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/*===================================================================*/
/* */
/* Mapper 189 (Pirates) */
/* */
/*===================================================================*/
BYTE Map189_Regs[ 1 ];
BYTE Map189_IRQ_Cnt;
BYTE Map189_IRQ_Latch;
BYTE Map189_IRQ_Enable;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 189 */
/*-------------------------------------------------------------------*/
void Map189_Init()
{
/* Initialize Mapper */
MapperInit = Map189_Init;
/* Write to Mapper */
MapperWrite = Map189_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map189_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map189_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 = 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 */
Map189_IRQ_Cnt = 0;
Map189_IRQ_Latch = 0;
Map189_IRQ_Enable = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 189 Write to Apu Function */
/*-------------------------------------------------------------------*/
void Map189_Apu( WORD wAddr, BYTE byData )
{
if ( wAddr >= 0x4100 && wAddr <= 0x41FF )
{
byData = ( byData & 0x30 ) >> 4;
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 ) );
}
}
/*-------------------------------------------------------------------*/
/* Mapper 189 Write Function */
/*-------------------------------------------------------------------*/
void Map189_Write( WORD wAddr, BYTE byData )
{
/* Set ROM Banks */
switch( wAddr )
{
case 0x8000:
Map189_Regs[0] = byData;
break;
case 0x8001:
switch( Map189_Regs[0] )
{
case 0x40:
PPUBANK[ 0 ] = VROMPAGE( ( byData + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( byData + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x41:
PPUBANK[ 2 ] = VROMPAGE( ( byData + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( byData + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x42:
PPUBANK[ 4 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x43:
PPUBANK[ 5 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x44:
PPUBANK[ 6 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x45:
PPUBANK[ 7 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x46:
ROMBANK2 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
case 0x47:
ROMBANK1 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
}
break;
case 0xC000:
Map189_IRQ_Cnt = byData;
break;
case 0xC001:
Map189_IRQ_Latch = byData;
break;
case 0xE000:
Map189_IRQ_Enable = 0;
break;
case 0xE001:
Map189_IRQ_Enable = 1;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 189 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map189_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map189_IRQ_Enable )
{
if ( /* 0 <= PPU_Scanline && */ PPU_Scanline <= 239 )
{
if ( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP )
{
if ( !( --Map189_IRQ_Cnt ) )
{
Map189_IRQ_Cnt = Map189_IRQ_Latch;
IRQ_REQ;
}
}
}
}
}
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