Mario,
Google and the IBM FTP site both have info.
Here's the last release of the Tru64 client:
ftp://ftp.software.ibm.com/storage/tivoli-storage-management/maintenance/client/v5r1/Tru64UNIX/v517

This client is no longer under development.

From what I understand, you'll still get howto/usage support on it as long

as you're using a supproted level of TSM Server; however, if defects or
compatability problems arise, no further fixes would be provided.

-Josh

On 06.04.05 at 07:26 mariobehring AT YAHOO DOT COM wrote:

Date: Wed, 5 Apr 2006 07:26:27 -0700
From: Mario Behring <mariobehring AT YAHOO DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Tru64 BAC

Hi list,

Does TSM 5.3.X support any agent for a Tru64 OS running on a Digital machine ? 
I did not found any information about it in the readmes....

Thanks.

Mario