mirror of https://github.com/bsnes-emu/bsnes.git
54 lines
1.2 KiB
C++
Executable File
54 lines
1.2 KiB
C++
Executable File
#ifdef CARTRIDGE_CPP
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uint8 Cartridge::MBC5::mmio_read(uint16 addr) {
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if((addr & 0xc000) == 0x0000) { //$0000-3fff
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return cartridge.rom_read(addr);
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}
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if((addr & 0xc000) == 0x4000) { //$4000-7fff
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return cartridge.rom_read((rom_select << 14) | (addr & 0x3fff));
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram_enable) return cartridge.ram_read((ram_select << 13) | (addr & 0x1fff));
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return 0x00;
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}
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return 0x00;
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}
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void Cartridge::MBC5::mmio_write(uint16 addr, uint8 data) {
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if((addr & 0xe000) == 0x0000) { //$0000-1fff
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ram_enable = (data & 0x0f) == 0x0a;
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return;
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}
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if((addr & 0xf000) == 0x2000) { //$2000-2fff
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rom_select = (rom_select & 0x0100) | data;
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return;
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}
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if((addr & 0xf000) == 0x3000) { //$3000-3fff
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rom_select = ((data & 1) << 8) | (rom_select & 0x00ff);
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return;
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}
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if((addr & 0xe000) == 0x4000) { //$4000-5fff
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ram_select = data & 0x0f;
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return;
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram_enable) cartridge.ram_write((ram_select << 13) | (addr & 0x1fff), data);
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return;
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}
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}
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void Cartridge::MBC5::power() {
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ram_enable = false;
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rom_select = 0x001;
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ram_select = 0x00;
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}
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#endif
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