From my post http://itknowledgeexchange.techtarget.com/dba/sybase-15-upgrade-project/ about my company migrating one instance to ASE 15 I had the following Question as a comment.
hey i need to know about the driver and provider required for Sybase 15.
Have to migrate from sybase12.5.3 to sybase 15.
and what are the corressponding compatibility issues?
The answer to this is that I am still using the Sybase 12.5.x drivers on my machine and have not noticed any issues connecting or while performing any task up to this point. I also suggest, if you want, to install the new drivers that should be included on the client install media. This is where you would go to install Sybase Central and any other client tools. I recommend installing Sybase Central as it can be a good tool to quickly look at a database, its devices, and other properties very quickly.
Thanks for the question and I hope that this helps.