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/*===================================================================*/
/* */
/* Mapper 255 : 110-in-1 */
/* */
/*===================================================================*/
BYTE Map255_Reg[4];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 255 */
/*-------------------------------------------------------------------*/
void Map255_Init()
{
/* Initialize Mapper */
MapperInit = Map255_Init;
/* Write to Mapper */
MapperWrite = Map255_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map255_Apu;
/* Read from APU */
MapperReadApu = Map255_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 ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set Registers */
InfoNES_Mirroring( 1 );
Map255_Reg[0] = 0;
Map255_Reg[1] = 0;
Map255_Reg[2] = 0;
Map255_Reg[3] = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 255 Write Function */
/*-------------------------------------------------------------------*/
void Map255_Write( WORD wAddr, BYTE byData )
{
BYTE byPrg = (wAddr & 0x0F80)>>7;
int nChr = (wAddr & 0x003F);
int nBank = (wAddr & 0x4000)>>14;
if( wAddr & 0x2000 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
if( wAddr & 0x1000 ) {
if( wAddr & 0x0040 ) {
ROMBANK0 = ROMPAGE((0x80*nBank+byPrg*4+2) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((0x80*nBank+byPrg*4+3) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((0x80*nBank+byPrg*4+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((0x80*nBank+byPrg*4+3) % (NesHeader.byRomSize<<1));
} else {
ROMBANK0 = ROMPAGE((0x80*nBank+byPrg*4+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((0x80*nBank+byPrg*4+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((0x80*nBank+byPrg*4+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((0x80*nBank+byPrg*4+1) % (NesHeader.byRomSize<<1));
}
} else {
ROMBANK0 = ROMPAGE((0x80*nBank+byPrg*4+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((0x80*nBank+byPrg*4+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((0x80*nBank+byPrg*4+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((0x80*nBank+byPrg*4+3) % (NesHeader.byRomSize<<1));
}
PPUBANK[ 0 ] = VROMPAGE((0x200*nBank+nChr*8+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE((0x200*nBank+nChr*8+1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE((0x200*nBank+nChr*8+2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE((0x200*nBank+nChr*8+3) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE((0x200*nBank+nChr*8+4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE((0x200*nBank+nChr*8+5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE((0x200*nBank+nChr*8+6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE((0x200*nBank+nChr*8+7) % (NesHeader.byVRomSize<<3));
}
/*-------------------------------------------------------------------*/
/* Mapper 255 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map255_Apu( WORD wAddr, BYTE byData )
{
if( wAddr >= 0x5800 ) {
Map255_Reg[wAddr&0x0003] = byData & 0x0F;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 255 Read from APU Function */
/*-------------------------------------------------------------------*/
BYTE Map255_ReadApu( WORD wAddr )
{
if( wAddr >= 0x5800 ) {
return Map255_Reg[wAddr&0x0003] & 0x0F;
} else {
return wAddr>>8;
}
}
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