/// <summary>
/// Calculates answer and writes this into the Accumulator. Pulls data from bus hence falling.
/// </summary>
private void ClockFallingHandler()
{
if (_aluMode != ALUModes.None) // save execution time in case of no op.
{
var busValue = BitConverter.ToInt16(_bus.Read(), 0);
var accValue = BitConverter.ToInt16(_acc.Value, 0);
switch (_aluMode)
{
case ALUModes.Increment:
_acc.Value = BitConverter.GetBytes(busValue += 1);
break;
case ALUModes.IncrementWord:
_acc.Value = BitConverter.GetBytes(busValue += 2);
break;
case ALUModes.Add:
_acc.Value = BitConverter.GetBytes(busValue + accValue);
break;
case ALUModes.Subtract:
_acc.Value = BitConverter.GetBytes(accValue - busValue);
break;
}
}
_aluMode = 0; // Reset flags.
}
public void SetMode(ALUModes mode)
{
_aluMode = mode;
}