-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck
Guzis
Sent: 10 June 2015 06:07
To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off-
Topic Posts
Subject: Re: 80 column (un)punched cards
On 06/09/2015 08:52 PM, Mike Stein
What is best place to buy new 1/2 tape ? (recent datecodes)
thanks for advice
Ed# _www.smecc.org_ (http://www.smecc.org)
I was looking at a couple of documents describing the Pertec tape interface;
the manual for my Kennedy 9610 tape drive, and a nice reference by a fellow
with a rather familiar name:
http://www.sydex.com/pertec.html
According to my Kennedy manual, issuing a read command causes the drive to
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
Sent: 10 June 2015 05:46
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Front Panel Update
Interesting. Varian is a microwave equipment company; I have one of
their
Mark,
Traditional 9-track tapes are always written block-by block with a short
gap between the records, WikiPedia say 0.6 for 1600BPI which sounds about
right. From what I remember as tapes are not the most reliable medium the
process was to have the read head after the write head so the tape
They breathe better if you do not have them sealed when you are baking
them..ed _www.smecc.org_ (http://www.smecc.org)
(resent due to error message)
Original message
From: Chuck Guzis ccl...@sydex.com
Date: 06/09/2015 9:46 PM (GMT-07:00)
To:
I finally succeeded in putting a name to where I've seen that clingy
vinyl material before--in a children's toy:
Google: Colorforms
--Chuck
On Jun 9, 2015, at 22:57 , Chuck Guzis ccl...@sydex.com wrote:
The 3M ones that I've seen are hard white plastic (not PVC or whatever Wright
Line used) with a keyhole-sort of affair that allows the circle to expand.
Interesting. I don't think I've encountered that style before, or if I
On Tue, 9 Jun 2015 14:27:57 -0400
Michael Thompson michael.99.thomp...@gmail.com wrote:
Date: Mon, 08 Jun 2015 12:26:07 -0700
From: couryhouse couryho...@aol.com
Subject: Re: Front Panel Update
8s is rare?? ? We have one. ?Is there a an registry? ?
Ed# ?smecc.org
Ben.
I
On 6/9/2015 12:27 PM, Michael Thompson wrote:
Date: Mon, 08 Jun 2015 12:26:07 -0700
From: couryhouse couryho...@aol.com
Subject: Re: Front Panel Update
8s is rare?? ? We have one. ?Is there a an registry? ? Ed# ?smecc.org
Ben.
I know of 17 PDP-8/S systems, including four at the RICM.
The
I made a list from scanning classiccmp and Usenet groups.
Sent from my iPhone
On Jun 9, 2015, at 2:56 PM, Lyle Bickley lbick...@bickleywest.com wrote:
On Tue, 9 Jun 2015 14:27:57 -0400
Michael Thompson michael.99.thomp...@gmail.com wrote:
Date: Mon, 08 Jun 2015 12:26:07 -0700
From:
Date: Mon, 08 Jun 2015 12:26:07 -0700
From: couryhouse couryho...@aol.com
Subject: Re: Front Panel Update
8s is rare?? ? We have one. ?Is there a an registry? ? Ed# ?smecc.org
Ben.
I know of 17 PDP-8/S systems, including four at the RICM.
The RICM has an OMD8S data-break and memory
17 is still pretty scarce!
In a message dated 6/9/2015 11:57:04 A.M. US Mountain Standard Time,
lbick...@bickleywest.com writes:
I know of 17 PDP-8/S systems, including four at the RICM.
The RICM has an OMD8S data-break and memory expansion chassis for an
8/S.
From: Michael Thompson
Sent: Tuesday, June 09, 2015 12:05 PM
On Jun 9, 2015, at 2:56 PM, Lyle Bickley lbick...@bickleywest.com wrote:
On Tue, 9 Jun 2015 14:27:57 -0400
Michael Thompson michael.99.thomp...@gmail.com wrote:
I know of 17 PDP-8/S systems, including four at the RICM.
The RICM
On 6/10/15 8:40 AM, Dennis Boone wrote:
Using dd to read tapes to disk discards the block size information.
And that is precisely why I'm thinking of an ad-hoc interface rather
than just plugging a SCSI drive into a UNIX box.
It's eminently possible to image tapes sanely on a unix
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mark J.
Blair
Sent: 10 June 2015 17:13
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Pertec Tape Drive Interface Musings
On Jun 10, 2015, at 08:46, Al Kossow
On Jun 10, 2015, at 08:46, Al Kossow a...@bitsavers.org wrote:
On 6/10/15 8:15 AM, Mark J. Blair wrote:
And that is precisely why I'm thinking of an ad-hoc interface rather than
just plugging a SCSI drive into a UNIX box.
It also has the advantage that you can return the CRC/checksum
On 6/10/15 9:12 AM, Mark J. Blair wrote:
Ok, now three more questions come to mind:
1) Is it ever acceptable to mix densities on a single tape? I'm not sure that
my Kennedy drive will even allow that, but I don't know if that is universal.
It happens. Len Shustek's copy of APL/360 has
On 2015-06-10 16:32, Dennis Boone wrote:
I don't think it really is that you have a long gap when you rewrite
a bad block per se. But you get long gaps when you stop/start. And
a rewrite implies that you will get a stop/start situation. But in
case you already were going stop/start,
On 06/10/2015 09:40 AM, Al Kossow wrote:
It happens. Len Shustek's copy of APL/360 has JCL that switches from
1600 to 6250 after the label is written. None of my drives can deal with
that, incl the 9610.
I've never tried programatic density switching on the 9610, which is
supported.
Just
On 2015-Jun-09, at 4:07 PM, William Donzelli wrote:
Varian bought the design of the 620. I forget the name of the original
firm, but I have a brochure on it.
Weird things happen. CDC rebadged small VAX machines and Nova 3s, for
example, even with their minicomputer line intact.
On Tue, Jun
On 06/10/2015 12:36 PM, Johnny Billquist wrote:
One problem with preserving errors is that actual tapes do not have
any indication that you have a tape error. In fact, many times you can
recover a tape block by repeatedly read it. Eventually you might read it
without errors. Not to mention how
On 06/10/2015 11:12 AM, Mark J. Blair wrote:
On Jun 10, 2015, at 08:46, Al Kossow a...@bitsavers.org wrote:
On 6/10/15 8:15 AM, Mark J. Blair wrote:
And that is precisely why I'm thinking of an ad-hoc interface rather than just
plugging a SCSI drive into a UNIX box.
It also has the
I need to figure out why this program also doesn't deal with tape
errors well. If you get an error, it will go into an endless loop
creating -1 byte records.
Any block length with the high bit set is an error mark. The loop part
is a good question, though.
The discussion of .tap format
I particularly like the idea of being able to extract questionable
data and CRC/checksum.
That _would_ be really nice.
1) Is it ever acceptable to mix densities on a single tape? I'm not
sure that my Kennedy drive will even allow that, but I don't know if
that is universal.
As others
On Wed, Jun 10, 2015 at 12:11 AM, Chuck Guzis ccl...@sydex.com wrote:
Not complete off-topic, but I just received an email from Shaun Halstead
that he's looking to get rid of a CDC Keystone drive (vertically mounted)
(read: TU80 family, with Pertec interface) that was apparently used on a
Update: TZ30 located and ordered.
And now I'm thinking that I ought to build a custom Pertec interface (as is
being discussed in another thread) that's particularly suited for archival
work, though I might still be interested in a SCSI magtape drive or SCSI/Pertec
adapter anyway.
--
Mark J.
On Tue, 9 Jun 2015, Adrian Graham wrote:
Trying to source a non-DEC fan for a 4100 CPU since getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
Needed to rewire the plugs to
Thanks for the input everyone. In summary, I got recommendations for:
- HP 16500C (lesser a 16500B, but not a 16500A) (mainframe)
- HP 16700/16900/17500 (mainframe, bigger-faster-stronger, still pretty
expensive, can use 16500 cards)
- HP 166x or 167x (portable, modern, look for hard drive)
- HP
On 06/10/2015 01:13 PM, Richard Loken wrote:
On Tue, 9 Jun 2015, Adrian Graham wrote:
Trying to source a non-DEC fan for a 4100 CPU since getting them in the UK
is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
3-wire and I've found some almost-identical-but-not-quite
I guess it could possibly be useful to indicate a bad block on a
tape, in order to preserve the numbering of all the blocks, and
constantly giving a read error when used in a simulator. But it's
kindof a weird reflection of a physical error into a virtual one.
Unless you've corrected the
Earlier, I discussed how I've begun appending metadata to tape image
files after the EOM indicator. Thus far, no simulator chokes on
it. I really need to extend it.
I've seen software that doesn't understand EOM marks, though I think
it's never been one of the major simulators.
With that
all unperforated - ha ha ha! (obscure and lame reference to a line
in Flanders and Swann's 'Have some Madeira, M'dear!' that was
apparently too risque for the American sensibility ;-).
The Limeliters covered it in the US in 1961, so apparently not. :)
De
Asof now I know of two variations
1,Selector switch positions 1 and 6 lines can be vertical or
at an angle to the vertical
2,Vertical divider between groups of three lamps
Anybody seen an 8/e panel with anything else?
Rod
Bingo!
DZV11 FIELD MAINT PRINT SET MP00462
USERS GUIDE DZV11-UG-002
TECH MANUAL DZV11-TM-001
CVDZCB0 ECHO TEST DIAG
DVDZD-A-0 INTERPROCESSOR TEST DIAG
CVDZAD0 DIAG PART 1
might be more in there- too much fine
- Original Message -
From: Dennis Boone d...@msu.edu
To: General Discussion: On-Topic and Off-Topic
Posts cctalk@classiccmp.org
Sent: Wednesday, June 10, 2015 10:31 PM
Subject: Re: Madeirs (was 80 column (un)punched
cards)
The 'All unperforated...' line (my favourite)
was in the
Hey all --
I'm assisting in the restoration of an Altair 8800 system which includes
the MITS 88-HDSK (Altair Hard Drive Controller) and Pertec D-3422
removable pack/fixed platter drive and after cleaning everything up,
rebuilding supplies, etc, the drive spins up and goes Ready but all
The 'All unperforated...' line (my favourite) was in the English
versions but for some reason they (and the Limeliters) left it out of
the American version.
For the Limeliters, I don't believe I've ever heard it without. I'm
hardly an encyclopaedic reference to all their performances and
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