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/*===================================================================*/
/* */
/* Mapper 122 (Sunsoft) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 122 */
/*-------------------------------------------------------------------*/
void Map122_Init()
{
/* Initialize Mapper */
MapperInit = Map122_Init;
/* Write to Mapper */
MapperWrite = Map0_Write;
/* Write to SRAM */
MapperSram = Map122_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 up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 122 Write to Sram Function */
/*-------------------------------------------------------------------*/
void Map122_Sram( WORD wAddr, BYTE byData )
{
if ( wAddr == 0x6000 )
{
BYTE byChrBank0 = byData & 0x07;
BYTE byChrBank1 = ( byData & 0x70 ) >> 4;
byChrBank0 = ( byChrBank0 << 2 ) % ( NesHeader.byVRomSize << 3 );
byChrBank1 = ( byChrBank1 << 2 ) % ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byChrBank0 + 0 );
PPUBANK[ 1 ] = VROMPAGE( byChrBank0 + 1 );
PPUBANK[ 2 ] = VROMPAGE( byChrBank0 + 2 );
PPUBANK[ 3 ] = VROMPAGE( byChrBank0 + 3 );
PPUBANK[ 4 ] = VROMPAGE( byChrBank1 + 0 );
PPUBANK[ 5 ] = VROMPAGE( byChrBank1 + 1 );
PPUBANK[ 6 ] = VROMPAGE( byChrBank1 + 2 );
PPUBANK[ 7 ] = VROMPAGE( byChrBank1 + 3 );
InfoNES_SetupChr();
}
}
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