[Simh] EXT :Re: MicroVAX II time across boots

[Wilm Boerhout]

Yes, I know about the need to SET TIME periodically. But "too far off" 
certainly cannot be a few days. If I switch a MicroVAX II off for a 
couple of days, and the battery is good, it will surely pick up the time?

If I switch my simh MicroVAX off for a couple of hours, VMS will ask for 
the time. I have no more precise measurement than "a couple of hours" BTW.

/Wilm

Hittner, David T (IS) schreef op 11-4-2016 om 15:42:
>
> VMS checks the base time stamp time written in OS files vs. the clock 
> during boot. If the time is too far off, you will be prompted to enter 
> the system time.
>
> Once a year or so, you have to issue a “$ SET TIME” command in VMS 
> with no parameters to cause VMS to rewrite the base time stamp in the 
> OS file.
>
> The next reboot should not prompt for system time.
>
> Dave
>
> *From:*Simh [mailto:simh-bounces at trailing-edge.com] *On Behalf Of 
> *Wilm Boerhout
> *Sent:* Monday, April 11, 2016 9:23 AM
> *To:* Anders Magnusson; SIMH Mailing List
> *Subject:* EXT :Re: [Simh] MicroVAX II time across boots
>
> From simh VAX/vax630_defs.h:
>
> #define NVRBASE         0x200B8000                      /* NVR base */
>
> so that appears to be implemented in the simh "nvr" device. My ini 
> file attaches that device to a file, so I would expect that this file 
> acts as a battery-operated nvr chip. Still, after closing simh, and 
> restarting, VMS still asks for the time. Not so on a reboot of VMS 
> within the simh instance.
>
> Time to file a bug?
>
> /Wilm
>
> Anders Magnusson schreef op 11-4-2016 om 15:13:
>
>     It has a clock chip at 0x200b8000 from where it reads current
>     time, similar to a PC.
>     The console mailbox is also in that chip.
>
>     -- R
>
>     Den 2016-04-11 kl. 14:33, skrev Wilm Boerhout:
>
>     How does a real MicroVAX II preserve its time across boots?
>
>     How is this implemented in simh MicroVAX II? i.e. what virtual
>     device should I attach to a file so that the time is preserved in
>     VMS?
>     My configuration (below) does not preserve the time (VMS V7.3
>     fully patched)
>
>     Thanks,
>     /Wilm
>
>     --- simh config ---
>     ; unused devices:
>     set cr disable
>     set lpt disable
>     set rl disable
>     set tq disable
>     set ts disable
>
>     att nvr /opt/simh-master/BIN/nvram.bin
>
>     set cpu 16M conhalt idle=VMS
>     set rom nodelay
>     set qba autoconfig
>
>     ; DZ11
>     set dz enable
>     set dz lines=4
>     att dz 10000
>
>     ; DUA controller
>     set rq0 autosize
>     att -e rq0 /vdisk/PAGESWAP.vdisk
>     set rq1 disable
>     set rq2 disable
>     set rq3 disable
>
>     ; Ethernet
>     set xq mac=08:00:2B:17:08:58
>     att xq tap:tap0
>
>     boot cpu
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