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/*===================================================================*/
/* */
/* Mapper 182 (Pirates) */
/* */
/*===================================================================*/
BYTE Map182_Regs[1];
BYTE Map182_IRQ_Enable;
BYTE Map182_IRQ_Cnt;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 182 */
/*-------------------------------------------------------------------*/
void Map182_Init()
{
/* Initialize Mapper */
MapperInit = Map182_Init;
/* Write to Mapper */
MapperWrite = Map182_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 = Map182_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 */
Map182_Regs[0] = 0;
Map182_IRQ_Enable = 0;
Map182_IRQ_Cnt = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 182 Write Function */
/*-------------------------------------------------------------------*/
void Map182_Write( WORD wAddr, BYTE byData )
{
switch( wAddr & 0xF003 )
{
/* Name Table Mirroring */
case 0x8001:
if ( byData & 0x01 )
{
InfoNES_Mirroring( 0 ); /* Horizontal */
}
else
{
InfoNES_Mirroring( 1 ); /* Vertical */
}
break;
case 0xA000:
Map182_Regs[0] = byData & 0x07;
break;
case 0xC000:
switch( Map182_Regs[0] )
{
/* Set PPU Banks */
case 0x00:
PPUBANK[ 0 ] = VROMPAGE( ( ( byData & 0xFE ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( ( byData & 0xFE ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x01:
PPUBANK[ 5 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x02:
PPUBANK[ 2 ] = VROMPAGE( ( ( byData & 0xFE ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( ( byData & 0xFE ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x03:
PPUBANK[ 7 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
/* Set ROM Banks */
case 0x04:
ROMBANK0 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
case 0x05:
ROMBANK1 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
/* Set PPU Banks */
case 0x06:
PPUBANK[ 4 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x07:
PPUBANK[ 6 ] = VROMPAGE( byData % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
}
break;
case 0xE003:
Map182_IRQ_Cnt = byData;
Map182_IRQ_Enable = byData;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 182 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map182_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map182_IRQ_Enable )
{
if ( /* 0 <= PPU_Scanline && */ PPU_Scanline <= 240 )
{
if ( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP )
{
if ( !( --Map182_IRQ_Cnt ) )
{
Map182_IRQ_Cnt = 0;
Map182_IRQ_Enable = 0;
IRQ_REQ;
}
}
}
}
}
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