On 2/15/16 2:32 AM, Christian Corti wrote:
I've added another picture of a closeup of the R/W head. In my opinion
it's a 9 track read-after-write head. The geometry and gaps are
identical to those of the adjacent 7970B 800bpi-only tape drive we have.
I have two 7/9 track HP drives, and a bun
On Sun, 14 Feb 2016, Jay Jaeger wrote:
Looking at this manual for the 7970B / 7970E I see that dual 7/9 track
heads did exist.
Yes, but only in read-only configurations.
Yours has a plate that claims it has option 127 (as
well as 6, 7, 12 and 23). The 127 implies a 9 track only head, but I
On 02/14/2016 06:13 PM, Jay Jaeger wrote:
Maybe some yahoo decided to write over the first file of that SVR4 tape
at higher density so as not to clobber the files after it. Smart, so as
not to clobber the other stuff, but crazy. Or it may have been just a
case of writing that first file, with
On 02/14/2016 05:36 PM, Chuck Guzis wrote:
On 02/14/2016 02:08 PM, Jay Jaeger wrote:
I have never heard of 200bpi or 556bpi for anything other
than 7
track. I cannot imagine why anyone would ever produce
such a thing.
The only density I have ever heard of as being available
on both 7
track an
On 2/14/2016 5:36 PM, Chuck Guzis wrote:
> On 02/14/2016 02:08 PM, Jay Jaeger wrote:
>
>> I have never heard of 200bpi or 556bpi for anything other than 7
>> track. I cannot imagine why anyone would ever produce such a thing.
>> The only density I have ever heard of as being available on both 7
>>
On 02/14/2016 02:08 PM, Jay Jaeger wrote:
I have never heard of 200bpi or 556bpi for anything other than 7
track. I cannot imagine why anyone would ever produce such a thing.
The only density I have ever heard of as being available on both 7
track and 9 track is 800BPI NRZI, from any manufacture
On 2/13/2016 6:33 AM, Christian Corti wrote:
> On Thu, 11 Feb 2016, Christian Corti wrote:
>> I have a 7970B (-236) with options 127, 006, 007, 012 and 023.
>
> According to the HP 1000 Peripherals Selection Guide from 1982, page 16,
> option 236 specifies an 800bpi master magnetic tape subsystem
> So, apparently my NRZI 9 track drive has the density option included, and
I don't know if there were any other 200/556 bpi 9 track drives out there.
> When we got the drive I had hoped it would be a 7 track drive, but it
isn't.
Now I finally get it. NRZI, 200, 556 and 800 densities, but in 9 tra
On Thu, 11 Feb 2016, Christian Corti wrote:
I have a 7970B (-236) with options 127, 006, 007, 012 and 023.
According to the HP 1000 Peripherals Selection Guide from 1982, page 16,
option 236 specifies an 800bpi master magnetic tape subsystem with one
drive and two-card 13181B interface.
And
On Fri, 12 Feb 2016, Curious Marc wrote:
Can you confirm it can read and write 9 track formats in PE 1600 cpi?
Was there ever a 7970B with PE? I have the manual matching this unit
(serial number is marked on the cover page) and there's no mention of PE
AFAIK. It's the 1971 version of the 7970
Thanks for the details. Seems like the goldilocks unit, and of course one that
I can't find any documentation for. Can you confirm it can read and write 9
track formats in PE 1600 cpi?
Marc
> On Feb 11, 2016, at 2:28 AM, Christian Corti
> wrote:
>
> On Wed, 10 Feb 2016, CuriousMarc wrote:
>>>
On Wed, 10 Feb 2016, CuriousMarc wrote:
Note that Christian Corti stated that his drive is capable of 9-track
operation. That's an E.
It is not an E.
(Apparently that will also write 9-track PE at 1600bpi, but it will write
9-track NRZI at 800bpi).
I would know that ;-)
Interesting. So
On 2016-Feb-10, at 3:37 PM, Rich Alderson wrote:
> From: Curious Marc
> Sent: Wednesday, February 10, 2016 12:05 PM
>
> Top-posting,
>
>>> On Feb 10, 2016, at 11:40 AM, Rich Alderson
>>> wrote:
>
>>> From: Christian Corti
>>> Sent: Wednesday, February 10, 2016 2:28 AM
>
I actually *do* ha
>> Nice unit! Drool. Looks like this is a NRZI triple density tape, so
>> 7970A or B.
>> Marc
> Note that Christian Corti stated that his drive is capable of 9-track
operation. That's an E.
> (Apparently that will also write 9-track PE at 1600bpi, but it will write
9-track NRZI at 800bpi).
> R
From: Curious Marc
Sent: Wednesday, February 10, 2016 12:05 PM
Top-posting,
>> On Feb 10, 2016, at 11:40 AM, Rich Alderson
>> wrote:
>> From: Christian Corti
>> Sent: Wednesday, February 10, 2016 2:28 AM
>>> I actually *do* have a 9 track tape drive (HP 7970) that has 200/556/800
>>> bpi dens
Nice unit! Drool. Looks like this is a NRZI triple density tape, so 7970A or
B. The later 7970E would have a 1600 PE density switch too. I have an E, but
not with the multiple density or 7 track options unfortunately. Thanks for the
link to the series overview manual Rich.
Marc
Sent from my iP
From: Christian Corti
Sent: Wednesday, February 10, 2016 2:28 AM
> On Tue, 9 Feb 2016, Pete Lancashire wrote:
>> There are a few odd balls in 9-track as well, but the 556 was a typo.
> Really?
> I actually *do* have a 9 track tape drive (HP 7970) that has 200/556/800
> bpi densities:
> http:/
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