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/*===================================================================*/
/* */
/* Mapper 231 : 20-in-1 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 231 */
/*-------------------------------------------------------------------*/
void Map231_Init()
{
/* Initialize Mapper */
MapperInit = Map231_Init;
/* Write to Mapper */
MapperWrite = Map231_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 = ROMPAGE( 2 );
ROMBANK3 = ROMPAGE( 3 );
/* 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 231 Write Function */
/*-------------------------------------------------------------------*/
void Map231_Write( WORD wAddr, BYTE byData )
{
BYTE byBank = wAddr & 0x1E;
if( wAddr & 0x0020 ) {
ROMBANK0 = ROMPAGE(((byBank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<1)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<1)+3) % (NesHeader.byRomSize<<1));
} else {
ROMBANK0 = ROMPAGE(((byBank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<1)+1) % (NesHeader.byRomSize<<1));
}
if( wAddr & 0x0080 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
}
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