ASE 12.5.x has a limit of 256 devices (including master)
The maximum device size is 32 GB.
So the maximum size for a user database is
(256 devices * 32GB/device) - (size of system databases)
i.e, just a little under 8 terabytes.
But, One database may have up to 2^31 (2,147,483,648) logical pages.
so its maximum size also depends on its logical page size:
on a 2K page server is 4TB
on a 4K page server is 8TB