mirror of https://github.com/bsnes-emu/bsnes.git
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
//NES-UNROM
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//NES-UOROM
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struct NES_UxROM : Board {
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NES_UxROM(Markup::Node& document) : Board(document) {
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settings.mirror = document["board/mirror/mode"].text() == "vertical" ? 1 : 0;
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}
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auto prg_read(uint addr) -> uint8 {
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if((addr & 0xc000) == 0x8000) return prgrom.read((prg_bank << 14) | (addr & 0x3fff));
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if((addr & 0xc000) == 0xc000) return prgrom.read(( 0x0f << 14) | (addr & 0x3fff));
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return cpu.mdr();
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}
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auto prg_write(uint addr, uint8 data) -> void {
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if(addr & 0x8000) prg_bank = data & 0x0f;
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}
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auto chr_read(uint addr) -> uint8 {
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if(addr & 0x2000) {
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if(settings.mirror == 0) addr = ((addr & 0x0800) >> 1) | (addr & 0x03ff);
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return ppu.ciram_read(addr);
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}
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return Board::chr_read(addr);
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}
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auto chr_write(uint addr, uint8 data) -> void {
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if(addr & 0x2000) {
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if(settings.mirror == 0) addr = ((addr & 0x0800) >> 1) | (addr & 0x03ff);
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return ppu.ciram_write(addr, data);
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}
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return Board::chr_write(addr, data);
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}
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auto power() -> void {
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}
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auto reset() -> void {
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prg_bank = 0;
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}
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auto serialize(serializer& s) -> void {
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Board::serialize(s);
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s.integer(prg_bank);
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}
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struct Settings {
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bool mirror; //0 = horizontal, 1 = vertical
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} settings;
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uint4 prg_bank;
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};
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