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/*===================================================================*/
/* */
/* Mapper 228 : Action 52 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 228 */
/*-------------------------------------------------------------------*/
void Map228_Init()
{
/* Initialize Mapper */
MapperInit = Map228_Init;
/* Write to Mapper */
MapperWrite = Map228_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 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 228 Write Function */
/*-------------------------------------------------------------------*/
void Map228_Write( WORD wAddr, BYTE byData )
{
BYTE byPrg = (wAddr&0x0780)>>7;
switch( (wAddr&0x1800)>>11 ) {
case 1:
byPrg |= 0x10;
break;
case 3:
byPrg |= 0x20;
break;
}
if( wAddr & 0x0020 ) {
byPrg <<= 1;
if( wAddr & 0x0040 ) {
byPrg++;
}
ROMBANK0 = ROMPAGE(((byPrg<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byPrg<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byPrg<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byPrg<<2)+1) % (NesHeader.byRomSize<<1));
} else {
ROMBANK0 = ROMPAGE(((byPrg<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byPrg<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byPrg<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byPrg<<2)+3) % (NesHeader.byRomSize<<1));
}
BYTE byChr = ((wAddr&0x000F)<<2)|(byData&0x03);
PPUBANK[ 0 ] = VROMPAGE(((byChr<<3)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE(((byChr<<3)+1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE(((byChr<<3)+2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE(((byChr<<3)+3) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE(((byChr<<3)+4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE(((byChr<<3)+5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE(((byChr<<3)+6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE(((byChr<<3)+7) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
if( wAddr & 0x2000 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
}
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