303 lines
6.2 KiB
C++
303 lines
6.2 KiB
C++
#include "nes_mapper.h"
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// Mapper 25
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void MAP25_Reset()
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{
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int i;
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// patch = 0;
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// if(parent_NES->crc32() == 0xea74c587 || // Teenage Mutant Ninja Turtles
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// parent_NES->crc32() == 0x5f82cb7d || // Teenage Mutant Ninja Turtles 2
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// parent_NES->crc32() == 0xa2e68da8) // Racer Mini Yonku - Japan Cup
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// {
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// patch = 1;
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// }
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// // set CPU bank pointers
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// set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
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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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for( i = 0; i < 8; i++)
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MAPx->regs[i] = 0;
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MAPx->regs[8] = 0;
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MAPx->regs[9] = num_8k_ROM_banks-2;
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MAPx->regs[10] = 0;
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MAPx->irq_enabled = 0;
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MAPx->irq_counter = 0;
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MAPx->irq_latch = 0;
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}
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void MAP25_MemoryWrite(uint16 addr, uint8 data)
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{
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// MAPx->regs[0] ... 1K VROM bank at PPU $0000
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// MAPx->regs[1] ... 1K VROM bank at PPU $0400
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// MAPx->regs[2] ... 1K VROM bank at PPU $0800
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// MAPx->regs[3] ... 1K VROM bank at PPU $0C00
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// MAPx->regs[4] ... 1K VROM bank at PPU $1000
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// MAPx->regs[5] ... 1K VROM bank at PPU $1400
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// MAPx->regs[6] ... 1K VROM bank at PPU $1800
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// MAPx->regs[7] ... 1K VROM bank at PPU $1C00
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// MAPx->regs[8] ... 8K ROM bank at CPU $8000
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// MAPx->regs[9] ... 8K ROM bank at CPU $C000
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// MAPx->regs[10] .. ROM Swap flag
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switch(addr & 0xF000)
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{
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case 0x8000:
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{
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if(MAPx->regs[10] & 0x02)
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{
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MAPx->regs[9] = data;
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set_CPU_bank6(data);
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}
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else
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{
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MAPx->regs[8] = data;
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set_CPU_bank4(data);
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}
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}
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break;
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case 0xA000:
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{
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set_CPU_bank5(data);
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}
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break;
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}
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switch(addr & 0xF00F)
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{
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case 0x9000:
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{
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data &= 0x03;
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if(data == 0)
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{
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set_mirroring(0,1,0,1);//´šÖąžľĎńInfoNES_Mirroring( 1 ); //0101
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//set_mirroring(NES_PPU::MIRROR_VERT);
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}
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else if(data == 1)
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{
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set_mirroring(0,0,1,1);//ËŽĆ˝žľĎńInfoNES_Mirroring( 0 ); //0011
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//set_mirroring(NES_PPU::MIRROR_HORIZ);
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}
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else if(data == 2)
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{
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set_mirroring(0,0,0,0);
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}
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else
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{
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set_mirroring(1,1,1,1);
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}
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}
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break;
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case 0x9001:
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case 0x9004:
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{
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if((MAPx->regs[10] & 0x02) != (data & 0x02))
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{
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uint8 swap = MAPx->regs[8];
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MAPx->regs[8] = MAPx->regs[9];
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MAPx->regs[9] = swap;
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set_CPU_bank4(MAPx->regs[8]);
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set_CPU_bank6(MAPx->regs[9]);
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}
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MAPx->regs[10] = data;
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}
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break;
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case 0xB000:
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{
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MAPx->regs[0] = (MAPx->regs[0] & 0xF0) | (data & 0x0F);
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set_PPU_bank0(MAPx->regs[0]);
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}
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break;
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case 0xB001:
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case 0xB004:
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{
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MAPx->regs[1] = (MAPx->regs[1] & 0xF0) | (data & 0x0F);
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set_PPU_bank1(MAPx->regs[1]);
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}
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break;
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case 0xB002:
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case 0xB008:
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{
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MAPx->regs[0] = (MAPx->regs[0] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank0(MAPx->regs[0]);
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}
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break;
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case 0xB003:
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case 0xB00C:
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{
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MAPx->regs[1] = (MAPx->regs[1] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank1(MAPx->regs[1]);
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}
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break;
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case 0xC000:
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{
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MAPx->regs[2] = (MAPx->regs[2] & 0xF0) | (data & 0x0F);
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set_PPU_bank2(MAPx->regs[2]);
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}
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break;
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case 0xC001:
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case 0xC004:
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{
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MAPx->regs[3] = (MAPx->regs[3] & 0xF0) | (data & 0x0F);
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set_PPU_bank3(MAPx->regs[3]);
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}
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break;
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case 0xC002:
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case 0xC008:
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{
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MAPx->regs[2] = (MAPx->regs[2] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank2(MAPx->regs[2]);
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}
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break;
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case 0xC003:
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case 0xC00C:
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{
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MAPx->regs[3] = (MAPx->regs[3] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank3(MAPx->regs[3]);
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}
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break;
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case 0xD000:
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{
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MAPx->regs[4] = (MAPx->regs[4] & 0xF0) | (data & 0x0F);
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set_PPU_bank4(MAPx->regs[4]);
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}
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break;
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case 0xD001:
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case 0xD004:
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{
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MAPx->regs[5] = (MAPx->regs[5] & 0xF0) | (data & 0x0F);
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set_PPU_bank5(MAPx->regs[5]);
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}
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break;
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case 0xD002:
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case 0xD008:
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{
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MAPx->regs[4] = (MAPx->regs[4] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank4(MAPx->regs[4]);
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}
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break;
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case 0xD003:
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case 0xD00C:
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{
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MAPx->regs[5] = (MAPx->regs[5] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank5(MAPx->regs[5]);
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}
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break;
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case 0xE000:
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{
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MAPx->regs[6] = (MAPx->regs[6] & 0xF0) | (data & 0x0F);
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set_PPU_bank6(MAPx->regs[6]);
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}
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break;
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case 0xE001:
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case 0xE004:
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{
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MAPx->regs[7] = (MAPx->regs[7] & 0xF0) | (data & 0x0F);
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set_PPU_bank7(MAPx->regs[7]);
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}
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break;
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case 0xE002:
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case 0xE008:
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{
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MAPx->regs[6] = (MAPx->regs[6] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank6(MAPx->regs[6]);
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}
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break;
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case 0xE003:
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case 0xE00C:
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{
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MAPx->regs[7] = (MAPx->regs[7] & 0x0F) | ((data & 0x0F) << 4);
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set_PPU_bank7(MAPx->regs[7]);
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}
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break;
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case 0xF000:
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{
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MAPx->irq_latch = (MAPx->irq_latch & 0xF0) | (data & 0x0F);
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}
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break;
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case 0xF001:
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case 0xF004:
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{
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MAPx->irq_enabled = data & 0x03;
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if(MAPx->irq_enabled & 0x02)
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{
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MAPx->irq_counter = MAPx->irq_latch;
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}
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}
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break;
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case 0xF002:
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case 0xF008:
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{
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MAPx->irq_latch = (MAPx->irq_latch & 0x0F) | ((data & 0x0F) << 4);
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}
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break;
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case 0xF003:
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case 0xF00C:
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{
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MAPx->irq_enabled = (MAPx->irq_enabled & 0x01) * 3;
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}
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break;
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}
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}
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void MAP25_HSync(int scanline)
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{
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if(MAPx->irq_enabled & 0x02)
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{
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if(MAPx->irq_counter == 0xFF)
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{
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MAPx->irq_counter = MAPx->irq_latch;
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CPU_IRQ;
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}
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// else if(patch && MAPx->irq_counter == 0x00)
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// {
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// MAPx->irq_counter = MAPx->irq_latch;
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// CPU_IRQ;
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// }
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else
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{
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MAPx->irq_counter++;
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}
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}
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}
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void MAP25_Init()
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{
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NES_Mapper->Reset = MAP25_Reset;
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NES_Mapper->Write = MAP25_MemoryWrite;
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NES_Mapper->HSync = MAP25_HSync;
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}
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