mirror of https://github.com/bsnes-emu/bsnes.git
42 lines
935 B
C++
Executable File
42 lines
935 B
C++
Executable File
#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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uint8 Bus::read(uint16 addr) {
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uint8 data = cartridge.prg_read(addr);
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if(addr <= 0x1fff) data = cpu.ram_read(addr);
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else if(addr <= 0x3fff) data = ppu.read(addr);
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else if(addr <= 0x4017) data = cpu.read(addr);
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if(cheat.override[addr]) {
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for(unsigned n = 0; n < cheat.size(); n++) {
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if(cheat[n].addr == addr) {
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if(cheat[n].comp > 255 || cheat[n].comp == data) {
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data = cheat[n].data;
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break;
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}
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}
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}
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}
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return data;
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}
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void Bus::write(uint16 addr, uint8 data) {
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cartridge.prg_write(addr, data);
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if(addr <= 0x1fff) return cpu.ram_write(addr, data);
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if(addr <= 0x3fff) return ppu.write(addr, data);
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if(addr <= 0x4017) return cpu.write(addr, data);
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}
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}
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