[Simh] PDP11 on Simh for public access

[Johnny Billquist]

Bryan, I'm not understanding why the scripting capability in simh don't 
seem to do it for you...

   Johnny

On 2018-01-22 17:57, Bryan Davies wrote:
> Thank you Paul.
> 
> I now have V4 of Simh and V10.1 of RSTS so at least I'm up to date!
> 
> The date/time registers worked.   Unfortunately, the start process is 
> still getting stuck; now at the 'Start timesharing? <Yes>' prompt.   My 
> system doesn't have the 10 second timeout you describe here, although it 
> DOES have one on the later 'Proceed with system startup" prompt.
> 
> I have a vague memory (it's been 30 years!) of an auto restart flag in 
> the switch register & I'm wondering if you know about this.   Or maybe 
> the problem is elsewhere.
> 
> I'd be grateful for any more ideas you have on the subject.
> 
> Bryan
> 
> On 18 January 2018 at 16:05, Paul Koning <paulkoning at comcast.net 
> <mailto:paulkoning at comcast.net>> wrote:
> 
> 
> 
>     > On Jan 18, 2018, at 10:40 AM, Bryan Davies <bryan.e.davies at gmail.com <mailto:bryan.e.davies at gmail.com>> wrote:
>     >
>     > Many thanks to all for the advice.   Unfortunately I'm still not quite there.
> 
>     There is an easy solution if you have a recent RSTS.
> 
>     The OS keeps date and time in location 1000-1004.  That is preserved
>     across boot, and if on entry to INIT those locations contain what
>     seems like a valid date, that's used as the system date/time.  This
>     is why the more recent versions of RSTS don't prompt for date/time
>     if you do a restart (SHUTUP with restart) or use the BOOT command in
>     INIT.
> 
>     Second, if you're running V10.1, the "Start timesharing" prompt has
>     a 10 second timeout, and will default to "yes" (i.e., start RSTS) at
>     that point.
> 
>     So if you start SIMH with a startup script that deposits the date in
>     1000, and time in 1002, then issues the SIMH boot command, RSTS INIT
>     will pick up that date/time and after 10 seconds will go on to start
>     the OS.
> 
>     RSTS date format: (year-1970)*1000 + day_in_year
>     RSTS time format: 1440 - (minutes_since_midnight)
>     RSTS seconds: 60 - (seconds_since_minute)
> 
>     For example:
> 
>     $ pdp11 pdp11-42.ini
> 
>     PDP-11 simulator V4.0-0 Beta        git commit id: d3b6018d
>     sim> d -d 1000 32004
>     sim> d -d 1002 720
>     sim> d -d 1004 30
>     sim> bo rq
>     ?
>     Thu Jan 18 11:02:00 2018
> 
>     RSTS P10.1-L V101XM (DU0) INIT V10.1-0L
> 
>     04-Jan-02 12:00 PM
> 
> 
>     Start timesharing? <Yes> NO
> 
>     I entered the values in decimal (with -d) for convenience.  You can
>     see the correct date and time are picked up by INIT.  Seconds are
>     not displayed here but they are saved, so you can set them if you
>     want to be that precise.
> 
>              paul
> 
> 
> 
> 
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-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol