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/*===================================================================*/
/* */
/* Mapper 96 : Bandai 74161 */
/* */
/*===================================================================*/
BYTE Map96_Reg[2];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 96 */
/*-------------------------------------------------------------------*/
void Map96_Init()
{
/* Initialize Mapper */
MapperInit = Map96_Init;
/* Write to Mapper */
MapperWrite = Map96_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 = Map96_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set Registers */
Map96_Reg[0] = Map96_Reg[1] = 0;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 2 );
ROMBANK3 = ROMPAGE( 3 );
/* Set PPU Banks */
Map96_Set_Banks();
InfoNES_Mirroring( 3 );
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 96 Write Function */
/*-------------------------------------------------------------------*/
void Map96_Write( WORD wAddr, BYTE byData )
{
ROMBANK0 = ROMPAGE((((byData & 0x03)<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((((byData & 0x03)<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((byData & 0x03)<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((byData & 0x03)<<2)+3) % (NesHeader.byRomSize<<1));
Map96_Reg[0] = (byData & 0x04) >> 2;
Map96_Set_Banks();
}
/*-------------------------------------------------------------------*/
/* Mapper 96 PPU Function */
/*-------------------------------------------------------------------*/
void Map96_PPU( WORD wAddr )
{
if( (wAddr & 0xF000) == 0x2000 ) {
Map96_Reg[1] = (wAddr>>8)&0x03;
Map96_Set_Banks();
}
}
/*-------------------------------------------------------------------*/
/* Mapper 96 Set Banks Function */
/*-------------------------------------------------------------------*/
void Map96_Set_Banks()
{
PPUBANK[ 0 ] = CRAMPAGE(((Map96_Reg[0]*4+Map96_Reg[1])<<2)+0);
PPUBANK[ 1 ] = CRAMPAGE(((Map96_Reg[0]*4+Map96_Reg[1])<<2)+1);
PPUBANK[ 2 ] = CRAMPAGE(((Map96_Reg[0]*4+Map96_Reg[1])<<2)+2);
PPUBANK[ 3 ] = CRAMPAGE(((Map96_Reg[0]*4+Map96_Reg[1])<<2)+3);
PPUBANK[ 4 ] = CRAMPAGE(((Map96_Reg[0]*4+0x03)<<2)+0);
PPUBANK[ 5 ] = CRAMPAGE(((Map96_Reg[0]*4+0x03)<<2)+1);
PPUBANK[ 6 ] = CRAMPAGE(((Map96_Reg[0]*4+0x03)<<2)+2);
PPUBANK[ 7 ] = CRAMPAGE(((Map96_Reg[0]*4+0x03)<<2)+3);
InfoNES_SetupChr();
}
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