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/*===================================================================*/
/* */
/* Mapper 236 : 800-in-1 */
/* */
/*===================================================================*/
BYTE Map236_Bank, Map236_Mode;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 236 */
/*-------------------------------------------------------------------*/
void Map236_Init()
{
/* Initialize Mapper */
MapperInit = Map236_Init;
/* Write to Mapper */
MapperWrite = Map236_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 Registers */
Map236_Bank = Map236_Mode = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 236 Write Function */
/*-------------------------------------------------------------------*/
void Map236_Write( WORD wAddr, BYTE byData )
{
if( wAddr >= 0x8000 && wAddr <= 0xBFFF ) {
Map236_Bank = ((wAddr&0x03)<<4)|(Map236_Bank&0x07);
} else {
Map236_Bank = (wAddr&0x07)|(Map236_Bank&0x30);
Map236_Mode = wAddr&0x30;
}
if( wAddr & 0x20 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
switch( Map236_Mode ) {
case 0x00:
Map236_Bank |= 0x08;
ROMBANK0 = ROMPAGE(((Map236_Bank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((Map236_Bank<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((Map236_Bank|0x07)<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((Map236_Bank|0x07)<<1)+1) % (NesHeader.byRomSize<<1));
break;
case 0x10:
Map236_Bank |= 0x37;
ROMBANK0 = ROMPAGE(((Map236_Bank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((Map236_Bank<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((Map236_Bank|0x07)<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((Map236_Bank|0x07)<<1)+1) % (NesHeader.byRomSize<<1));
break;
case 0x20:
Map236_Bank |= 0x08;
ROMBANK0 = ROMPAGE((((Map236_Bank&0xFE)<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE((((Map236_Bank&0xFE)<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE((((Map236_Bank&0xFE)<<1)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE((((Map236_Bank&0xFE)<<1)+3) % (NesHeader.byRomSize<<1));
break;
case 0x30:
Map236_Bank |= 0x08;
ROMBANK0 = ROMPAGE(((Map236_Bank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((Map236_Bank<<1)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((Map236_Bank<<1)+0) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((Map236_Bank<<1)+1) % (NesHeader.byRomSize<<1));
break;
}
}
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