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/*===================================================================*/
/* */
/* Mapper 243 (Pirates) */
/* */
/*===================================================================*/
BYTE Map243_Regs[4];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 243 */
/*-------------------------------------------------------------------*/
void Map243_Init()
{
/* Initialize Mapper */
MapperInit = Map243_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map243_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();
}
/* Initialize state registers */
Map243_Regs[0] = Map243_Regs[1] = Map243_Regs[2] = Map243_Regs[3] = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 243 Write to Apu Function */
/*-------------------------------------------------------------------*/
void Map243_Apu( WORD wAddr, BYTE byData )
{
if ( wAddr == 0x4100 )
{
Map243_Regs[0] = byData;
}
else if ( wAddr == 0x4101 )
{
switch ( Map243_Regs[0] & 0x07 )
{
case 0x02:
Map243_Regs[1] = byData & 0x01;
break;
case 0x00:
case 0x04:
case 0x07:
Map243_Regs[2] = ( byData & 0x01 ) << 1;
break;
/* Set ROM Banks */
case 0x05:
ROMBANK0 = ROMPAGE( ( byData * 4 + 0 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( ( byData * 4 + 1 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ( byData * 4 + 2 ) % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ( byData * 4 + 3 ) % ( NesHeader.byRomSize << 1 ) );
break;
case 0x06:
Map243_Regs[3] = ( byData & 0x03 ) << 2;
break;
}
/* Set PPU Banks */
if ( ( NesHeader.byVRomSize << 3 ) <= 64 )
{
BYTE chr_bank = ( Map243_Regs[2] + Map243_Regs[3] ) >> 1;
PPUBANK[ 0 ] = VROMPAGE( ( chr_bank * 8 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( chr_bank * 8 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 2 ] = VROMPAGE( ( chr_bank * 8 + 2 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( chr_bank * 8 + 3 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 4 ] = VROMPAGE( ( chr_bank * 8 + 4 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 5 ] = VROMPAGE( ( chr_bank * 8 + 5 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 6 ] = VROMPAGE( ( chr_bank * 8 + 6 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 7 ] = VROMPAGE( ( chr_bank * 8 + 7 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
}
else
{
BYTE chr_bank = Map243_Regs[1] + Map243_Regs[2] + Map243_Regs[3];
PPUBANK[ 0 ] = VROMPAGE( ( chr_bank * 8 + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( chr_bank * 8 + 1 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 2 ] = VROMPAGE( ( chr_bank * 8 + 2 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( chr_bank * 8 + 3 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 4 ] = VROMPAGE( ( chr_bank * 8 + 4 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 5 ] = VROMPAGE( ( chr_bank * 8 + 5 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 6 ] = VROMPAGE( ( chr_bank * 8 + 6 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 7 ] = VROMPAGE( ( chr_bank * 8 + 7 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
}
}
}
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