Hi!
 I just picked up an IBM PowerStation 320H from the property disposition 
Yours should be u-channel like mine. So no alternative OS besides AIX.
I have had a 7012 type 320H sitting here for a few years now.
80Megs Ram, Scsi etc...
The serial port is a "modu-10" connector if I am not mistaken.
I had built an adapter MODU-10 to DB25 out of IDC connector and flat cable.
Lookup pinout on the net.
Was booting AIX 3.x or something when I got it.
I was never able to re-install a new AIX on this machine.
Only a few CDROM drives from Plextor and original IBM CDROM drives are
supposed to boot this machine.
Also maybe an IBm tape drive...
Even tried with an original IBM Cdrom, never worked...perhaps my AIX media
was wrong
I could boot the machine with the diag floppy disks but that does not help
to install a fresh AIX...
Claude
  warehouse of my friendly educational institution. It
seems to be in 
relatively
  good shape with all components present, but all I
could really afford was 
the
  system unit (which was only one dollar).
 Although the University seems to be pretty consistent with wiping the hard
 drives of all the machines that it disposes of, I'm still rather eager to 
try
  and power it up and see what the firmware's like,
and whether or not it is
 ACTUALLY wiped. Since I don't have a monitor/keyboard/mouse for it, 
though,
  my only option is to try to use a serial console.
 Unfortunately, these machines use a really wierd 10-pin serial port. I've
 tried searching around on the Internet for a pinout, but to no avail. Does
 anyone here have any idea how I can break this out to something more
 standard? I think I remember reading somewhere it was rather similar to 
the
  PC-RT serial ports...
 Thanks for any help!
 --Sean Caron (root(a)diablonet.net) | 
http://www.diablonet.net