mirror of https://github.com/bsnes-emu/bsnes.git
35 lines
798 B
C++
35 lines
798 B
C++
#include <fc/fc.hpp>
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namespace Famicom {
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Bus bus;
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//$0000-07ff = RAM (2KB)
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//$0800-1fff = RAM (mirror)
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//$2000-2007 = PPU
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//$2008-3fff = PPU (mirror)
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//$4000-4017 = APU + I/O
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//$4018-ffff = Cartridge
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auto Bus::read(uint16 addr) -> uint8 {
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uint8 data = cartridge.prg_read(addr);
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if(addr <= 0x1fff) data = cpu.readRAM(addr);
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else if(addr <= 0x3fff) data = ppu.readIO(addr);
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else if(addr <= 0x4017) data = cpu.readIO(addr);
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if(cheat.enable()) {
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if(auto result = cheat.find(addr, data)) return result();
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}
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return data;
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}
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auto Bus::write(uint16 addr, uint8 data) -> void {
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cartridge.prg_write(addr, data);
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if(addr <= 0x1fff) return cpu.writeRAM(addr, data);
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if(addr <= 0x3fff) return ppu.writeIO(addr, data);
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if(addr <= 0x4017) return cpu.writeIO(addr, data);
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}
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}
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