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/*===================================================================*/
/* */
/* Mapper 183 : Gimmick (Bootleg) */
/* */
/*===================================================================*/
BYTE Map183_Reg[8];
BYTE Map183_IRQ_Enable;
int Map183_IRQ_Counter;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 183 */
/*-------------------------------------------------------------------*/
void Map183_Init()
{
/* Initialize Mapper */
MapperInit = Map183_Init;
/* Write to Mapper */
MapperWrite = Map183_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 = Map183_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 */
if ( NesHeader.byVRomSize > 0 ) {
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Initialize Registers */
for( int i = 0; i < 8; i++ ) {
Map183_Reg[i] = i;
}
Map183_IRQ_Enable = 0;
Map183_IRQ_Counter = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 183 Write Function */
/*-------------------------------------------------------------------*/
void Map183_Write( WORD wAddr, BYTE byData )
{
switch( wAddr ) {
case 0x8800:
ROMBANK0 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0xA800:
ROMBANK1 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0xA000:
ROMBANK2 = ROMPAGE( byData % (NesHeader.byRomSize << 1) );
break;
case 0xB000:
Map183_Reg[0] = (Map183_Reg[0]&0xF0)|(byData&0x0F);
PPUBANK[ 0 ] = VROMPAGE( Map183_Reg[0] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xB004:
Map183_Reg[0] = (Map183_Reg[0]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 0 ] = VROMPAGE( Map183_Reg[0] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xB008:
Map183_Reg[1] = (Map183_Reg[1]&0xF0)|(byData&0x0F);
PPUBANK[ 1 ] = VROMPAGE( Map183_Reg[1] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xB00C:
Map183_Reg[1] = (Map183_Reg[1]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 1 ] = VROMPAGE( Map183_Reg[1] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xC000:
Map183_Reg[2] = (Map183_Reg[2]&0xF0)|(byData&0x0F);
PPUBANK[ 2 ] = VROMPAGE( Map183_Reg[2] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xC004:
Map183_Reg[2] = (Map183_Reg[2]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 2 ] = VROMPAGE( Map183_Reg[2] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xC008:
Map183_Reg[3] = (Map183_Reg[3]&0xF0)|(byData&0x0F);
PPUBANK[ 3 ] = VROMPAGE( Map183_Reg[3] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xC00C:
Map183_Reg[3] = (Map183_Reg[3]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 3 ] = VROMPAGE( Map183_Reg[3] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xD000:
Map183_Reg[4] = (Map183_Reg[4]&0xF0)|(byData&0x0F);
PPUBANK[ 4 ] = VROMPAGE( Map183_Reg[4] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xD004:
Map183_Reg[4] = (Map183_Reg[4]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 4 ] = VROMPAGE( Map183_Reg[4] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xD008:
Map183_Reg[5] = (Map183_Reg[5]&0xF0)|(byData&0x0F);
PPUBANK[ 5 ] = VROMPAGE( Map183_Reg[5] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xD00C:
Map183_Reg[5] = (Map183_Reg[5]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 5 ] = VROMPAGE( Map183_Reg[5] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xE000:
Map183_Reg[6] = (Map183_Reg[6]&0xF0)|(byData&0x0F);
PPUBANK[ 6 ] = VROMPAGE( Map183_Reg[6] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xE004:
Map183_Reg[6] = (Map183_Reg[6]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 6 ] = VROMPAGE( Map183_Reg[6] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xE008:
Map183_Reg[7] = (Map183_Reg[3]&0xF0)|(byData&0x0F);
PPUBANK[ 7 ] = VROMPAGE( Map183_Reg[7] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0xE00C:
Map183_Reg[7] = (Map183_Reg[3]&0x0F)|((byData&0x0F)<<4);
PPUBANK[ 7 ] = VROMPAGE( Map183_Reg[7] % (NesHeader.byVRomSize << 3) );
InfoNES_SetupChr();
break;
case 0x9008:
if( byData == 1 ) {
for( int i = 0; i < 8; i++ ) {
Map183_Reg[i] = i;
}
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 ) {
PPUBANK[ 0 ] = VROMPAGE( 0 );
PPUBANK[ 1 ] = VROMPAGE( 1 );
PPUBANK[ 2 ] = VROMPAGE( 2 );
PPUBANK[ 3 ] = VROMPAGE( 3 );
PPUBANK[ 4 ] = VROMPAGE( 4 );
PPUBANK[ 5 ] = VROMPAGE( 5 );
PPUBANK[ 6 ] = VROMPAGE( 6 );
PPUBANK[ 7 ] = VROMPAGE( 7 );
InfoNES_SetupChr();
}
}
break;
case 0x9800:
if( byData == 0 ) InfoNES_Mirroring( 1 );
else if( byData == 1 ) InfoNES_Mirroring( 0 );
else if( byData == 2 ) InfoNES_Mirroring( 2 );
else if( byData == 3 ) InfoNES_Mirroring( 3 );
break;
case 0xF000:
Map183_IRQ_Counter = (Map183_IRQ_Counter&0xFF00)|byData;
break;
case 0xF004:
Map183_IRQ_Counter = (Map183_IRQ_Counter&0x00FF)|(byData<<8);
break;
case 0xF008:
Map183_IRQ_Enable = byData;
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 183 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map183_HSync()
{
if( Map183_IRQ_Enable & 0x02 ) {
if( Map183_IRQ_Counter <= 113 ) {
Map183_IRQ_Counter = 0;
IRQ_REQ;
} else {
Map183_IRQ_Counter -= 113;
}
}
}
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