As your question directly relates to this question, i'll leave it here. Once you become more familiar with how the forum works, you will learn that it is best to start a new topic rather than reply to a topic that has been dormant for 2 years. You can include a link to the earlier topic in your new post.
Note that both records are put into the 160 bytes. The check of pos 81 is to see if there is data or not.