Re: OPA0 Console connection

Let me summarize what I have undercovered so far.

firstly the COM1 port seems to be named TTA0 and the COM2 OPA0.
Why not just call them COM1 and COM2? If you need to use the other names,
make them an alias. Secondly, suggested remedy in the FAQ, in fact disables login
from that port, so that is not the right approach. So how to leave a console
cable attached without crashing the system is still not solved. BTW if I leave
it attached to a W2K problem does not occur.


On Mon, 13 Mar 2006 10:26:16 -0800, Tom Linden <tom@xxxxxxxxxx> wrote:

On Mon, 13 Mar 2006 17:42:41 GMT, Hoff Hoffman <hoff@xxxxxxxxx> wrote:

The OpenVMS Frequently Asked Questions (FAQ) section "How can I prevent
a serial terminal line from initiating a login?" might be of some
interest, here. And maybe "Using REPLY/LOG from DCL? Disabling Console
OPCOMs?", depending on what's initiating the chatter on the line.

Well I removed one end of the cable from the 7.3-1 and attached it to another
node running 7.3-2 and don't see this behaviour, from which I conclude that the
other node is "chattering" as you put it. In the FAQ your remedy is

In SYSTARTUP_VMS.COM, issue the command:

$ SET TERMINAL/NOTYPEAHEAD/PERMANENT ddcu:

Does imply a reboot is required? SHOW TERM DDCU: reveals no such device.
Can OPA0 be used instead of DDCU?

BTW, why is it on some nodes OPA0 and on others TTA0?

Oh, and a BREAK signal -- a serial line framing error -- or a [CTRL/P]
in the data stream, depending on the box -- can halt the configuration.
See "Why does my system halt when I power-cycle the console terminal?"
for related.

Yes this did indeed happen over night, and required a powerdown, as even SRM was
in an odd state, it didn't recognize any commands including init.

.

Relevant Pages

  • Re: OPA0 Console connection
    ... depending on what's initiating the chatter on the line. ... $ SET TERMINAL/NOTYPEAHEAD/PERMANENT ddcu: ... See "Why does my system halt when I power-cycle the console terminal?" ...
    (comp.os.vms)
  • Re: OPA0 Console connection
    ... ddcu is intended to be the device name for the terminal so ddcu: ... The console appears on AlphaServers with the console set to serial as ...
    (comp.os.vms)