Connecting AIX PS/2 to Modems

[Kevin P. Kleinfelter]

hhs at penguin.hut.fi (Hannu Strang) writes:

>I have problems using AIX PS/2 with modems and would like to know what are
>the correct settings in devices program and /etc/ports for a modem line.
>If AIX wants some modem signals permanently on, a list of those would also
>be helpful. AIX manuals don't say much about this.
...
>I would also like the modem lines to be bi-directional. 
...
This is indeed poorly documented (IMHO).  Via "devices" try the following:

tt=vt100
ae=true
dvam=remote
bpc=8
nosb=1
pt=none
elevel=1,4
rts=2400
ixp=false
aa=false
pro=dc

Now these are the values I use with my current software. Before I applied
a recent upgrade, it seems that setting PRO=DC caused SERIOUS problems.
IBM's support line was unable to give a technical explanation, and simply
said "Only  use PRO=DC for Direct Connections."  The critical parameters
seem to be DVAM and PRO.  I have found that changing settings of these
flags SOMETIMES seems to require a reboot to take effect.  My problems
were greatly reduced after I applied the UPDATE disks from August 1989.
If you do not have these, I suggest that you get them from IBM.  Also,
the devices command's menus on my machine have been modified by a
Dickens Data (multiport) serial driver, which seems to help quite a bit.
When I originally setup my machine (before Dickens and before updates),
I found that reading the "asy" section in the tech ref, running
"devices", and MANUALLY MODIFYING the major/minor node numbers, and
/etc/ports was required to get things to work.  I spent about a week.
I think a minor node of "64" seemed to work best.  Lotsa luck.