To my knowledge HD-A1 and HD-A1SN should be the same. Toshiba has some strange glossary with the products.
I own the HD-E1 (European Version) which - according to package and the back of the player - is called HD-E1KTE.

To cut a long story short: The codes you can find in the file base *should* work.

What is not working? Not response at all or no correct behaviour? Did you try to adjust the duration?