> On Dec 4, 2019, at 6:15 PM, Kevin Handy <khandy2...@gmail.com> wrote:
>
> What it sounds like you need, is for simh to detect the shutdown interrupt
> itself, and then save the current state of everything in the machine to a
> file. Upon power-up, it then needs to restore back to that state.
> You;d have to save the current configuration settings, state of memory, cpu
> registers, device structures, etc., and then be able to read it all back in
> and restore everything back to a working state. Could get complicated, for
> example the disk drive have a timer in them so that they don't respond
> instantly to read requests, so this type of thing would need to be saved.
> Is it possible to manually do this right now? Store the state of a machine,
> them restore it back using simh commands to individually reset all the
> devices?
On a PDP11, this could be handled via a power fail interrupt, assuming the OS
you have supports power fail and recovery. RSTS-11, with core memory (so you'd
want to persist the memory across restarts) does. I'm not sure if others do.
(RSTS/E does not.)
paul
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