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/*===================================================================*/
/* */
/* Mapper 227 : 1200-in-1 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 227 */
/*-------------------------------------------------------------------*/
void Map227_Init()
{
/* Initialize Mapper */
MapperInit = Map227_Init;
/* Write to Mapper */
MapperWrite = Map227_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( 0 );
ROMBANK3 = ROMPAGE( 1 );
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 227 Write Function */
/*-------------------------------------------------------------------*/
void Map227_Write( WORD wAddr, BYTE byData )
{
BYTE byBank = ((wAddr&0x0100)>>4)|((wAddr&0x0078)>>3);
if( wAddr & 0x0001 ) {
ROMBANK0 = ROMPAGE(((byBank<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<2)+3) % (NesHeader.byRomSize<<1));
} else {
if( wAddr & 0x0004 ) {
ROMBANK0 = ROMPAGE(((byBank<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<2)+3) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<2)+3) % (NesHeader.byRomSize<<1));
} else {
ROMBANK0 = ROMPAGE(((byBank<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<2)+1) % (NesHeader.byRomSize<<1));
}
}
if( !(wAddr & 0x0080) ) {
if( wAddr & 0x0200 ) {
ROMBANK2 = ROMPAGE((((byBank&0x1C)<<2)+14) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((byBank&0x1C)<<2)+15) % (NesHeader.byRomSize<<1));
} else {
ROMBANK2 = ROMPAGE((((byBank&0x1C)<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((byBank&0x1C)<<2)+1) % (NesHeader.byRomSize<<1));
}
}
if( wAddr & 0x0002 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
}
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