IIRC they changed from a belt to a chain in 93~94.
Actually, they changed from a belt to a chain in 1998, as 1998 they went away from the AFE engines to the 1ZZ-FE.
Both the 4AFE and 7AFE in all previous gen Corollas are non interference, with timing belt intervals of 60,000 miles per the owners manual.
When I did my 94 at 140,000 miles though, the belt, with 60,000 miles, was still in perfect condition.
"Actually, they changed from a belt to a chain in 1998"
That sounds about right. I know it happened somewhere in there. I had a 91, and I remember someone with a newer one complaining that it wasn't as smooth because of the chain, Toyota is a bunch of idiots for switching... yada yada. You just can't win I guess.