MCS-51. Реализация ЦАП, который бы выводил синусоиду

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace Sine
{
    public partial class Form1 : Form
    {
        double X, Y=127, X_old, Y_old=127, line=127;
        byte[] sinus;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }
 
        private void timer1_Tick(object sender, EventArgs e)
        {           
                for (int i = 0; X <= 255; i++, X++)
                {
sinus = new byte[256] 
{127,130,133,136,139,142,145,148,151,154,157,160,164,166,169,172,175,178,181,184,187,189,192,195, 197,200,202,205,
207,210,212,214,217,219,221,223,225,227,229,231,232,234,236,237,239,240,242,243, 244,245,246,247,248,249, 250,251,
251,252,252,253,253,253,253,
 
253,254,253,253,253,253,252,252,251, 251,250,249,249,248,247,246,245,243,242,241,239,
238,236,235,233,231,230, 228,226,224,222,220,218, 215,213,211,209,206,204,201,199,196,193,191,188,185,182,180,177,
174,171,168,165,162,159,156,153, 150,147,144,141,137,134,131,128,
 
125,122,119,116,112,109,106,103,100,97,94,91,88,
85,82,79,76, 73,71,68,65,62,60,57,54,52,49,47,44,42,40,38,35,33,31,29,27,25,23,22,20,18,17,15,14, 12,11,10,8,7,6,5,
4,4,3,2,2,1,1,0,0,0,0,0,0,
 
0,0,0,0,1,1,2,2,3,4,5,6,7,8,9,10,11,13,14,16,17,19,21,22,24, 26,28,30,32,34,36,39,41,43,46,
48,51,53,56,58,61,64,66,69,72,75,78,81,84,87,89,93,96, 99,102,105,108,111,114,117,120,123,127};
 
                    Y = sinus[i];
 
                    Graphics graph = pictureBox1.CreateGraphics();
                    Pen pen_black = new Pen(Brushes.Black, 2);
                    Pen pen_red = new Pen(Brushes.Red, 1);
 
                    graph.DrawLine(pen_red, 0, (float)(pictureBox1.Size.Height - line), pictureBox1.Size.Width, (float)(pictureBox1.Size.Height - line));
                    graph.DrawLine(pen_black, (float)X_old, (float)(pictureBox1.Size.Height - Y_old), (float)X, (float)(pictureBox1.Size.Height - Y));
 
                    if (X >= pictureBox1.Size.Width)
                    {
                        pictureBox1.Image = null;
                        X = 0;
                    }
 
                    X_old = X;
                    Y_old = Y;
 
                    label1.Text = Y.ToString();
                    label2.Text = X.ToString();
                }            
        }
    }
}

                Y = (int)(127 + 127 * Math.Sin(3.14 * X * 0.08695652173)); // 2*(1/23) = 0.08695652173