private void previousPageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            switch (DisplayMode)
            {
            case DisplayMode.Disassembly:
                if (DisassemblyStepSize.Count > 0)
                {
                    var step = DisassemblyStepSize.Pop();
                    if (DisplayPointer.CanDec(step))
                    {
                        DisplayPointer.Dec(step);
                    }
                }
                break;

            default:
                if (DisplayPointer.CanDec(StepSize))
                {
                    DisplayPointer.Dec(StepSize);
                }
                else
                {
                    DisplayPointer.FromInt(0);
                }
                break;
            }
            RenderScreen();
        }
 private void previousByteToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (DisplayMode == DisplayMode.Disassembly)
     {
         return;
     }
     if (DisplayPointer.CanDec(1))
     {
         DisplayPointer.Dec(1);
     }
     else
     {
         DisplayPointer.FromInt(0);
     }
     RenderScreen();
 }