1 );
PPUBANK[ 2 ] = VROMPAGE( byVRom + 2 );
PPUBANK[ 3 ] = VROMPAGE( byVRom + 3 );
PPUBANK[ 4 ] = VROMPAGE( byVRom + 4 );
PPUBANK[ 5 ] = VROMPAGE( byVRom + 5 );
PPUBANK[ 6 ] = VROMPAGE( byVRom + 6 );
PPUBANK[ 7 ] = VROMPAGE( byVRom + 7 );
InfoNES_SetupChr();
}
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