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/*===================================================================*/
/* */
/* Mapper 94 (74161/32 Capcom) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 94 */
/*-------------------------------------------------------------------*/
void Map94_Init()
{
/* Initialize Mapper */
MapperInit = Map94_Init;
/* Write to Mapper */
MapperWrite = Map94_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 up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 94 Write Function */
/*-------------------------------------------------------------------*/
void Map94_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr & 0xfff0 )
{
/* Set ROM Banks */
case 0xff00:
byData = ( byData & 0x1c ) >> 2;
byData <<= 1;
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
ROMBANK1 = ROMPAGE( byData + 1 );
break;
}
}
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