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/*===================================================================*/
/* */
/* Mapper 89 (Sunsoft) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 89 */
/*-------------------------------------------------------------------*/
void Map89_Init()
{
/* Initialize Mapper */
MapperInit = Map89_Init;
/* Write to Mapper */
MapperWrite = Map89_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 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 89 Write Function */
/*-------------------------------------------------------------------*/
void Map89_Write( WORD wAddr, BYTE byData )
{
if ( ( wAddr & 0xFF00 ) == 0xC000 )
{
BYTE byPrgBank = (byData & 0x70) >> 4;
BYTE byChrBank = ((byData & 0x80) >> 4) | (byData & 0x07);
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( (byPrgBank*2+0) % (NesHeader.byRomSize << 1) );
ROMBANK1 = ROMPAGE( (byPrgBank*2+1) % (NesHeader.byRomSize << 1) );
PPUBANK[ 0 ] = VROMPAGE( (byChrBank*8+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 1 ] = VROMPAGE( (byChrBank*8+1) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 2 ] = VROMPAGE( (byChrBank*8+2) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 3 ] = VROMPAGE( (byChrBank*8+3) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 4 ] = VROMPAGE( (byChrBank*8+4) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 5 ] = VROMPAGE( (byChrBank*8+5) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 6 ] = VROMPAGE( (byChrBank*8+6) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 7 ] = VROMPAGE( (byChrBank*8+7) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
if ( byData & 0x08 )
{
InfoNES_Mirroring( 2 );
}
else
{
InfoNES_Mirroring( 3 );
}
}
}
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