On 06/19/2012 11:13 AM, Paul_Koning at Dell.com wrote:
That said, the DELQA has a "DEQNA compatibility mode"...whether that
makes it as slow and/or buggy as the DEQNA, I don't know.
I don't think so.
QNA compatibility mode means it works like a QNA from the driver point of view. That was never the issue with the QNA -- if it had worked according to the specification, it would have been quite a good device. The problem was that it never worked correctly, not even after 12 revisions. Finally when rev L didn't work adequately either, the DEC software teams said enough is enough, we're dumping the QNA.
The issues were most obvious on VMS; I'm not sure if they were visible enough on the PDP11 OSs to cause concern. Maybe with LAT, probably not or less so with DECnet. I don't remember the details, other than that Local Area VAXclusters were the ones that tended to run into trouble, since those protocols were particularly unforgiving.
I remember hearing from 25 years ago the bugs in the DEQNA, but never
knew what they were/are. I wonder if that information is archived
anywhere. In some Micronotes somewhere maybe?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
On Jun 19, 2012, at 10:52 AM, Dave McGuire wrote:
On 06/19/2012 10:27 AM, Johnny Billquist wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken
DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
No. From a reliability point of view, I've not heard that either should
be better or worse. However, the DEQNA is rather buggy in its general
performance.
Side-by-side, the DELQA is quite a bit faster than the DEQNA, the
DELQA-YA ("Turbo DELQA") even more so.
That said, the DELQA has a "DEQNA compatibility mode"...whether that
makes it as slow and/or buggy as the DEQNA, I don't know.
I don't think so.
QNA compatibility mode means it works like a QNA from the driver point of view. That was never the issue with the QNA -- if it had worked according to the specification, it would have been quite a good device. The problem was that it never worked correctly, not even after 12 revisions. Finally when rev L didn't work adequately either, the DEC software teams said enough is enough, we're dumping the QNA.
The issues were most obvious on VMS; I'm not sure if they were visible enough on the PDP11 OSs to cause concern. Maybe with LAT, probably not or less so with DECnet. I don't remember the details, other than that Local Area VAXclusters were the ones that tended to run into trouble, since those protocols were particularly unforgiving.
paul
On 06/19/2012 10:03 AM, Saku Set l wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken DELQA
(sorry for chiming in late)
I have quite a few of both here; if you have a hard time getting one
to Johnny, let me know and I'll send one over. Shipping from USA will
take awhile though.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
On 06/19/2012 10:52 AM, Dave McGuire wrote:
On 06/19/2012 10:27 AM, Johnny Billquist wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken
DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
No. From a reliability point of view, I've not heard that either should
be better or worse. However, the DEQNA is rather buggy in its general
performance.
Side-by-side, the DELQA is quite a bit faster than the DEQNA, the
DELQA-YA ("Turbo DELQA") even more so.
^^^^ This was supposed to be "YM", not "YA"
That said, the DELQA has a "DEQNA compatibility mode"...whether that
makes it as slow and/or buggy as the DEQNA, I don't know.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
On 06/19/2012 10:27 AM, Johnny Billquist wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken
DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
No. From a reliability point of view, I've not heard that either should
be better or worse. However, the DEQNA is rather buggy in its general
performance.
Side-by-side, the DELQA is quite a bit faster than the DEQNA, the
DELQA-YA ("Turbo DELQA") even more so.
That said, the DELQA has a "DEQNA compatibility mode"...whether that
makes it as slow and/or buggy as the DEQNA, I don't know.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
On Jun 19, 2012, at 17:27, Johnny Billquist wrote:
On 2012-06-19 16:16, Pontus Pihlgren wrote:
On Tue, Jun 19, 2012 at 05:03:13PM +0300, Saku Set l wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
No. From a reliability point of view, I've not heard that either should be better or worse. However, the DEQNA is rather buggy in its general performance.
Johnny
When used with VAX hardware DEQNA is unsupported as of VMS 5.5 or thereabouts.
For me it does not work with 5.5-2, but it does work with VMS 5.4
Mihai
On 2012-06-19 16:16, Pontus Pihlgren wrote:
On Tue, Jun 19, 2012 at 05:03:13PM +0300, Saku Set l wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
No. From a reliability point of view, I've not heard that either should be better or worse. However, the DEQNA is rather buggy in its general performance.
Johnny
On Tue, Jun 19, 2012 at 05:03:13PM +0300, Saku Set l wrote:
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken DELQA
I recall that the DELQA is more "modern" and better i some way, are they
also more prone to failure?
Regards,
Pontus.
Found 1 DELQA and 4 DEQNA (condition unknown), and also have 1 broken DELQA
--Saku
On Tue, Jun 19, 2012 at 3:34 PM, Pontus Pihlgren <pontus at update.uu.se> wrote:
On Tue, Jun 19, 2012 at 01:35:29PM +0200, Johnny Billquist wrote:
> So, does anyone have a spare DELQA just laying around, that they
> could donate? (I could send one back eventually, when I get to my
> parts in Sweden, but that might take quite a while.)
I have some _untested_ DELQA _somewhere_ (remember that I just moved).
Let me know if it doesn't sort itself and I'll go dig.
/P
On Tue, Jun 19, 2012 at 01:35:29PM +0200, Johnny Billquist wrote:
So, does anyone have a spare DELQA just laying around, that they
could donate? (I could send one back eventually, when I get to my
parts in Sweden, but that might take quite a while.)
I have some _untested_ DELQA _somewhere_ (remember that I just moved).
Let me know if it doesn't sort itself and I'll go dig.
/P
