topic Re: Using Interrupt Priority Level C (IPC) in Operating System - OpenVMS

Using Interrupt Priority Level C (IPC)

Martin Vorlaender — Fri, 18 Nov 2005 03:43:51 GMT

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

Re: Using Interrupt Priority Level C (IPC)

Ian Miller. — Fri, 18 Nov 2005 04:38:54 GMT

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.

Re: Using Interrupt Priority Level C (IPC)

Jiri_5 — Sat, 19 Nov 2005 03:06:09 GMT

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>

Re: Using Interrupt Priority Level C (IPC)

Volker Halle — Sun, 20 Nov 2005 07:05:09 GMT

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.

Re: Using Interrupt Priority Level C (IPC)

Martin Vorlaender — Mon, 21 Nov 2005 02:42:06 GMT

Thanks, Ian, Jiri, and Volker.