Using 19200 baud rate on DS 3100

[George Robbins]

In article <37801 at ut-emx.uucp> rick at ut-emx.uucp (Rick Watson) writes:
> Is is legal to select 19200 (EXTA) on the serial ports on a
> DECStation 3100?  It seemed to work for me for awhile, now I
> seem to get random speeds and the port hangs, requiring
> a reboot to clear it.  9600 works fine.

It's for sure that something doesn't like 19200 baud out there...

The man pages for pm(5) is somewhat obtuse.  It says that port #2, "can"
be a console port and the determination is made at power on.  It also
says the the console port must be set at 9600 baud.  It further says
that in multi-user mode if the console port is used, no other devices
can be attached.  Really confusing, eh?

Anybody want to take a whack at the following questions?

1) What actually control whether the port is used as a "console port"?
   If I leave a termina plugged in, or a modem does that become the
   console if the system crashes and reboots?

2) If the port is not being used as a "console port", then can one
   set the baud rate to one of the 16 arbitrary speeds?

3) Is 19200 baud, supposed to work, not supposed to work, broken somehow
   or locked out by the 9600 baud "requirement"?

4) If the port is being used as a "console port", does the really mean
   that I can't use port #3 as a local terminal/printer port?  Can I
   still use the keyboard/mouse on ports #0 and #1?

-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr at cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)