Using Interrupt Priority Level C (IPC)

[Martin Vorlaender]

Just stumbled over http://h71000.www7.hp.com/doc/82FINAL/aa-pv5mj-tk/00/00/95-con.html

1. On which VAXen does Ctrl-P get you a console prompt?

2. Does one really get an SRM(-like?) ">>>" prompt if you press Ctrl-P on an Itanium system? Put another way: After which sequence of keys/commands can one enter the commands to adjust the quorum / cancel a mount verification / enter XDELTA on Itanium?

Just curious...

Martin

[Ian Miller. · Accepted solution]

One of the new things in VMS V8.2-1 is the processing of control-P on the console changed to be more like what is seen on alpha.
You do get >>> prompt (which times out) and use Q for quorum etc as normal.

[Jiri_5]

After Ctrl-P on Itanium:

$

Interrupt Priority C

Commands:
C device Cancel Mount Verification
Q Adjust Quorum
CTRL-P Prompt for Crash
CTRL-Z Exit IPC

IPC>

[Volker Halle]

Martin,

up to and including OpenVMS I64 V8.2, you could not trigger an IPC interrupt, typing CTRL-P on the console just allowed you to force a system crash:

Crash (y/n): y

**** OpenVMS I64 Operating System X9ZG-J2S - BUGCHECK ****
...

You'll never get a >>> prompt on I64 systems, EXCEPT after shutting down without a reboot (maybe a reminiscence to Alpha SRM ?):

**** Primary HALTED with code HWRPB_HALT$K_REMAIN_HALTED

**** Hit any key to cold reboot ****

P00>>>


To get a console prompt '>>>' on VAX systems either needs:

- press HALT button
- send a BREAK signal on console line
- type CTRL_P on console terminal

This differs depending on the system type. Some systems can also disable CTRL_P or BREAK processing, others can't.

Volker.

[Martin Vorlaender]

Thanks, Ian, Jiri, and Volker.