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/*===================================================================*/
/* */
/* Mapper 88 (Namco 118) */
/* */
/*===================================================================*/
BYTE Map88_Regs[ 1 ];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 88 */
/*-------------------------------------------------------------------*/
void Map88_Init()
{
/* Initialize Mapper */
MapperInit = Map88_Init;
/* Write to Mapper */
MapperWrite = Map88_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 = Map0_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();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 88 Write Function */
/*-------------------------------------------------------------------*/
void Map88_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr )
{
case 0x8000:
Map88_Regs[ 0 ] = byData;
break;
case 0x8001:
switch ( Map88_Regs[ 0 ] & 0x07 )
{
case 0x00:
PPUBANK[ 0 ] = VROMPAGE( ( ( byData & 0xfe ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 1 ] = VROMPAGE( ( ( byData & 0xfe ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x01:
PPUBANK[ 2 ] = VROMPAGE( ( ( byData & 0xfe ) + 0 ) % ( NesHeader.byVRomSize << 3 ) );
PPUBANK[ 3 ] = VROMPAGE( ( ( byData & 0xfe ) + 1 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x02:
PPUBANK[ 4 ] = VROMPAGE( ( byData + 0x40 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x03:
PPUBANK[ 5 ] = VROMPAGE( ( byData + 0x40 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x04:
PPUBANK[ 6 ] = VROMPAGE( ( byData + 0x40 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x05:
PPUBANK[ 7 ] = VROMPAGE( ( byData + 0x40 ) % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0x06:
ROMBANK0 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
case 0x07:
ROMBANK1 = ROMPAGE( byData % ( NesHeader.byRomSize << 1 ) );
break;
}
break;
case 0xc000:
if ( byData )
{
InfoNES_Mirroring( 2 );
} else {
InfoNES_Mirroring( 3 );
}
break;
}
}
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