> On Sep 7, 2018, at 12:37 PM, Mark Pizzolato <m...@infocomm.com> wrote:
>
> On Friday, September 7, 2018 at 1:18 AM, Lars Brinkhoff wrote:
>> Timothe Litt wrote:
>>> Adding an API in the CPU of the form assert_powerfail( vector) - where
>>> the default is the usual 24/26, but a ROM can specify an alternate
>>> (usually its base address + 24/26). This is common to all initiators.
>>
>> This touches on something else I have been thinking about.
>>
>> Would it be appropriate to have a SIGTERM (and/or similar signals) trigger a
>> power fail in the PDP-11 and other simulators with corresponding
>> mechanisms? SIGINT goes into the SCP console, and of course SIGKILL
>> instantly
>> switches off the simulated machine.
>> ...
>
> Alternatively, I've got a simulator that's been running via a script in a
> background process for 10+ years. The script it is running under receives
> one of these signals and that immediately drops out of sim_instr() and the
> script is configured to SAVE the simulator state to a file.
That's a fairly simple scripting exercise wrapped around SIMH. You can catch
the signal, send control/E to get the sim> prompt, then suitable examine and
deposit commands to simulate a trap to 24.
A Linux daemon control script could do the analogous, in response to system
startup and shutdown sequencing. I've done that with DtCyber, where the entire
system shutdown is scripted that way, a fairly complex process. In SIMH the
equivalent would typically be simpler, depending somewhat on the OS involved.
For example, running RSTS as a Linux daemon, started and shutdown via systemctl
or /etc/rc scripts would be easy enough.
paul
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