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added cartridge loading

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This commit is contained in:
Lauchmelder 2021-10-20 23:11:08 +02:00
parent 5aa8a64871
commit abb9b2e54a
5 changed files with 68 additions and 6 deletions
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8
NES Emulator/bus.c
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@ -26,7 +26,7 @@ struct Bus* createBus()
bus->cpu = createCPU(bus);
// Create and insert cartridge
bus->cartridge = createCartridge(bus, "nestest.nes");
bus->cartridge = createCartridge(bus, "roms/nestest.nes");
return bus;
}
@ -42,10 +42,12 @@ void destroyBus(struct Bus* bus)
Byte Read(struct Bus* bus, Word addr)
{
Byte val = 0;
// Return from the appropriate device depending on the address
if (addr <= 0x1FFF) // RAM (or one of the mirrored addresses)
{
return bus->ram[addr & 0x7FF];
val = bus->ram[addr & 0x7FF];
}
else if (0x4020 <= addr && addr <= 0xFFFF) // Cartridge space
{
@ -56,6 +58,8 @@ Byte Read(struct Bus* bus, Word addr)
fprintf(stderr, "Access violation at $%x", addr);
exit(1);
}
return val;
}
void Write(struct Bus* bus, Word addr, Byte val)