ISO_1 is provided for compatibility with the Adaptive Server Enterprise default ISO_1 collation.
The differences with Adaptive Server Enterprise are:
ß, the lowercase letter sharp s (\xDF), sorts after lowercase s in Sybase IQ and SQL Anywhere, but after ss in Adaptive Server Enterprise.
The ligatures corresponding to Æ and æ (\xC6 and \xE6) sort after A and a respectively in Sybase IQ and SQL Anywhere (A, a, æ, Æ). In Adaptive Server Enterprise the sort order is A, a, Æ, æ.