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/*===================================================================*/
/* */
/* Mapper 43 (SMB2J) */
/* */
/*===================================================================*/
DWORD Map43_IRQ_Cnt;
BYTE Map43_IRQ_Enable;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 43 */
/*-------------------------------------------------------------------*/
void Map43_Init()
{
/* Initialize Mapper */
MapperInit = Map43_Init;
/* Write to Mapper */
MapperWrite = Map43_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map43_Apu;
/* Read from APU */
MapperReadApu = Map43_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map43_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = ROMPAGE( 2 );
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 1 );
ROMBANK1 = ROMPAGE( 0 );
ROMBANK2 = ROMPAGE( 4 );
ROMBANK3 = ROMPAGE( 9 );
/* Initialize State Registers */
Map43_IRQ_Enable = 1;
Map43_IRQ_Cnt = 0;
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 43 Read from APU Function */
/*-------------------------------------------------------------------*/
BYTE Map43_ReadApu( WORD wAddr )
{
if ( 0x5000 <= wAddr && wAddr < 0x6000 )
{
return ROM[ 0x2000*8 + 0x1000 + (wAddr - 0x5000) ];
}
return (BYTE)(wAddr >> 8);
}
/*-------------------------------------------------------------------*/
/* Mapper 43 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map43_Apu( WORD wAddr, BYTE byData )
{
if( (wAddr&0xF0FF) == 0x4022 )
{
switch( byData&0x07 )
{
case 0x00:
case 0x02:
case 0x03:
case 0x04:
ROMBANK2 = ROMPAGE( 4 );
break;
case 0x01:
ROMBANK2 = ROMPAGE( 3 );
break;
case 0x05:
ROMBANK2 = ROMPAGE( 7 );
break;
case 0x06:
ROMBANK2 = ROMPAGE( 5 );
break;
case 0x07:
ROMBANK2 = ROMPAGE( 6 );
break;
}
}
}
/*-------------------------------------------------------------------*/
/* Mapper 43 Write Function */
/*-------------------------------------------------------------------*/
void Map43_Write( WORD wAddr, BYTE byData )
{
if( wAddr == 0x8122 ) {
if( byData&0x03 ) {
Map43_IRQ_Enable = 1;
} else {
Map43_IRQ_Cnt = 0;
Map43_IRQ_Enable = 0;
}
}
}
/*-------------------------------------------------------------------*/
/* Mapper 43 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map43_HSync()
{
if( Map43_IRQ_Enable )
{
Map43_IRQ_Cnt += 114;
if( Map43_IRQ_Cnt >= 4096 ) {
Map43_IRQ_Cnt -= 4096;
IRQ_REQ;
}
}
}
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