There is a Texas Confederate pension record on file for a man named James A. Boyd
Name: Boyd, James A.
Texas doesn't list what unit these applicants served with online so as Gary said you should order his pension records and see if this is your man. If this is the right James A. Boyd the pension application should answer your questions and provide some good information. Since you stated he was on the last roll on April 1864 I assume you have his service record. If not, you can order those as well. Just follow the link Gary listed.