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/*===================================================================*/
/* */
/* Mapper 3 (VROM Switch) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 3 */
/*-------------------------------------------------------------------*/
void Map3_Init()
{
int nPage;
/* Initialize Mapper */
MapperInit = Map3_Init;
/* Write to Mapper */
MapperWrite = Map3_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 */
if ( ( NesHeader.byRomSize << 1 ) > 2 )
{
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 2 );
ROMBANK3 = ROMPAGE( 3 );
} else {
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 0 );
ROMBANK3 = ROMPAGE( 1 );
}
/* 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 */
/* "DragonQuest" doesn't run if IRQ isn't made to occur in CLI */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 3 Write Function */
/*-------------------------------------------------------------------*/
void Map3_Write( WORD wAddr, BYTE byData )
{
DWORD dwBase;
/* Set PPU Banks */
byData %= NesHeader.byVRomSize;
dwBase = ( (DWORD)byData ) << 3;
PPUBANK[ 0 ] = VROMPAGE( dwBase + 0 );
PPUBANK[ 1 ] = VROMPAGE( dwBase + 1 );
PPUBANK[ 2 ] = VROMPAGE( dwBase + 2 );
PPUBANK[ 3 ] = VROMPAGE( dwBase + 3 );
PPUBANK[ 4 ] = VROMPAGE( dwBase + 4 );
PPUBANK[ 5 ] = VROMPAGE( dwBase + 5 );
PPUBANK[ 6 ] = VROMPAGE( dwBase + 6 );
PPUBANK[ 7 ] = VROMPAGE( dwBase + 7 );
InfoNES_SetupChr();
}
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