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/*===================================================================*/
/* */
/* Mapper 85 (Konami VRC7) */
/* */
/*===================================================================*/
BYTE Map85_Chr_Ram[ 0x100 * 0x400 ];
BYTE Map85_Regs[ 1 ];
BYTE Map85_IRQ_Enable;
BYTE Map85_IRQ_Cnt;
BYTE Map85_IRQ_Latch;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 85 */
/*-------------------------------------------------------------------*/
void Map85_Init()
{
/* Initialize Mapper */
MapperInit = Map85_Init;
/* Write to Mapper */
MapperWrite = Map85_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 = Map85_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 */
PPUBANK[ 0 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 1 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 2 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 3 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 4 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 5 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 6 ] = Map85_VROMPAGE( 0 );
PPUBANK[ 7 ] = Map85_VROMPAGE( 0 );
InfoNES_SetupChr();
/* Initialize State Registers */
Map85_Regs[ 0 ] = 0;
Map85_IRQ_Enable = 0;
Map85_IRQ_Cnt = 0;
Map85_IRQ_Latch = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 85 Write Function */
/*-------------------------------------------------------------------*/
void Map85_Write( WORD wAddr, BYTE byData )
{
switch( wAddr & 0xf030 )
{
case 0x8000:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
break;
case 0x8010:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK1 = ROMPAGE( byData );
break;
case 0x9000:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK2 = ROMPAGE( byData );
break;
case 0x9010:
case 0x9030:
/* Extra Sound */
case 0xa000:
PPUBANK[ 0 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xa010:
PPUBANK[ 1 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xb000:
PPUBANK[ 2 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xb010:
PPUBANK[ 3 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xc000:
PPUBANK[ 4 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xc010:
PPUBANK[ 5 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xd000:
PPUBANK[ 6 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0xd010:
PPUBANK[ 7 ] = Map85_VROMPAGE( byData );
InfoNES_SetupChr();
break;
/* Name Table Mirroring */
case 0xe000:
switch ( byData & 0x03 )
{
case 0x00:
InfoNES_Mirroring( 1 );
break;
case 0x01:
InfoNES_Mirroring( 0 );
break;
case 0x02:
InfoNES_Mirroring( 3 );
break;
case 0x03:
InfoNES_Mirroring( 2 );
break;
}
break;
case 0xe010:
Map85_IRQ_Latch = 0xff - byData;
break;
case 0xf000:
Map85_Regs[ 0 ] = byData & 0x01;
Map85_IRQ_Enable = ( byData & 0x02 ) >> 1;
Map85_IRQ_Cnt = Map85_IRQ_Latch;
break;
case 0xf010:
Map85_IRQ_Enable = Map85_Regs[ 0 ];
Map85_IRQ_Cnt = Map85_IRQ_Latch;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 85 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map85_HSync()
{
if ( Map85_IRQ_Enable )
{
if ( Map85_IRQ_Cnt == 0 )
{
IRQ_REQ;
Map85_IRQ_Enable = 0;
} else {
Map85_IRQ_Cnt--;
}
}
}
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