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/*===================================================================*/
/* */
/* Mapper 83 (Pirates) */
/* */
/*===================================================================*/
BYTE Map83_Regs[3];
DWORD Map83_Chr_Bank;
DWORD Map83_IRQ_Cnt;
BYTE Map83_IRQ_Enabled;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 83 */
/*-------------------------------------------------------------------*/
void Map83_Init()
{
/* Initialize Mapper */
MapperInit = Map83_Init;
/* Write to Mapper */
MapperWrite = Map83_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map83_Apu;
/* Read from APU */
MapperReadApu = Map83_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map83_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Initialize Registers */
Map83_Regs[0] = Map83_Regs[1] = Map83_Regs[2] = 0;
/* Set ROM Banks */
if ( ( NesHeader.byRomSize << 1 ) >= 32 )
{
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 30 );
ROMBANK3 = ROMPAGE( 31 );
Map83_Regs[ 1 ] = 0x30;
}
else
{
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();
}
/* Initialize IRQ Registers */
Map83_IRQ_Enabled = 0;
Map83_IRQ_Cnt = 0;
Map83_Chr_Bank = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 83 Read from APU Function */
/*-------------------------------------------------------------------*/
BYTE Map83_ReadApu( WORD wAddr )
{
if ( ( wAddr & 0x5100 ) == 0x5100 )
{
return Map83_Regs[2];
}
else
{
return wAddr >> 8;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 83 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map83_Apu( WORD wAddr, BYTE byData )
{
switch(wAddr)
{
case 0x5101:
case 0x5102:
case 0x5103:
Map83_Regs[2] = byData;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 83 Write Function */
/*-------------------------------------------------------------------*/
void Map83_Write( WORD wAddr, BYTE byData )
{
/* Set ROM Banks */
switch( wAddr )
{
case 0x8000:
case 0xB000:
case 0xB0FF:
case 0xB1FF:
Map83_Regs[0] = byData;
Map83_Chr_Bank = (byData & 0x30) << 4;
ROMBANK0 = ROMPAGE( (byData*2+0) % (NesHeader.byRomSize << 1) );
ROMBANK1 = ROMPAGE( (byData*2+1) % (NesHeader.byRomSize << 1) );
ROMBANK2 = ROMPAGE( (((byData&0x30)|0x0F)*2+0) % (NesHeader.byRomSize << 1) );
ROMBANK3 = ROMPAGE( (((byData&0x30)|0x0F)*2+1) % (NesHeader.byRomSize << 1) );
break;
case 0x8100:
if ( NesHeader.byVRomSize <= 32 )
{
Map83_Regs[1] = byData;
}
if ((byData & 0x03) == 0x00)
{
InfoNES_Mirroring( 1 );
}
else if((byData & 0x03) == 0x01)
{
InfoNES_Mirroring( 0 );
}
else if((byData & 0x03) == 0x02)
{
InfoNES_Mirroring( 3 );
}
else
{
InfoNES_Mirroring( 2 );
}
break;
case 0x8200:
Map83_IRQ_Cnt = ( Map83_IRQ_Cnt & 0xFF00 ) | (DWORD)byData;
break;
case 0x8201:
Map83_IRQ_Cnt = ( Map83_IRQ_Cnt & 0x00FF ) | ((DWORD)byData << 8);
Map83_IRQ_Enabled = byData;
break;
case 0x8300:
ROMBANK0 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0x8301:
ROMBANK1 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0x8302:
ROMBANK2 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0x8310:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 0 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 0 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 1 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8311:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 1 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 2 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 3 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8312:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 2 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 4 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 5 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8313:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 3 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 6 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 7 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8314:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 4 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 4 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 5 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8315:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 5 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if ((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 6 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 7 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8316:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 6 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if ((Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 4 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 5 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8317:
if ((Map83_Regs[1] & 0x30) == 0x30)
{
PPUBANK[ 7 ] = VROMPAGE( (Map83_Chr_Bank^byData) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
else if ( (Map83_Regs[1] & 0x30) == 0x10 || (Map83_Regs[1] & 0x30) == 0x20)
{
PPUBANK[ 6 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+0) % (NesHeader.byVRomSize << 3) );
PPUBANK[ 7 ] = VROMPAGE( (((Map83_Chr_Bank^byData)*2)+1) % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
}
break;
case 0x8318:
ROMBANK0 = ROMPAGE( (((Map83_Regs[0]&0x30)|byData)*2+0) % (NesHeader.byRomSize << 1) );
ROMBANK1 = ROMPAGE( (((Map83_Regs[0]&0x30)|byData)*2+1) % (NesHeader.byRomSize << 1) );
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 83 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map83_HSync()
{
if (Map83_IRQ_Enabled)
{
if (Map83_IRQ_Cnt <= 114)
{
IRQ_REQ;
Map83_IRQ_Enabled = 0;
}
else
{
Map83_IRQ_Cnt -= 114;
}
}
}
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