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/*===================================================================*/
/* */
/* Mapper 50 (Pirates) */
/* */
/*===================================================================*/
BYTE Map50_IRQ_Enable;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 50 */
/*-------------------------------------------------------------------*/
void Map50_Init()
{
/* Initialize Mapper */
MapperInit = Map50_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map50_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map50_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = ROMPAGE( 15 % ( NesHeader.byRomSize << 1 ) );
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 8 % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( 9 % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( 0 % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( 11 % ( NesHeader.byRomSize << 1 ) );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( int nPage = 0; nPage < 8; ++nPage )
{
PPUBANK[ nPage ] = VROMPAGE( nPage );
}
InfoNES_SetupChr();
}
/* Initialize IRQ Registers */
Map50_IRQ_Enable = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 50 Write to Apu Function */
/*-------------------------------------------------------------------*/
void Map50_Apu( WORD wAddr, BYTE byData )
{
if ( ( wAddr & 0xE060 ) == 0x4020 )
{
if( wAddr & 0x0100 )
{
Map50_IRQ_Enable = byData & 0x01;
}
else
{
BYTE byDummy;
byDummy = ( byData & 0x08 ) | ( ( byData & 0x01 ) << 2 ) | ( ( byData & 0x06 ) >> 1 );
ROMBANK2 = ROMPAGE( byDummy % ( NesHeader.byRomSize << 1 ) );
}
}
}
/*-------------------------------------------------------------------*/
/* Mapper 50 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map50_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map50_IRQ_Enable )
{
if ( PPU_Scanline == 21 )
{
IRQ_REQ;
}
}
}
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