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player/Project/Src/NES/mapper/024.cpp
2025-06-27 00:32:57 +08:00

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#include "nes_mapper.h"
/////////////////////////////////////////////////////////////////////
// Mapper 24
void MAP24_Reset()
{
// // Init ExSound
// parent_NES->apu->SelectExSound(1);
// // set CPU bank pointers
// set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
// set PPU bank pointers
if(num_1k_VROM_banks)
{
set_PPU_banks(0,1,2,3,4,5,6,7);
}
MAPx->irq_enabled = 0;
MAPx->irq_counter = 0;
MAPx->irq_latch = 0;
}
void MAP24_MemoryWrite(uint16 addr, uint8 data)
{
switch(addr & 0xF003)
{
case 0x8000:
{
set_CPU_bank4(data*2+0);
set_CPU_bank5(data*2+1);
}
break;
case 0xB003:
{
data = data & 0x0C;
if(data == 0x00)
{
set_mirroring(0,1,0,1);//´¹Ö±¾µÏñInfoNES_Mirroring( 1 ); //0101
//set_mirroring(NES_PPU::MIRROR_VERT);
}
else if(data == 0x04)
{
set_mirroring(0,0,1,1);//ˮƽ¾µÏñInfoNES_Mirroring( 0 ); //0011
//set_mirroring(NES_PPU::MIRROR_HORIZ);
}
else if(data == 0x08)
{
set_mirroring(0,0,0,0);
}
else if(data == 0x0C)
{
set_mirroring(1,1,1,1);
}
}
break;
case 0xC000:
{
set_CPU_bank6(data);
}
break;
case 0xD000:
{
set_PPU_bank0(data);
}
break;
case 0xD001:
{
set_PPU_bank1(data);
}
break;
case 0xD002:
{
set_PPU_bank2(data);
}
break;
case 0xD003:
{
set_PPU_bank3(data);
}
break;
case 0xE000:
{
set_PPU_bank4(data);
}
break;
case 0xE001:
{
set_PPU_bank5(data);
}
break;
case 0xE002:
{
set_PPU_bank6(data);
}
break;
case 0xE003:
{
set_PPU_bank7(data);
}
break;
case 0xF000:
{
MAPx->irq_latch = data;
}
break;
case 0xF001:
{
MAPx->irq_enabled = data & 0x03;
if(MAPx->irq_enabled & 0x02)
{
MAPx->irq_counter = MAPx->irq_latch;
}
}
break;
case 0xF002:
{
if(MAPx->irq_enabled & 0x01)
{
MAPx->irq_enabled |= 0x02;
}
else
{
MAPx->irq_enabled &= 0x01;
}
}
break;
}
// parent_NES->apu->ExWrite(addr, data);
}
void MAP24_HSync(int scanline)
{
if(MAPx->irq_enabled & 0x02)
{
if(MAPx->irq_counter == 0xFF)
{
CPU_IRQ;
MAPx->irq_counter = MAPx->irq_latch;
}
else
{
MAPx->irq_counter++;
}
}
}
void MAP24_Init()
{
NES_Mapper->Reset = MAP24_Reset;
NES_Mapper->Write = MAP24_MemoryWrite;
NES_Mapper->HSync = MAP24_HSync;
}