The STSDAS TABLES package, which supports the TABLES format used by the STSDAS and PROS packages and IRAF.NOAO.DIGIPHOT, is distributed by the Space Telescope Science Institute. It is available separately from STSDAS as of v1.3. This is an layered package on the distributed IRAF system so you must have a running IRAF system before you can install TABLES.
TABLES is available from ftp://ftp.stsci.edu/software/stsdas/. Questions should be directed to help@stsci.edu. Binaries of the latest version for most architectures are available in the contrib directory.