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-boun...@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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