public void Immediate()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdxImmediate);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 41);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(41, cpu.X);
}
public void NegativeFlagNotSet()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdxImmediate);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 127);
// Act
cpu.Execute();
// Assert
Assert.IsFalse(cpu.NegativeFlag);
}
public void StyZeroPage()
{
Cpu cpu = new Cpu();
cpu.Y = 0x10;
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.StyZeroPage);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0xF);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x10, cpu.Ram.ReadByte(0xF));
}
public void StyAbsolute()
{
Cpu cpu = new Cpu();
cpu.Y = 0xF0;
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.StyAbsolute);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x20);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 2), 0x30);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0xF0, cpu.Ram.ReadByte(0x3020));
}
public void ZeroPage()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(0xF, 0x40);
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.IncZeroPage);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0xF);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x41, cpu.Ram.ReadByte(0xF));
}
public void Absolute()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(0x2310, 0x5);
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdxAbsolute);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x10);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 2), 0x23);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x5, cpu.X);
}
public void Absolute()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(0x2030, 0x40);
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.IncAbsolute);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x30);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 2), 0x20);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x41, cpu.Ram.ReadByte(0x2030));
}
public void StaIndirectX()
{
Cpu cpu = new Cpu();
cpu.A = 0xF0;
cpu.X = 0x1;
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.StaIndirectX);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x10);
cpu.Ram.WriteByte(0x11, 0x20);
cpu.Ram.WriteByte(0x12, 0x30);
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0xF0, cpu.Ram.ReadByte(0x3020));
}
public void ZeroPageY()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(0x1F, 0x5);
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdxZeroPageY);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x1E);
cpu.Y = 0x1;
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x5, cpu.X);
}
public void ZeroFlagSet()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdxImmediate);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0);
// Act
cpu.Execute();
// Assert
Assert.IsTrue(cpu.ZeroFlag);
}
public void IndirectX()
{
// Arrange
Cpu cpu = new Cpu();
cpu.Ram.WriteByte(0x1C, 0x10);
cpu.Ram.WriteByte(0x1D, 0x23);
cpu.Ram.WriteByte(0x1E, 0x45);
cpu.Ram.WriteByte(0x4523, 0x78);
cpu.Ram.WriteByte(cpu.ProgramCounter, Mnemonic.LdaIndirectX);
cpu.Ram.WriteByte((Int16)(cpu.ProgramCounter + 1), 0x1C);
cpu.X = 0x1;
// Act
cpu.Execute();
// Assert
Assert.AreEqual(0x78, cpu.A);
}