byte[] mapData = ReadROM(ofd.FileName, map1, 1024); // read the first map (1024 bytes)

        byte[,] map = new byte[32, 32];
        int count = 0;

        for (int i = 0; i < 32; i++)
        {
            for (int j = 0; j < 32; j++)
            {
                map[j, i] = mapData[count++];
            }
        }

        // display the map in the textbox
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 32; i++)
        {
            for (int j = 0; j < 32; j++)
            {
                sb.AppendFormat("{0:x2} ", map[j, i]);
            }
            sb.AppendLine();
        }

        textBox1.Text = sb.ToString();
    }
}