[Simh] PDP11 reset

[Alan Frisbie]

> 2. boot routines should jam PS = 340, which is what is expected today.
>
> #2 is based on an examination of the official boot ROM listings. While 
> there may be paths through the boot ROMs that don't set PS = 340, the 
> primary path does that, and it is known to work with all the existing 
> boot ROMs in the simulator.

My memory is far from perfect, but I recall a problem with
the DEQNA boot ROM (internal to the DEQNA, not external ROM)
in which it did not set PS=340.   As I recall, it loaded and
then executed code in low memory (the vector area).   If a
clock tick occured before the boot code finished, it would
dispatch to somewhere out in the weeds.

This was from a project I did in 1982, so my memory of the
details may be faulty.   As I recall, we were using an LSI-11/23.
If necessary, I can search for my notes on that project.

Alan Frisbie

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