public void Lsr([Range(0x0, 0xF, 0x5)] int lowOperand, [Range(0x0, 0xF, 0x5)] int highOperand)
{
// Arrange
var operand = lowOperand + (highOperand << 4);
var expectedResult = operand >> 1;
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
var expectedOverflow = Cpu.V;
var expectedCarry = (operand & 0x01) != 0;
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(0x00)
.Returns(operand);
Cpu.SetOpcode(0x46);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must not be modified");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must be set correctly");
System.Verify(m => m.Write(0, operand));
System.Verify(m => m.Write(0, expectedResult));
}
public void Ora([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0x0, 0xF, 0x5)] int lowOperand, [Range(0x0, 0xF, 0x5)] int highOperand)
{
// Arrange
var a = lowA + (highA << 4);
var operand = lowOperand + (highOperand << 4);
var expectedResult = a | operand;
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
var expectedOverflow = Cpu.V;
var expectedCarry = Cpu.C;
Cpu.SetOpcode(0x09);
Cpu.SetA(a);
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(operand);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must not be modified");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must not be modified");
Cpu.A.Should().Be(expectedResult & 0xFF, "A must be set correctly");
}
public void AdcNoDecimal([Range(0x0, 0xC, 0x4)] int lowA, [Range(0x0, 0xC, 0x4)] int highA, [Range(0x0, 0xC, 0x4)] int lowOperand, [Range(0x0, 0xC, 0x4)] int highOperand, [Range(0, 1)] int c)
{
// Arrange
var a = lowA + (highA << 4);
var operand = lowOperand + (highOperand << 4);
var carry = c != 0;
var expectedResult = a + operand + (carry ? 1 : 0);
var expectedOverflow = ((a ^ expectedResult) & (a ^ operand) & 0x80) == 0;
var expectedCarry = (expectedResult & 0x100) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
var expectedSign = (expectedResult & 0x80) != 0;
Cpu.SetD(false);
Cpu.SetC(carry);
Cpu.SetA(a);
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(operand);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must be set correctly");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must be set correctly");
Cpu.A.Should().Be(expectedResult & 0xFF, "A must be set correctly");
}
public void RorA([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0, 1)] int carry)
{
// Arrange
var a = lowA + (highA << 4);
var expectedResult = (a >> 1) | (carry != 0 ? 0x80 : 0x00);
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
var expectedOverflow = Cpu.V;
var expectedCarry = (a & 0x01) != 0;
expectedResult &= 0xFF;
Cpu.SetA(a);
Cpu.SetOpcode(0x6A);
Cpu.SetC(carry != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must not be modified");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must be set correctly");
Cpu.A.Should().Be(expectedResult, "A must be set correctly");
}
public void Sei([Range(0, 1)] int i)
{
// Arrange
Cpu.SetOpcode(0x78);
Cpu.SetI(i != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.I.Should().BeTrue("I must be set");
}
public void Cli([Range(0, 1)] int i)
{
// Arrange
Cpu.SetOpcode(0x58);
Cpu.SetI(i != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.I.Should().BeFalse("I must be cleared");
}
public void Sec([Range(0, 1)] int c)
{
// Arrange
Cpu.SetOpcode(0x38);
Cpu.SetC(c != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.C.Should().BeTrue("C must be set");
}
public void Clc([Range(0, 1)] int c)
{
// Arrange
Cpu.SetOpcode(0x18);
Cpu.SetC(c != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.C.Should().BeFalse("C must be cleared");
}
public void Sed([Range(0, 1)] int d)
{
// Arrange
Cpu.SetOpcode(0xF8);
Cpu.SetD(d != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.D.Should().BeTrue("D must be set");
}
public void Clv([Range(0, 1)] int v)
{
// Arrange
Cpu.SetOpcode(0xB8);
Cpu.SetV(v != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().BeFalse("V must be cleared");
}
public void Cld([Range(0, 1)] int d)
{
// Arrange
Cpu.SetOpcode(0xD8);
Cpu.SetD(d != 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.D.Should().BeFalse("D must be cleared");
}
public void Tax([Random(0x00, 0x7F, 1)] int r0, [Random(0x80, 0xFF, 1)] int r1)
{
// Arrange
Cpu.SetA(r0);
Cpu.SetX(r1);
Cpu.SetOpcode(0xAA);
// Act
Cpu.ClockStep();
// Assert
Cpu.X.Should().Be(r0);
}
public void Bcc([Range(0x20, 0xE0, 0x40)] int offset, [Range(0x0000, 0xFFFF, 0x5555)] int pc, [Range(0, 1)] int carry)
{
// Arrange
Cpu.SetOpcode(0x90);
Cpu.SetC(carry != 0);
Cpu.SetPC(pc);
System.Setup(m => m.Read(It.IsAny <int>())).Returns(offset);
var expectedPc = CalculateBranch(pc, offset, carry == 0);
// Act
Cpu.ClockStep();
// Assert
Cpu.PC.Should().Be(expectedPc);
}
public void Cpx([Range(0x0, 0xF, 0x5)] int lowX, [Range(0x0, 0xF, 0x5)] int highX, [Range(0x0, 0xF, 0x5)] int lowData, [Range(0x0, 0xF, 0x5)] int highData)
{
// Arrange
var x = lowX + (highX << 4);
var data = lowData + (highData << 4);
Cpu.SetX(x);
Cpu.SetOpcode(0xE0);
System.Setup(m => m.Read(It.IsAny <int>())).Returns(data);
// Act
Cpu.ClockStep();
// Assert
Console.WriteLine("X=${0:x2}; CPX #${1:x2}", x, data);
Cpu.X.Should().Be(x, "X must not be modified");
CompareFlags(x, data);
}
public void Cpy([Range(0x0, 0xF, 0x5)] int lowY, [Range(0x0, 0xF, 0x5)] int highY, [Range(0x0, 0xF, 0x5)] int lowData, [Range(0x0, 0xF, 0x5)] int highData)
{
// Arrange
var y = lowY + (highY << 4);
var data = lowData + (highData << 4);
Cpu.SetY(y);
Cpu.SetOpcode(0xC0);
System.Setup(m => m.Read(It.IsAny <int>())).Returns(data);
// Act
Cpu.ClockStep();
// Assert
Console.WriteLine("Y=${0:x2}; CPY #${1:x2}", y, data);
Cpu.Y.Should().Be(y, "Y must not be modified");
CompareFlags(y, data);
}
public void Cmp([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0x0, 0xF, 0x5)] int lowData, [Range(0x0, 0xF, 0x5)] int highData)
{
// Arrange
var a = lowA + (highA << 4);
var data = lowData + (highData << 4);
Cpu.SetA(a);
Cpu.SetOpcode(0xC9);
System.Setup(m => m.Read(It.IsAny <int>())).Returns(data);
// Act
Cpu.ClockStep();
// Assert
Console.WriteLine("A=${0:x2}; CMP #${1:x2}", a, data);
Cpu.A.Should().Be(a, "A must not be modified");
CompareFlags(a, data);
}
public void SbcDecimal([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0x0, 0xF, 0x5)] int lowOperand, [Range(0x0, 0xF, 0x5)] int highOperand, [Range(0, 1)] int c)
{
// Arrange
var a = lowA + (highA << 4);
var operand = lowOperand + (highOperand << 4);
var carry = c != 0;
var temp = a - operand - (carry ? 0 : 1);
var temp2 = (a & 0xF) - (operand & 0xF) - (carry ? 0 : 1);
if ((temp2 & 0x10) != 0)
{
temp2 = ((temp2 - 6) & 0xF) | ((a & 0xF0) - (operand & 0xF0) - 0x10);
}
else
{
temp2 = (temp2 & 0xF) | ((a & 0xF0) - (operand & 0xF0));
}
if ((temp2 & 0x100) != 0)
{
temp2 -= 0x60;
}
var expectedCarry = temp >= 0;
var expectedZero = (temp & 0xFF) == 0;
var expectedSign = (temp & 0x80) != 0;
var expectedOverflow = ((a ^ temp) & (a ^ operand) & 0x80) != 0;
var expectedResult = temp2 & 0xFF;
Cpu.SetD(true);
Cpu.SetC(carry);
Cpu.SetA(a);
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(operand);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must be set correctly");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must be set correctly");
Cpu.A.Should().Be(expectedResult & 0xFF, "A must be set correctly");
}
public void AdcDecimal([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0x0, 0xF, 0x5)] int lowOperand, [Range(0x0, 0xF, 0x5)] int highOperand, [Range(0, 1)] int c)
{
// Arrange
var a = lowA + (highA << 4);
var operand = lowOperand + (highOperand << 4);
var carry = c != 0;
var lowTemp = lowA + lowOperand + c;
if (lowTemp > 9)
{
lowTemp += 6;
}
var highTemp = highA + highOperand + (lowTemp > 0xF ? 1 : 0);
var temp = (lowTemp & 0xF) + (highTemp << 4);
var expectedZero = ((a + operand + c) & 0xFF) == 0;
var expectedSign = (temp & 0x80) != 0;
var expectedOverflow = ((a ^ temp) & (a ^ operand) & 0x80) == 0;
if (temp > 0x99)
{
temp += 96;
}
var expectedCarry = temp > 0x99;
var expectedResult = temp & 0xFF;
Cpu.SetD(true);
Cpu.SetC(carry);
Cpu.SetA(a);
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(operand);
// Act
Cpu.ClockStep();
// Assert
Cpu.V.Should().Be(expectedOverflow, "V must be set correctly");
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.C.Should().Be(expectedCarry, "C must be set correctly");
Cpu.A.Should().Be(expectedResult & 0xFF, "A must be set correctly");
}
public void Dex([Range(0x0, 0xF, 0x5)] int lowX, [Range(0x0, 0xF, 0x5)] int highX)
{
// Arrange
var x = lowX + (highX << 4);
var expectedResult = (x - 1);
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
expectedResult &= 0xFF;
Cpu.SetOpcode(0xCA);
Cpu.SetX(x);
// Act
Cpu.ClockStep();
// Assert
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.X.Should().Be(expectedResult, "X must be set correctly");
}
public void Dey([Range(0x0, 0xF, 0x5)] int lowY, [Range(0x0, 0xF, 0x5)] int highY)
{
// Arrange
var y = lowY + (highY << 4);
var expectedResult = (y - 1);
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
expectedResult &= 0xFF;
Cpu.SetOpcode(0x88);
Cpu.SetY(y);
// Act
Cpu.ClockStep();
// Assert
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
Cpu.Y.Should().Be(expectedResult, "Y must be set correctly");
}
public void Bit([Range(0x0, 0xF, 0x5)] int lowA, [Range(0x0, 0xF, 0x5)] int highA, [Range(0x0, 0xF, 0x5)] int lowData, [Range(0x0, 0xF, 0x5)] int highData)
{
// Arrange
var a = lowA + (highA << 4);
var data = lowData + (highData << 4);
var expectedN = (data & 0x80) != 0;
var expectedV = (data & 0x40) != 0;
var expectedZ = (data & a) == 0;
System.Setup(m => m.Read(It.IsAny <int>())).Returns(data);
Cpu.SetA(a);
// Act
Cpu.ClockStep();
// Assert
Cpu.A.Should().Be(a);
Cpu.N.Should().Be(expectedN);
Cpu.V.Should().Be(expectedV);
Cpu.Z.Should().Be(expectedZ);
}
public void Dec([Range(0x0, 0xF, 0x5)] int lowOperand, [Range(0x0, 0xF, 0x5)] int highOperand)
{
// Arrange
var operand = lowOperand + (highOperand << 4);
var expectedResult = (operand - 1);
var expectedSign = (expectedResult & 0x80) != 0;
var expectedZero = (expectedResult & 0xFF) == 0;
expectedResult &= 0xFF;
System.SetupSequence(m => m.Read(It.IsAny <int>()))
.Returns(0x00)
.Returns(operand);
Cpu.SetOpcode(0xC6);
// Act
Cpu.ClockStep();
// Assert
Cpu.Z.Should().Be(expectedZero, "Z must be set correctly");
Cpu.N.Should().Be(expectedSign, "N must be set correctly");
System.Verify(m => m.Write(0, operand));
System.Verify(m => m.Write(0, expectedResult));
}