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 _______________________________________________ Simh mailing list Simh@trailing-edge.com<mailto:Simh@trailing-edge.com> http://mailman.trailing-edge.com/mailman/listinfo/simh
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