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/*===================================================================*/
/* */
/* Mapper 105 : Nintendo World Championship */
/* */
/*===================================================================*/
BYTE Map105_Init_State;
BYTE Map105_Write_Count;
BYTE Map105_Bits;
BYTE Map105_Reg[4];
BYTE Map105_IRQ_Enable;
int Map105_IRQ_Counter;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 105 */
/*-------------------------------------------------------------------*/
void Map105_Init()
{
/* Initialize Mapper */
MapperInit = Map105_Init;
/* Write to Mapper */
MapperWrite = Map105_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 = Map105_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 PPU Banks */
Map105_Reg[0] = 0x0C;
Map105_Reg[1] = 0x00;
Map105_Reg[2] = 0x00;
Map105_Reg[3] = 0x10;
Map105_Bits = 0;
Map105_Write_Count = 0;
Map105_IRQ_Counter = 0;
Map105_IRQ_Enable = 0;
Map105_Init_State = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 105 Write Function */
/*-------------------------------------------------------------------*/
void Map105_Write( WORD wAddr, BYTE byData )
{
WORD reg_num = (wAddr & 0x7FFF) >> 13;
if( byData & 0x80 ) {
Map105_Bits = Map105_Write_Count = 0;
if( reg_num == 0 ) {
Map105_Reg[reg_num] |= 0x0C;
}
} else {
Map105_Bits |= (byData & 1) << Map105_Write_Count++;
if( Map105_Write_Count == 5) {
Map105_Reg[reg_num] = Map105_Bits & 0x1F;
Map105_Bits = Map105_Write_Count = 0;
}
}
if( Map105_Reg[0] & 0x02 ) {
if( Map105_Reg[0] & 0x01 ) {
InfoNES_Mirroring( 0 );
} else {
InfoNES_Mirroring( 1 );
}
} else {
if( Map105_Reg[0] & 0x01 ) {
InfoNES_Mirroring( 3 );
} else {
InfoNES_Mirroring( 2 );
}
}
switch( Map105_Init_State ) {
case 0:
case 1:
Map105_Init_State++;
break;
case 2:
if(Map105_Reg[1] & 0x08) {
if (Map105_Reg[0] & 0x08) {
if (Map105_Reg[0] & 0x04) {
ROMBANK0 = ROMPAGE( ((Map105_Reg[3] & 0x07) * 2 + 16) % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( ((Map105_Reg[3] & 0x07) * 2 + 17) % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( 30 % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( 31 % ( NesHeader.byRomSize << 1 ) );
} else {
ROMBANK0 = ROMPAGE( 16 % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( 17 % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ((Map105_Reg[3] & 0x07) * 2 + 16) % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ((Map105_Reg[3] & 0x07) * 2 + 17) % ( NesHeader.byRomSize << 1 ) );
}
} else {
ROMBANK0 = ROMPAGE( ((Map105_Reg[3] & 0x06) * 2 + 16) % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( ((Map105_Reg[3] & 0x06) * 2 + 17) % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ((Map105_Reg[3] & 0x06) * 2 + 18) % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ((Map105_Reg[3] & 0x06) * 2 + 19) % ( NesHeader.byRomSize << 1 ) );
}
} else {
ROMBANK0 = ROMPAGE( ((Map105_Reg[1] & 0x06) * 2 + 0) % ( NesHeader.byRomSize << 1 ) );
ROMBANK1 = ROMPAGE( ((Map105_Reg[1] & 0x06) * 2 + 1) % ( NesHeader.byRomSize << 1 ) );
ROMBANK2 = ROMPAGE( ((Map105_Reg[1] & 0x06) * 2 + 2) % ( NesHeader.byRomSize << 1 ) );
ROMBANK3 = ROMPAGE( ((Map105_Reg[1] & 0x06) * 2 + 3) % ( NesHeader.byRomSize << 1 ) );
}
if( Map105_Reg[1] & 0x10 ) {
Map105_IRQ_Counter = 0;
Map105_IRQ_Enable = 0;
} else {
Map105_IRQ_Enable = 1;
}
break;
default:
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 105 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map105_HSync()
{
if( !PPU_Scanline ) {
if( Map105_IRQ_Enable ) {
Map105_IRQ_Counter += 29781;
}
if( ((Map105_IRQ_Counter | 0x21FFFFFF) & 0x3E000000) == 0x3E000000 ) {
IRQ_REQ;
}
}
}
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