139 lines
2.6 KiB
C++
139 lines
2.6 KiB
C++
#include "nes_mapper.h"
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void MAP10_set_VROM_1000(void);
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void MAP10_set_VROM_0000(void);
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// Mapper 10
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void MAP10_Reset()
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{
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int i;
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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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for(i = 0; i < sizeof(MAPx->regs)/sizeof(MAPx->regs[0]); i++)
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MAPx->regs[i] = 0;
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MAPx->regs[2] = 4;
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MAPx->irq_enabled = 0xFE;
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MAPx->irq_counter = 0xFE;
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MAP10_set_VROM_0000();
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MAP10_set_VROM_1000();
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}
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void MAP10_PPU_Latch_FDFE(uint32 addr)
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{
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if(addr & 0x1000)
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{
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MAPx->irq_counter = (addr & 0x0FF0) >> 4;
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MAP10_set_VROM_1000();
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}
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else
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{
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MAPx->irq_enabled = (addr & 0x0FF0) >> 4;
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MAP10_set_VROM_0000();
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}
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}
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void MAP10_set_VROM_0000(void)
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{
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int bank_num = (MAPx->irq_enabled == 0xFD) ? MAPx->regs[1] : MAPx->regs[2];
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bank_num <<= 2;
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set_PPU_bank0(bank_num+0);
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set_PPU_bank1(bank_num+1);
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set_PPU_bank2(bank_num+2);
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set_PPU_bank3(bank_num+3);
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}
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void MAP10_set_VROM_1000(void)
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{
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int bank_num = (MAPx->irq_counter == 0xFD) ? MAPx->regs[3] : MAPx->regs[4];
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bank_num <<= 2;
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set_PPU_bank4(bank_num+0);
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set_PPU_bank5(bank_num+1);
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set_PPU_bank6(bank_num+2);
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set_PPU_bank7(bank_num+3);
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}
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void MAP10_MemoryWrite(uint16 addr, uint8 data)
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{
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uint8 bank_num;
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switch(addr & 0xF000)
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{
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case 0xA000:
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{
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MAPx->regs[0] = data;
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// 16K ROM bank at $8000
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bank_num = MAPx->regs[0];
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set_CPU_bank4(bank_num*2);
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set_CPU_bank5(bank_num*2+1);
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}
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break;
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case 0xB000:
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{
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// B000-BFFF: select 4k VROM for (0000) $FD latch
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MAPx->regs[1] = data;
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MAP10_set_VROM_0000();
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}
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break;
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case 0xC000:
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{
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// C000-CFFF: select 4k VROM for (0000) $FE latch
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MAPx->regs[2] = data;
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MAP10_set_VROM_0000();
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}
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break;
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case 0xD000:
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{
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// D000-DFFF: select 4k VROM for (1000) $FD latch
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MAPx->regs[3] = data;
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MAP10_set_VROM_1000();
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}
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break;
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case 0xE000:
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{
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// E000-EFFF: select 4k VROM for (1000) $FE latch
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MAPx->regs[4] = data;
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MAP10_set_VROM_1000();
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}
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break;
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case 0xF000:
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{
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MAPx->regs[5] = data;
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if(MAPx->regs[5] & 0x01)
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{
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set_mirroring(0,0,1,1);//ˮƽ<CBAE><C6BD><EFBFBD><EFBFBD>InfoNES_Mirroring( 0 ); //0011
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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);//<2F><>ֱ<EFBFBD><D6B1><EFBFBD><EFBFBD>InfoNES_Mirroring( 1 ); //0101
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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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}
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}
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void MAP10_Init()
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{
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NES_Mapper->Reset = MAP10_Reset;
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NES_Mapper->Write = MAP10_MemoryWrite;
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}
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