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/*===================================================================*/
/* */
/* Mapper 16 (Bandai Mapper) */
/* */
/*===================================================================*/
BYTE Map16_Regs[3];
BYTE Map16_IRQ_Enable;
DWORD Map16_IRQ_Cnt;
DWORD Map16_IRQ_Latch;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 16 */
/*-------------------------------------------------------------------*/
void Map16_Init()
{
/* Initialize Mapper */
MapperInit = Map16_Init;
/* Write to Mapper */
MapperWrite = Map16_Write;
/* Write to SRAM */
MapperSram = Map16_Write;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map16_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 );
/* Initialize State Flag */
Map16_Regs[ 0 ] = 0;
Map16_Regs[ 1 ] = 0;
Map16_Regs[ 2 ] = 0;
Map16_IRQ_Enable = 0;
Map16_IRQ_Cnt = 0;
Map16_IRQ_Latch = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 16 Write Function */
/*-------------------------------------------------------------------*/
void Map16_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr & 0x000f )
{
case 0x0000:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0001:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 1 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0002:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 2 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0003:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 3 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0004:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 4 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0005:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 5 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0006:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 6 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0007:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 7 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x0008:
byData <<= 1;
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
ROMBANK1 = ROMPAGE( byData + 1 );
break;
case 0x0009:
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 0x000a:
Map16_IRQ_Enable = byData & 0x01;
Map16_IRQ_Cnt = Map16_IRQ_Latch;
break;
case 0x000b:
Map16_IRQ_Latch = ( Map16_IRQ_Latch & 0xff00 ) | byData;
break;
case 0x000c:
Map16_IRQ_Latch = ( (DWORD)byData << 8 ) | ( Map16_IRQ_Latch & 0x00ff );
break;
case 0x000d:
/* Write Protect */
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 16 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map16_HSync()
{
if ( Map16_IRQ_Enable )
{
/* Normal IRQ */
if ( Map16_IRQ_Cnt <= 114 )
{
IRQ_REQ;
Map16_IRQ_Cnt = 0;
Map16_IRQ_Enable = 0;
} else {
Map16_IRQ_Cnt -= 114;
}
}
}
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