[Simh] PDP11 on Simh for public access

[Bryan Davies]

Thanks Paul,

unfortunately I'm running RSTS V7 and tbh I'd like to keep it that way
because I want to show the old style CLI rather than DCL.   I did try
depositing the date and time values as suggested and just on the off chance
but it didn't work.

Rgds

Bryan


On 18 January 2018 at 16:05, Paul Koning <paulkoning at comcast.net> wrote:

>
>
> > On Jan 18, 2018, at 10:40 AM, Bryan Davies <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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.trailing-edge.com/pipermail/simh/attachments/20180118/86a134b1/attachment.html>