public void ROL_AbsoluteX_ApplyCarry()
{
var mapper = new NROM(new byte[] { 0x3E, 0x02, 0xC0, 0xFF }, null);
var cpu = new Core(mapper)
{
X = 1
};
cpu.Status.Carry = true;
cpu.Tick();
//Verify Registers
//Not modified
//Verify Cycles
Assert.AreEqual(7u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(true, cpu.Status.Negative);
//Verify Memory Values
Assert.AreEqual(0xFF, cpu.CPUMemory.ReadByte(0xC003));
//Verify Stack
//Not modified
}
public void CMP_IndirectIndexed_PageBoundary_Carry_Zero()
{
var mapper = new NROM(new byte[] { 0xD1, 0x00 }, null);
var cpu = new Core(mapper)
{
A = 0x7E, Y = 1
};
cpu.CPUMemory.WriteByte(0x00, 0xFF);
cpu.CPUMemory.WriteByte(0x01, 0x00);
cpu.CPUMemory.WriteByte(0x100, 0x7E);
cpu.Tick();
//Verify Register Values
Assert.AreEqual(0x7E, cpu.A);
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Zero);
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void PHP_Implied()
{
var mapper = new NROM(new byte[] { 0x08 }, null);
var cpu = new Core(mapper);
//Set all statuses to true
cpu.Status.Zero = true;
cpu.Status.Carry = true;
cpu.Status.DecimalMode = true;
cpu.Status.InterruptDisable = true;
cpu.Status.Negative = true;
cpu.Status.Overflow = true;
cpu.Tick();
//Verify Registers
//Not Modified
//Verify Cycles
Assert.AreEqual(3u, cpu.Cycles);
//Verify Flags
//Not Modified
//Verify Stack
Assert.AreEqual(0xFF, cpu.CPUMemory.ReadByte(Core.STACK_BASE + cpu.SP + 1));
}
public void ROL_Accumulator_SetCarry()
{
var mapper = new NROM(new byte[] { 0x2A }, null);
var cpu = new Core(mapper)
{
A = 0xFF
};
cpu.Status.Carry = false;
cpu.Tick();
//Verify Registers
Assert.AreEqual(0xFE, cpu.A);
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(true, cpu.Status.Negative);
//Verify Stack
//Not modified
}
public void LSR_ZeroPageX_Clear()
{
var mapper = new NROM(new byte[] { 0x56, 0x00 }, null);
var cpu = new Core(mapper)
{
X = 1
};
cpu.CPUMemory.WriteByte(0x01, 0x80);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x80, cpu.CPUMemory.ReadByte(0x01));
Assert.AreEqual(0x40, cpu.CPUMemory.ReadByte(0x01));
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Carry);
}
public void ORA_IndirectIndexed_Negative()
{
var mapper = new NROM(new byte[] { 0x11, 0x00 }, null);
var cpu = new Core(mapper)
{
A = 0xAA, Y = 1
};
cpu.CPUMemory.WriteByte(0x00, 0x01);
cpu.CPUMemory.WriteByte(0x01, 0x00);
cpu.CPUMemory.WriteByte(0x02, 0x55);
cpu.Tick();
//Verify Register Values
Assert.AreNotEqual(0xAA, cpu.A);
Assert.AreEqual(0xFF, cpu.A);
//Verify Cycles
Assert.AreEqual(5u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(true, cpu.Status.Negative);
}
public void BCC_CarryClear_PageBoundary()
{
var mapper = new NROM(new byte[] { 0x00 }, null);
var cpu = new Core(mapper);
cpu.CPUMemory.WriteByte(0xF0, 0x90);
cpu.CPUMemory.WriteByte(0xF1, 0x79);
cpu.CPUMemory.WriteByte(0xF2, 0x00);
cpu.Status.Carry = false;
cpu.PC = 0xF0;
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x00, cpu.PC);
Assert.AreEqual(0x16B, cpu.PC); //0xF0 + 0x79 + 2 bytes for instruction
//Verify Cycles
Assert.AreEqual(4u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void PLA_Implied()
{
//Test Program
// PHA -- Pushes value of 1 to stack
// LDA 0x00 -- Loads 0x00 into the accumulator
// PLA -- Pops the value of 1 from stack to accumulator
var mapper = new NROM(new byte[] { 0x48, 0xA9, 0x00, 0x68 }, null);
var cpu = new Core(mapper)
{
A = 0x01
};
var test = new byte[] { };
cpu.Tick(3);
//Verify Registers
//Not Modified
//Verify Cycles
Assert.AreEqual(9u, cpu.Cycles);
//Verify Flags
//Not Modified
//Verify Stack
Assert.AreEqual(0x01, cpu.A);
}
public void ROR_Accumulator_Negative_ApplyCarry()
{
var mapper = new NROM(new byte[] { 0x6A }, null);
var cpu = new Core(mapper)
{
A = 0x00
};
cpu.Status.Carry = true;
cpu.Tick();
//Verify Registers
Assert.AreEqual(0x80, cpu.A);
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Carry);
Assert.AreEqual(true, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Zero);
//Verify Stack
//Not modified
}
public void ROR_ZeroPageX_SetCarry()
{
var mapper = new NROM(new byte[] { 0x76, 0x00 }, null);
var cpu = new Core(mapper)
{
X = 1
};
cpu.CPUMemory.WriteByte(0x01, 0x03);
cpu.Tick();
//Verify Registers
//Not modified
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Zero);
//Verify Memory Values
Assert.AreEqual(0x01, cpu.CPUMemory.ReadByte(0x01));
//Verify Stack
//Not modified
}
public void ROR_Absolute_SetNegative_ApplyCarry()
{
var mapper = new NROM(new byte[] { 0x6E, 0x03, 0xC0, 0x00 }, null);
var cpu = new Core(mapper);
cpu.Status.Carry = true;
cpu.Tick();
//Verify Registers
//Not modified
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Carry);
Assert.AreEqual(true, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Zero);
//Verify Memory Values
Assert.AreEqual(0x80, cpu.CPUMemory.ReadByte(0xC003));
//Verify Stack
//Not modified
}
public void ROR_AbsoluteX_Clear()
{
var mapper = new NROM(new byte[] { 0x7E, 0x02, 0xC0, 0x02 }, null);
var cpu = new Core(mapper)
{
X = 1
};
cpu.Tick();
//Verify Registers
//Not modified
//Verify Cycles
Assert.AreEqual(7u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Zero);
//Verify Memory Values
Assert.AreEqual(0x01, cpu.CPUMemory.ReadByte(0xC003));
//Verify Stack
//Not modified
}
public void LDA_IndirectIndexed_BigY_PageBoundary_Clear()
{
var mapper = new NROM(new byte[] { 0xB1, 0x00 }, null);
var cpu = new Core(mapper)
{
Y = 3
};
cpu.CPUMemory.WriteByte(0x00, 0xFE);
cpu.CPUMemory.WriteByte(0x01, 0x00);
cpu.CPUMemory.WriteByte(0x101, 0x01);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x00, cpu.A);
Assert.AreEqual(0x01, cpu.A);
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void EOR_IndexedIndirect_Zero()
{
var mapper = new NROM(new byte[] { 0x41, 0x00 }, null);
var cpu = new Core(mapper)
{
A = 0xFF, X = 1
};
cpu.CPUMemory.WriteByte(0x00, 0x00);
cpu.CPUMemory.WriteByte(0x01, 0x03);
cpu.CPUMemory.WriteByte(0x02, 0x00);
cpu.CPUMemory.WriteByte(0x03, 0xFF);
cpu.Tick();
//Verify Register Values
Assert.AreNotEqual(0xFF, cpu.A);
Assert.AreEqual(0x00, cpu.A);
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void ROL_ZeroPage_ApplyCarry()
{
var mapper = new NROM(new byte[] { 0x26, 0x00 }, null);
var cpu = new Core(mapper);
cpu.CPUMemory.WriteByte(0x00, 0xFF);
cpu.Status.Carry = true;
cpu.Tick();
//Verify Registers
//Not modified
//Verify Cycles
Assert.AreEqual(5u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(true, cpu.Status.Negative);
//Verify Memory Values
Assert.AreEqual(0xFF, cpu.CPUMemory.ReadByte(0x00));
//Verify Stack
//Not modified
}
public void NOP_Implied()
{
var mapper = new NROM(new byte[] { 0xEA }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
}
public void JMP_Indirect_PageBoundaryBug()
{
var mapper = new NROM(new byte[] { 0x6C, 0xFF, 0xC0 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Register Values
Assert.AreNotEqual(0x00, cpu.PC);
Assert.AreEqual(0x6C00, cpu.PC);
//Verify Cycles
Assert.AreEqual(5u, cpu.Cycles);
}
public void JMP_Absolute()
{
var mapper = new NROM(new byte[] { 0x4C, 0x0F, 0xC0 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Register Values
Assert.AreNotEqual(0xC000, cpu.PC);
Assert.AreEqual(0xC00F, cpu.PC);
//Verify Cycles
Assert.AreEqual(3u, cpu.Cycles);
}
public void CLV_Overflow()
{
var mapper = new NROM(new byte[] { 0xB8 }, null);
var cpu = new Core(mapper);
cpu.Status.Overflow = true;
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Overflow);
}
public void CLC_Carry()
{
var mapper = new NROM(new byte[] { 0x18 }, null);
var cpu = new Core(mapper);
cpu.Status.Carry = true;
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Carry);
}
public void CLI_Interrupt()
{
var mapper = new NROM(new byte[] { 0x58 }, null);
var cpu = new Core(mapper);
cpu.Status.InterruptDisable = true;
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.InterruptDisable);
}
public void CLD_Decimal()
{
var mapper = new NROM(new byte[] { 0xD8 }, null);
var cpu = new Core(mapper);
cpu.Status.DecimalMode = true;
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.DecimalMode);
}
public void BNE_ZeroClear()
{
var mapper = new NROM(new byte[] { 0xD0, 0x0A, 0x00 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0xC000, cpu.PC);
Assert.AreEqual(0xC00C, cpu.PC);
//Verify Cycles
Assert.AreEqual(3u, cpu.Cycles);
//Verify Flags
//Not Modified
}
public void LDX_Immediate_Negative()
{
var mapper = new NROM(new byte[] { 0xA2, 0x80 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x00, cpu.X);
Assert.AreEqual(0x80, cpu.X);
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(true, cpu.Status.Negative);
}
public void LDX_Absolute_Clear()
{
var mapper = new NROM(new byte[] { 0xAE, 0x03, 0xC0, 0x01 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x00, cpu.X);
Assert.AreEqual(0x01, cpu.X);
//Verify Cycles
Assert.AreEqual(4u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void INC_Absolute_Zero()
{
var mapper = new NROM(new byte[] { 0xEE, 0x03, 0xC0, 0xFF }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0xFF, cpu.CPUMemory.ReadByte(0xC003));
Assert.AreEqual(0x00, cpu.CPUMemory.ReadByte(0xC003));
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(true, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
}
public void CPY_Absolute_Carry()
{
var mapper = new NROM(new byte[] { 0xCC, 0x03, 0xC0, 0x7E }, null);
var cpu = new Core(mapper)
{
Y = 0x7F
};
cpu.Tick();
//Verify Cycles
Assert.AreEqual(4u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Zero);
}
public void CPX_Immediate_Carry()
{
var mapper = new NROM(new byte[] { 0xE0, 0x7E }, null);
var cpu = new Core(mapper)
{
X = 0x7F
};
cpu.Tick();
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(true, cpu.Status.Carry);
Assert.AreEqual(false, cpu.Status.Zero);
}
public void BVS_OverflowClear()
{
var mapper = new NROM(new byte[] { 0x70, 0x0A, 0x00 }, null);
var cpu = new Core(mapper);
cpu.Status.Overflow = false;
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0xC000, cpu.PC);
Assert.AreEqual(0xC002, cpu.PC);
//Verify Cycles
Assert.AreEqual(2u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Overflow);
}
public void LSR_Absolute_Clear()
{
var mapper = new NROM(new byte[] { 0x4E, 0x03, 0xC0, 0x80 }, null);
var cpu = new Core(mapper);
cpu.Tick();
//Verify Memory Values
Assert.AreNotEqual(0x80, cpu.CPUMemory.ReadByte(0xC003));
Assert.AreEqual(0x40, cpu.CPUMemory.ReadByte(0xC003));
//Verify Cycles
Assert.AreEqual(6u, cpu.Cycles);
//Verify Flags
Assert.AreEqual(false, cpu.Status.Zero);
Assert.AreEqual(false, cpu.Status.Negative);
Assert.AreEqual(false, cpu.Status.Carry);
}