Hi Barbera, I don't know anything about the A9m flash unit, but if you have an Olympus XA camera then you can definately use either the A11 or A16 flash units. The A16 is more powerful but I've never seen one for sale anywhere, you mighr be able to find an A11 or A16 on Ebay. Hope this helps, goodluck.
Stu 6 Jan 07