AUTO_INCREMENT Limit?

[Ben Kirkpatrick]

   I'm using mysql  Ver 9.15 Distrib 3.21.30, for sun-solaris2.6 (sparc)
which doesn't seem to support "OPTIMIZE TABLE".  I created 65k some-odd
records (ran out of keys), then deleted the lowest 200 records.  I ran 
"isamchk" and then tried doing more inserts, but I get this:
mysql> INSERT INTO testauto VALUES (0,'test');
ERROR 1062: Duplicate entry '65535' for key 1
   I must be missing something that gets this to re-use the unused keys.
Thanks,

Hiding in the light,
--Ben, http://www.pdx.net/~ben