Probs w. M3119 CXY08 MUX on VAX VMS 7.3

Johnny Billquist bqt at
Mon Aug 17 19:08:43 CDT 2015

Guys. Slow down. It is not a cable error. It is not a terminal error. If the system also had the card already installed before it is also not an installation error. It is also probably not an interrupt error.
I can go into more details behind the reasoning for this if people are interested.

Holm did mention that the card had been configured as a dhv11. That would suggest that the card has been out, which is why I also wondered about installation. Point is, the backplane here is one with only q-cd slots. Some cards have jumpers that should be set different for q-q or q-cd slots.

The dhv11 uses dma for output. No interrupt until all data has been transmitted. Vms shows device errors, and not a single char comes out. The error log can contain much more detail. Someone already provided the command to see the error log. Post what that shows. It might be informative. Broken clock is definitely a possibility.


Holm Tiffe <holm at> skrev: (17 augusti 2015 23:13:21 CEST)
>Jay Jaeger wrote:
>> On 8/17/2015 1:18 PM, Holm Tiffe wrote:
>> > Johnny Billquist wrote:
>> > 
>> > [..]
>> >>>
>> >>> Since I'm a total VMS Noob I now have some Questions:
>> >>>
>> >>> .. have I missed something?
>> >>> .. is the CXY08 bad?
>> >>> .. what could I try next?
>> >>> there some diagnosting software for the CXY08 existing for
>> >>>    and if yes, where can I get it?
>> >>>
>> >>> Thanks in advance,
>> >>
>> >> Since you have an error count in there, I would expect there to be
>> >> something in the error log. Might be worth checking what it
>> > 
>> > I think that errors are exactly what I got on the console, the
>write error,
>> > (timeout writing) but ok, I could check that.. where exactly I
>should look?
>> > 
>> Timeout: Is it perhaps expecting an interrupt but doesn't get one in
>> reasonable amount of time?   Maybe something wrong in the interrupt
>> grant chain?   Do you have an empty slot above this board into which
>> need to insert a grant continuity card?
>> JRJ
>Hey Guys...please read what I'already wrote to this problem.
>Therie is no hole between the CPU and the MUX.
>And yes, it feels like DMA or Interrupt Timeout, that's why I think
>the clock crystal may be broken..

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