118 lines
2.2 KiB
C++
118 lines
2.2 KiB
C++
#include "nes_mapper.h"
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/////////////////////////////////////////////////////////////////////
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// Mapper 6
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void MAP6_Reset()
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{
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// // set CPU bank pointers
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// set_CPU_banks(0,1,14,15);
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// set PPU bank pointers
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if(num_1k_VROM_banks)
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{
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set_PPU_banks(0,1,2,3,4,5,6,7);
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}
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else
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{
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set_VRAM_bank(0, 0);
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set_VRAM_bank(0, 1);
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set_VRAM_bank(0, 2);
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set_VRAM_bank(0, 3);
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set_VRAM_bank(0, 4);
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set_VRAM_bank(0, 5);
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set_VRAM_bank(0, 6);
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set_VRAM_bank(0, 7);
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}
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// parent_NES->ppu->vram_size = 0x8000;
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}
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void MAP6_MemoryWriteLow(uint16 addr, uint8 data)
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{
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switch(addr)
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{
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case 0x42FE:
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{
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if(data & 0x10)
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{
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set_mirroring(1,1,1,1);
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}
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else
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{
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set_mirroring(0,0,0,0);
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}
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}
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break;
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case 0x42FF:
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{
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if(data & 0x10)
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{
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set_mirroring(0,0,1,1);//ËŽĆ˝žľĎń
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//set_mirroring(NES_PPU::MIRROR_HORIZ);
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}
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else
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{
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set_mirroring(0,1,0,1);//´šÖąžľĎń
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//set_mirroring(NES_PPU::MIRROR_VERT);
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}
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}
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break;
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case 0x4501:
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{
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MAPx->irq_enabled = 0;
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}
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break;
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case 0x4502:
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{
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MAPx->irq_counter = (MAPx->irq_counter & 0xFF00) | (uint32)data;
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}
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break;
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case 0x4503:
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{
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MAPx->irq_counter = (MAPx->irq_counter & 0x00FF) | ((uint32)data << 8);
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MAPx->irq_enabled = 1;
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}
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break;
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}
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}
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void MAP6_MemoryWrite(uint16 addr, uint8 data)
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{
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uint8 prg_bank = (data & 0x3C) >> 2;
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uint8 chr_bank = data & 0x03;
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set_CPU_bank4(prg_bank*2+0);
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set_CPU_bank5(prg_bank*2+1);
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set_VRAM_bank(0, chr_bank * 8 + 0);
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set_VRAM_bank(1, chr_bank * 8 + 1);
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set_VRAM_bank(2, chr_bank * 8 + 2);
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set_VRAM_bank(3, chr_bank * 8 + 3);
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set_VRAM_bank(4, chr_bank * 8 + 4);
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set_VRAM_bank(5, chr_bank * 8 + 5);
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set_VRAM_bank(6, chr_bank * 8 + 6);
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set_VRAM_bank(7, chr_bank * 8 + 7);
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}
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void MAP6_HSync(int scanline)
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{
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if(MAPx->irq_enabled)
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{
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MAPx->irq_counter += 133;
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if(MAPx->irq_counter >= 0xFFFF)
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{
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CPU_IRQ;
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MAPx->irq_counter = 0;
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}
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}
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}
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void MAP6_Init()
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{
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NES_Mapper->Reset = MAP6_Reset;
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NES_Mapper->Write = MAP6_MemoryWrite;
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NES_Mapper->HSync = MAP6_HSync;
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NES_Mapper->WriteLow=MAP6_MemoryWriteLow;
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}
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