[pjmlp]

I wrote a connector for Sybase back in 2000, based on our existing one for MS SQL Server 7, and some things had already changed on the protocol level.

I don't remember exactly what and why, just that for some specific DML commands another kind of connection was required.

[CaptainZapp]

The split must have happened in the mid nineties (I think) with SQL Server 6 and Sybase 10. The next version after 4.9.

It's notable that 10 was the worst Sybase version, ever.

Source: I worked for Sybase Professional Services from 95 - 99.