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/*===================================================================*/
/* */
/* Mapper 57 */
/* */
/*===================================================================*/
BYTE Map57_Reg;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 57 */
/*-------------------------------------------------------------------*/
void Map57_Init()
{
/* Initialize Mapper */
MapperInit = Map57_Init;
/* Write to Mapper */
MapperWrite = Map57_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( 0 );
ROMBANK3 = ROMPAGE( 1 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 ) {
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set Registers */
Map57_Reg = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 57 Write Function */
/*-------------------------------------------------------------------*/
void Map57_Write( WORD wAddr, BYTE byData )
{
BYTE byChr;
switch( wAddr ) {
case 0x8000:
case 0x8001:
case 0x8002:
case 0x8003:
if( byData & 0x40 ) {
byChr = (byData&0x03)+((Map57_Reg&0x10)>>1)+(Map57_Reg&0x07);
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();
}
break;
case 0x8800:
Map57_Reg = byData;
if( byData & 0x80 ) {
ROMBANK0 = ROMPAGE((((byData & 0x40)>>6)*4+8+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((((byData & 0x40)>>6)*4+8+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((byData & 0x40)>>6)*4+8+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((byData & 0x40)>>6)*4+8+3) % (NesHeader.byRomSize<<1));
} else {
ROMBANK0 = ROMPAGE((((byData & 0x60)>>5)*2+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((((byData & 0x60)>>5)*2+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((byData & 0x60)>>5)*2+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((byData & 0x60)>>5)*2+1) % (NesHeader.byRomSize<<1));
}
byChr = (byData&0x07)+((byData&0x10)>>1);
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( byData & 0x08 ) InfoNES_Mirroring( 0 );
else InfoNES_Mirroring( 1 );
break;
}
}
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