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/*===================================================================*/
/* */
/* Mapper 234 : Maxi-15 */
/* */
/*===================================================================*/
BYTE Map234_Reg[2];
/*-------------------------------------------------------------------*/
/* Initialize Mapper 234 */
/*-------------------------------------------------------------------*/
void Map234_Init()
{
/* Initialize Mapper */
MapperInit = Map234_Init;
/* Write to Mapper */
MapperWrite = Map234_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 Registers */
Map234_Reg[0] = 0;
Map234_Reg[1] = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 234 Write Function */
/*-------------------------------------------------------------------*/
void Map234_Write( WORD wAddr, BYTE byData )
{
if( wAddr >= 0xFF80 && wAddr <= 0xFF9F ) {
if( !Map234_Reg[0] ) {
Map234_Reg[0] = byData;
Map234_Set_Banks();
}
}
if( wAddr >= 0xFFE8 && wAddr <= 0xFFF7 ) {
Map234_Reg[1] = byData;
Map234_Set_Banks();
}
}
/*-------------------------------------------------------------------*/
/* Mapper 234 Set Banks Function */
/*-------------------------------------------------------------------*/
void Map234_Set_Banks()
{
BYTE byPrg, byChr;
if( Map234_Reg[0] & 0x80 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
if( Map234_Reg[0] & 0x40 ) {
byPrg = (Map234_Reg[0]&0x0E)|(Map234_Reg[1]&0x01);
byChr = ((Map234_Reg[0]&0x0E)<<2)|((Map234_Reg[1]>>4)&0x07);
} else {
byPrg = Map234_Reg[0]&0x0F;
byChr = ((Map234_Reg[0]&0x0F)<<2)|((Map234_Reg[1]>>4)&0x03);
}
/* Set ROM Banks */
ROMBANK0 = ROMPAGE(((byPrg<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byPrg<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byPrg<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byPrg<<2)+3) % (NesHeader.byRomSize<<1));
/* Set PPU Banks */
PPUBANK[ 0 ] = VROMPAGE(((byChr<<3)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[ 1 ] = VROMPAGE(((byChr<<3)+1) % (NesHeader.byVRomSize<<3));
PPUBANK[ 2 ] = VROMPAGE(((byChr<<3)+2) % (NesHeader.byVRomSize<<3));
PPUBANK[ 3 ] = VROMPAGE(((byChr<<3)+3) % (NesHeader.byVRomSize<<3));
PPUBANK[ 4 ] = VROMPAGE(((byChr<<3)+4) % (NesHeader.byVRomSize<<3));
PPUBANK[ 5 ] = VROMPAGE(((byChr<<3)+5) % (NesHeader.byVRomSize<<3));
PPUBANK[ 6 ] = VROMPAGE(((byChr<<3)+6) % (NesHeader.byVRomSize<<3));
PPUBANK[ 7 ] = VROMPAGE(((byChr<<3)+7) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
}
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