[Soekris] multiport serial card recommendations for a net5501?

[Alfred Landrum]

If you have good or bad experiences with a multiport serial card,
please let me know.  I'd like to find an 8 port serial card to use
with a net5501 in order to create a linux-based serial access terminal
server.  I've found several vendors online, but not all specify
whether they will support 3.3v.

I saw the 1u soekris solution on the antenna-factory.com website uses
a sunix ser5066a, but my search attempts didn't locate anyone selling
that card in the US.

Thanks for any info - Al