mirror of https://github.com/bsnes-emu/bsnes.git
58 lines
1.3 KiB
C++
Executable File
58 lines
1.3 KiB
C++
Executable File
struct KonamiVRC2 : Board {
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struct Settings {
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struct Pinout {
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unsigned a0;
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unsigned a1;
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} pinout;
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} settings;
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VRC2 vrc2;
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uint8 prg_read(unsigned addr) {
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if(addr < 0x6000) return cpu.mdr();
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if(addr < 0x8000) return vrc2.ram_read(addr);
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return prgrom.read(vrc2.prg_addr(addr));
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}
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void prg_write(unsigned addr, uint8 data) {
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if(addr < 0x6000) return;
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if(addr < 0x8000) return vrc2.ram_write(addr, data);
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bool a0 = (addr & settings.pinout.a0);
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bool a1 = (addr & settings.pinout.a1);
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addr &= 0xfff0;
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addr |= (a0 << 0) | (a1 << 1);
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return vrc2.reg_write(addr, data);
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}
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uint8 chr_read(unsigned addr) {
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if(addr & 0x2000) return ppu.ciram_read(vrc2.ciram_addr(addr));
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return Board::chr_read(vrc2.chr_addr(addr));
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}
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void chr_write(unsigned addr, uint8 data) {
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if(addr & 0x2000) return ppu.ciram_write(vrc2.ciram_addr(addr), data);
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return Board::chr_write(vrc2.chr_addr(addr), data);
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}
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void power() {
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vrc2.power();
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}
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void reset() {
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vrc2.reset();
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}
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void serialize(serializer &s) {
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Board::serialize(s);
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vrc2.serialize(s);
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}
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KonamiVRC2(Markup::Node &document) : Board(document), vrc2(*this) {
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settings.pinout.a0 = 1 << decimal(document["cartridge"]["chip"]["pinout"]["a0"].data);
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settings.pinout.a1 = 1 << decimal(document["cartridge"]["chip"]["pinout"]["a1"].data);
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}
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};
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