You're not so much into thorough research, or are you?
Here's the link:
http://en.wikipedia.org/wiki/Code39#Full_ASCII_Code_39[
^]
And here is the explanation on how to use the information you'll find on that page.
- Click on the link I provided above.
- Read the short paragraph above that nice table. Just to make sure read it again and for good meausre read it a third time.
- Now have a good long look at the table.
- Pay special attention to the column named Encoding.
- You already know Code 39 as you stated in your question so you're almost done now.
- Look up the ASCII character you want to encode in Code 39 Full ASCII and take note of the two characters in column Encoding.
- Now encode the each of the two characters from column Encoding with the plain Code 39, the one you already know.
- Done! You can now encode in Code 39 Full ASCII, congratulations.
Best,
— Manfred