Hayes compatible modems on 3620s with 8.0 from the console serial port

[pan@ATHENA.PANGARO.dialnet.symbolics.com (Paul Pangaro)]

Has anyone hooked up a configuration with Hayes compatible modems on
3620s with 8.0 from the console port? We have a 3620 that worked fine
with the Mailer with the same modem and serial port under 7.2 a few
months ago, but cant get it to work now. (We've blown off the 7 worlds
and cant try it that way conveniently). The modem is still fine (works
on other machines), and other consoles have been tried with no luch; I
think the only thing we havent tried is swapping boards in the 3620,
which is very troublesome (no spares handy). I wondered if anyone has
made this configuration work, which would mean that I have to try what
is troublesome to see if the i/o hardware has gone bad just recently.
All advice welcome, thanks.  (Come to think of it, the tape drive
started acting up at the same time, but that symptom is that is does not
always "see" the tape drive, does not select (no light or head reset),
but then you flip the lever to hold the tape in, it finds it again, but
only for a single read ---- this sounds unrelated, no?)