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player/Project/Src/NES/mapper/017.cpp
2025-06-27 00:32:57 +08:00

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#include "nes_mapper.h"
/////////////////////////////////////////////////////////////////////
// Mapper 17
void MAP17_Reset()
{
// // 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 MAP17_MemoryWriteLow(uint16 addr, uint8 data)
{
switch(addr)
{
case 0x42FE:
{
if((data & 0x10) == 0)
{
set_mirroring(0,0,0,0);
}
else
{
set_mirroring(1,1,1,1);
}
}
break;
case 0x42FF:
{
if((data & 0x10) == 0)
{
set_mirroring(0,1,0,1);//´¹Ö±¾µÏñInfoNES_Mirroring( 1 ); //0101
//set_mirroring(NES_PPU::MIRROR_VERT);
}
else
{
set_mirroring(0,0,1,1);//ˮƽ¾µÏñInfoNES_Mirroring( 0 ); //0011
//set_mirroring(NES_PPU::MIRROR_HORIZ);
}
}
break;
case 0x4501:
{
MAPx->irq_enabled = 0;
}
break;
case 0x4502:
{
MAPx->irq_latch = (MAPx->irq_latch & 0xFF00) | data;
}
break;
case 0x4503:
{
MAPx->irq_latch = (MAPx->irq_latch & 0x00FF) | ((uint32)data << 8);
MAPx->irq_counter = MAPx->irq_latch;
MAPx->irq_enabled = 1;
}
break;
case 0x4504:
{
set_CPU_bank4(data);
}
break;
case 0x4505:
{
set_CPU_bank5(data);
}
break;
case 0x4506:
{
set_CPU_bank6(data);
}
break;
case 0x4507:
{
set_CPU_bank7(data);
}
break;
case 0x4510:
{
set_PPU_bank0(data);
}
break;
case 0x4511:
{
set_PPU_bank1(data);
}
break;
case 0x4512:
{
set_PPU_bank2(data);
}
break;
case 0x4513:
{
set_PPU_bank3(data);
}
break;
case 0x4514:
{
set_PPU_bank4(data);
}
break;
case 0x4515:
{
set_PPU_bank5(data);
}
break;
case 0x4516:
{
set_PPU_bank6(data);
}
break;
case 0x4517:
{
set_PPU_bank7(data);
}
break;
}
}
void MAP17_HSync(int scanline)
{
if(MAPx->irq_enabled)
{
if(MAPx->irq_counter >= 0xFFFF - 113)
{
CPU_IRQ;
MAPx->irq_counter = 0;
MAPx->irq_enabled = 0;
}
else
{
MAPx->irq_counter += 113;
}
}
}
void MAP17_Init()
{
NES_Mapper->Reset = MAP17_Reset;
NES_Mapper->WriteLow = MAP17_MemoryWriteLow;
NES_Mapper->HSync = MAP17_HSync;
}