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SIMH + OpenVMS 5.5-2H4 standalone BACKUP: ISO appears as DJAx not DUAx

From flexmcmurphy <plica2006@gmail.com>
Newsgroups comp.os.vms
Subject SIMH + OpenVMS 5.5-2H4 standalone BACKUP: ISO appears as DJAx not DUAx
Date 2025-12-17 23:00 +0000
Organization A noiseless patient Spider
Message-ID <6a5b951af8d8265f473fd5d8644440c9c3b658f4.camel@gmail.com> (permalink)
References <10h055c$217jf$1@dont-email.me> <10h3upk$3f20l$1@dont-email.me> <10hrovq$mbo$1@reader2.panix.com> <10ht0rk$34qt0$2@dont-email.me> <10huned$jc8$2@reader2.panix.com>

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Hello,
  
I am installing OpenVMS VAX 5.5-2H4 under SIMH 4.0 on a Raspberry Pi 3B+ running Raspi OS "Trixie".
I am confused by how standalone BACKUP assigns device names when booted from installation media.  
  
This is where I got the ISO from (Server 1)    
[[https://winworldpc.com/download/b0d47071-ccb7-11e7-a73f-fa163e9022f0](https://winworldpc.com/download/b0d47071-ccb7-11e7-a73f-fa163e9022f0)](https://winworldpc.com/download/b0d47071-ccb7-11e7-a73f-fa163e9022f0](https://winworldpc.com/download/b0d47071-ccb7-11e7-a73f-fa163e9022f0))  
  
Setup (simplified):    
- SIMH VAX (have tried MicroVAX 3900 and VAX 8600)    
- OpenVMS VAX 5.5-2H4 ISO attached as an RQ device (read-only)    
- Booting directly from the ISO into standalone BACKUP  
  
In standalone BACKUP, the installation media always appears as DJAx    
(device type RA60), not as DUAx, for example:  
  
Available device DJA3: device type RA60  
  
As a result, restoring the saveset only works using:  
  
BACKUP DJA3:VMS2H4055.B/SAVE_SET DUA0:  
  
However, I have seen multiple reports (e.g. WinWorldPC forum, blog tutorials)    
where users claim to restore from the *same* OpenVMS 5.5-2H4 ISO using:  
  
BACKUP DUAx:VMS2H4055.B/SAVE_SET DUA0:  
  
Example tutorials where ISO image can be access as a logical device (DUAx) rather than as a physical device (DJAx):    
[[https://forum.winworldpc.com/discussion/11935/vms-5-x](https://forum.winworldpc.com/discussion/11935/vms-5-x)](https://forum.winworldpc.com/discussion/11935/vms-5-x](https://forum.winworldpc.com/discussion/11935/vms-5-x))    
[[https://hb1bbs.com/VAX/VMS-on-a-Raspberry-Pi/](https://hb1bbs.com/VAX/VMS-on-a-Raspberry-Pi/)](https://hb1bbs.com/VAX/VMS-on-a-Raspberry-Pi/](https://hb1bbs.com/VAX/VMS-on-a-Raspberry-Pi/))    
[[https://www.openvmshobby.com/vax-vms/openvms-on-vax-simh/](https://www.openvmshobby.com/vax-vms/openvms-on-vax-simh/)](https://www.openvmshobby.com/vax-vms/openvms-on-vax-simh/](https://www.openvmshobby.com/vax-vms/openvms-on-vax-simh/))    
[[https://www.wherry.com/gadgets/retrocomputing/vax-simh.html](https://www.wherry.com/gadgets/retrocomputing/vax-simh.html)](https://www.wherry.com/gadgets/retrocomputing/vax-simh.html](https://www.wherry.com/gadgets/retrocomputing/vax-simh.html))  
  
My questions are:  
  
1) Under standalone BACKUP 5.5-2H4, what determines whether the boot    
device is assigned DUAx vs DJAx?    
2) Is this affected by the VAX model (MicroVAX vs 8600/8650), SIMH MSCP    
configuration, or whether BACKUP was booted from that device?    
3) Is DJAx actually the expected and correct name for RA60-based ISO    
media in this environment?    
4) Using my setup is it at all possible for me to restore the save_set with a command such as:    
$ backup dua3:VMS2H4055.b/save_set dua0:    
instead of    
$ backup dja3:VMS2H4055.b/save_set dua0:  
  
Any clarification would be greatly appreciated.  
  
Thank you,    
Sean

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  Re: DCL2 Marc Van Dyck <marc.gr.vandyck@invalid.skynet.be> - 2025-12-06 11:42 +0100
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      Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-06 10:57 -0500
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              Re: DCL2 kludge@panix.com (Scott Dorsey) - 2025-12-07 10:03 -0500
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      Re: DCL2 antispam@fricas.org (Waldek Hebisch) - 2025-12-15 01:51 +0000
        Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-15 02:56 +0000
        Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-15 16:37 +0000
          Re: DCL2 jgd@cix.co.uk (John Dallman) - 2025-12-15 19:37 +0000
            Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-15 22:59 +0000
      Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-15 11:58 -0500
  Re: DCL2 "Craig A. Berry" <craigberry@nospam.mac.com> - 2025-12-06 15:28 -0600
    Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-06 18:46 -0500
      Re: DCL2 "Craig A. Berry" <craigberry@nospam.mac.com> - 2025-12-07 07:17 -0600
        Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-07 11:07 -0500
          Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-07 11:13 -0500
            Re: DCL2 steve sparrow <sdsparrow@aol.com> - 2025-12-08 11:14 -0600
              Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-08 19:07 -0500
        Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-16 14:05 +0000
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            Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-16 21:59 +0000
            Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-16 20:17 -0500
              Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-16 20:42 -0500
              Re: DCL2 "Craig A. Berry" <craigberry@nospam.mac.com> - 2025-12-17 07:19 -0600
                Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-18 09:46 -0500
              Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-18 09:44 -0500
            Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-17 16:55 +0000
          Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-16 20:26 -0500
            Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-17 16:57 +0000
              SIMH + OpenVMS 5.5-2H4 standalone BACKUP: ISO appears as DJAx not DUAx flexmcmurphy <plica2006@gmail.com> - 2025-12-17 23:00 +0000
              Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-17 20:45 -0500
                Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-18 15:03 +0000
      Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-14 01:41 +0000
        Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-15 11:59 -0500
          Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-15 23:01 +0000
            Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-15 19:28 -0500
              Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-16 01:24 +0000
                Re: DCL2 Sam Thomas <sam@noneya.com> - 2025-12-16 17:38 +0000
                Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-16 22:07 +0000
                Re: DCL2 Sam Thomas <sam@noneya.com> - 2025-12-17 14:52 +0000
                Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-17 20:34 -0500
                Re: DCL2 Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-18 02:31 +0000
                Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-17 21:40 -0500
  Re: DCL2 Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-08 14:12 +0000
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    Re: DCL2 bill <bill.gunshannon@gmail.com> - 2025-12-08 15:42 -0500
      Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-10 20:50 +0000
        Re: DCL2 Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-11 13:11 +0000
          Re: DCL2 cross@spitfire.i.gajendra.net (Dan Cross) - 2025-12-11 16:22 +0000
    Re: DCL2 Arne Vajhøj <arne@vajhoej.dk> - 2025-12-08 19:58 -0500
      Re: DCL2 Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-09 13:31 +0000
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      Re: DCL2 Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-09 13:55 +0000
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          Re: DCL2 Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2025-12-10 14:14 +0000
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