gwr@linus.mitre.org (Gordon W. Ross) (10/26/90)
In article <2652@dsacg3.dsac.dla.mil> of comp.unix.sysv386, ntm1569@dsacg3.dsac.dla.mil (Jeff Roth) asks: > [...] "is there any way to force a system coredump if a machine is hung?" Yes. If you have an NMI (Non-Maskable Interrupt) switch on your machine, pressing it will cause a panic and system dump. If you don't have such a switch it is trivial to add one. You need a switch between the NMI line and ground. The NMI line is available on every I/O channel slot, pin 2 (that's from memory -- look it up!) As always, don't blame me if you fry your mother board... -- Gordon W. Ross (M/S E095) internet: gwr@linus.mitre.org The MITRE Corporation uucp: {decvax|philabs}!linus!gwr Burlington Road office phone: 617-271-3205 Bedford, MA 01730 (U.S.A.)
rob@phavl.UUCP (Robert Ransbottom) (10/28/90)
In article <124442@linus.mitre.org> gwr@linus.mitre.org (Gordon W. Ross) writes: >In article <2652@dsacg3.dsac.dla.mil> of comp.unix.sysv386, >ntm1569@dsacg3.dsac.dla.mil (Jeff Roth) asks: > >> [...] "is there any way to force a system coredump if a machine is hung?" > >Yes. If you have an NMI (Non-Maskable Interrupt) switch on your >machine, pressing it will cause a panic and system dump. > On ISC 386ix V.3.2 (2.0.2) with Operating System Messages and Kernel Debugging built in, system phavl traps NMI's, hovers for a couple of secs, issues diagostics, and continues. (I thought there was a bad tape drive, but seems cpio with -C714400 has been grabbing flaky ram.)