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/*===================================================================*/
/* */
/* Mapper 17 (FFE F8 Series) */
/* */
/*===================================================================*/
BYTE Map17_IRQ_Enable;
DWORD Map17_IRQ_Cnt;
DWORD Map17_IRQ_Latch;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 17 */
/*-------------------------------------------------------------------*/
void Map17_Init()
{
int nPage;
/* Initialize Mapper */
MapperInit = Map17_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map17_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map17_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 )
{
for ( nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Initialize State Registers */
Map17_IRQ_Enable = 0;
Map17_IRQ_Cnt = 0;
Map17_IRQ_Latch = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 17 Write to APU Function */
/*-------------------------------------------------------------------*/
void Map17_Apu( WORD wAddr, BYTE byData )
{
switch ( wAddr )
{
case 0x42fe:
if ( ( byData & 0x10 ) == 0 )
{
InfoNES_Mirroring( 3 );
} else {
InfoNES_Mirroring( 2 );
}
break;
case 0x42ff:
if ( ( byData & 0x10 ) == 0 )
{
InfoNES_Mirroring( 1 );
} else {
InfoNES_Mirroring( 0 );
}
break;
case 0x4501:
Map17_IRQ_Enable = 0;
break;
case 0x4502:
Map17_IRQ_Latch = ( Map17_IRQ_Latch & 0xff00 ) | byData;
break;
case 0x4503:
Map17_IRQ_Latch = ( Map17_IRQ_Latch & 0x00ff ) | ( (DWORD)byData << 8 );
Map17_IRQ_Cnt = Map17_IRQ_Latch;
Map17_IRQ_Enable = 1;
break;
case 0x4504:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
break;
case 0x4505:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK1 = ROMPAGE( byData );
break;
case 0x4506:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK2 = ROMPAGE( byData );
break;
case 0x4507:
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK3 = ROMPAGE( byData );
break;
case 0x4510:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4511:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 1 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4512:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 2 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4513:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 3 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4514:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 4 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4515:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 5 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4516:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 6 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
case 0x4517:
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 7 ] = VROMPAGE( byData );
InfoNES_SetupChr();
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 17 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map17_HSync()
{
if ( Map17_IRQ_Enable )
{
if ( Map17_IRQ_Cnt >= 0xffff - 113 )
{
IRQ_REQ;
Map17_IRQ_Cnt = 0;
Map17_IRQ_Enable = 0;
} else {
Map17_IRQ_Cnt += 113;
}
}
}
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