public void PLAShouldPullStackValueInAccumulator()
{
byte value = 0x42;
cpu.A = 0x00;
cpu.PushOnStack(value);
byte[] instructions = new byte[]
{
0x68 // PLA
};
InitializeMemory(instructions);
// Act
cpu.Execute(1);
// Assert
Assert.AreEqual <byte>(value, cpu.A, "Accumulator should get value from stack after PLA.");
}
public void RTIShouldRestorePreInterruptState()
{
cpu.PC = 0x0201; // Use different address than 0x0200, because high and low byte of address would be same 0x0202
memory[0x0201] = 0x40; // RTI instruction
byte processorStatus = 0x72;
cpu.PushOnStack(0x13);
cpu.PushOnStack(0x37);
cpu.PushOnStack(processorStatus);
// Act
cpu.Execute(1);
// Assert
Assert.AreEqual <ushort>(0x1337, cpu.PC, "Program counter is not restored to correct address.");
Assert.AreEqual <byte>(processorStatus, cpu.ProcessorStatus, "Processor status is not restored.");
}