public override byte Read(byte value, ushort address)
{
switch (address)
{
case 0x5010:
value = 0;
value |= (byte)(interrupt ? 0x80 : 0x00);
irqTrip = false;
break;
case 0x5015:
value = 0;
value |= square1.Read(0, 0);
value |= (byte)(square2.Read(0, 0) << 1);
break;
}
if (readMode && address >= 0x8000 && address <= 0xBFFF)
{
if (value == 0)
{
irqTrip = true;
}
else
{
nes.APU.Update();
pcmData = value;
}
}
return(value);
}
public byte Read()
{
byte nextByte = 0;
nextByte |= square1.Read(0, 0);
nextByte |= (byte)(square2.Read(0, 0) << 1);
nextByte |= (byte)(triangle.Read(0, 0) << 2);
nextByte |= (byte)(noise.Read(0, 0) << 3);
nextByte |= dmc.Read(0, 0);
if (frameIRQ)
{
nextByte |= 0x40;
}
frameIRQ = false;
return(nextByte);
}