[Info-vax] DZQ11 on VAX/4000 Model 300

[Stephen Hoffman]

On 2019-01-14 17:04:41 +0000, David Wade said:

>   I have just installed a DZQ11 in my VAX/4000 and once I figured out I 
> had by "A" and "B" pins mixed up on the BERG connector  (I had to 
> fabricate a lead as it came without any) on a brief test it seems to be 
> working just fine.
> 
> However when I removed it the VAX seemed to hang on boot. I popped it 
> back in and it seems to be working fine.

> So should I do anything to VMS to manage its configuration?

Nope.  OpenVMS is working exactly as expected.

> In case it matters the machine is running VMS 7.3. The other cards in 
> the machine are, from the CPU and memory moving left, a TK70 controller 
> card, a KZQSA SCSI controller with CD ROM and the DZQ11.
> 
> Please excuse me asking on here but google seems to be intent on 
> referring me to hpe sites which all redirect to the documentation Index.

HPE is exiting the OpenVMS business.

Use Google Groups search of the comp.os.vms newsgroup archives, search 
for the word "serpentine" (though that's less of an issue with BA213 
and BA215 and BA4xx series Q-bus boxes), and learn how the Q-bus and 
the Q-bus boards are configured.

Basically, the Q-bus CSRs and vectors can vary by what's installed in 
the Q-bus in the box, and you'll need to adjust the CSR and (if 
present) vector settings on one or more other Q-bus modules in the bus, 
and/or insert a bus grant card or otherwise fill the vacated slot.

Start by reading chapters 3 and 4 here:
https://archive.org/stream/bitsavers_decvax630AITechnicalManualBA23EnclosureOct85_15635013/AZ-GLFAB-MN_VAXstation_II_Technical_Manual_BA23_Enclosure_Oct85#mode/2up 


Oh, and ********NEVER********** believe the interrupt vector setting 
shown by OpenVMS.   Be skeptical about the CSR setting, too.
OpenVMS VAX will tell you what it thinks or expects the vector to be, 
and that may not match reality.
OpenVMS VAX has no direct means of reading the interrupt vector 
setting, and the indirect means is dicy at best and is not implemented 
by OpenVMS displays.
Again, ********NEVER, EVER, EVER, UNDER NO CIRCUMSTANCES, DO NOT EVEN 
THINK OF IT, NOT-AT-ALL, NOPE, DO NOT MAKE THIS MISTAKE******** trust 
what OpenVMS VAX shows for CSR and particularly vector settings.
Remove the boards, and decode the CSR and (if present) the interrupt 
vector setting.

And FWIW, Google seemingly doesn't include the Google Groups content in 
most Google searches.  Only the Google Groups search seemingly includes 
that data from here in the newsgroup, and that Google Groups search 
doesn't always work reliably.



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