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