Illusionists in 2E are simply specialist Mages, they use the same spells and so on. They get the usual 2E specialist benefits for their school of magic. (I have the 2E PHB, so I know this is correct.)
Edit:
I looked at the Wizards of the Coast old edition downloads, nearly everything there was 2E. There was not a lot that was useful here,
http://www.wizards.com/default.asp?x=dnd/dnd/downloads