> On Mar 8, 2023, at 7:25 AM, Bill Gunshannon via cctalk
> wrote:
>
>
> On 3/7/2023 8:30 PM, Dennis Boone via cctalk wrote:
>> > I’m working on a project, and I need to know the age of various tape
>> > formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
>> > cartridges
On 3/10/23 06:14, Paul Koning via cctalk wrote:
>> Hub size looks small on the 1/2" for later style tapes. 2" tape? I wonder
>> if that was linear? Had to have impressive motors.
>
> Early on the hub specs tended to vary. For example, the EL-X1 10-track 1/2
> inch tape uses 1/2 inch
> On Mar 10, 2023, at 8:44 AM, Sellam Abraham via cctalk
> wrote:
>
> A good resource for data on issues like this is the scans of old computer
> magazines or catalogs in either Google Books or the Internet Archive.
>
> Sellam
Good idea, just need to get my google-fu working right. :-)
On Fri, Mar 10, 2023 at 8:06 AM Zane Healy via cctalk
wrote:
> > On Mar 8, 2023, at 11:36 AM, Tom Gardner via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > I’ve worked on tape articles in Wikipedia and they are for the most part
> pretty good. If u find any errors or omissions I hope u will
> On Mar 8, 2023, at 11:36 AM, Tom Gardner via cctalk
> wrote:
>
> I’ve worked on tape articles in Wikipedia and they are for the most part
> pretty good. If u find any errors or omissions I hope u will update
>
> If you are willing and able to share I’d like to see yr results
>
> Good luck
> On Mar 10, 2023, at 2:30 AM, jim stephens via cctalk
> wrote:
>
>
>
> On 3/10/23 00:16, Chuck Guzis via cctalk wrote:
>> I believe that this photo shows a Datamatic 1000 tape next to a standard
>> 1/2" drive.
>>
>> https://i.pinimg.com/564x/00/3e/7d/003e7d4e3a2478db0b9a7c94f2033252.jpg
On 3/9/23 23:30, jim stephens via cctalk wrote:
>
>
> On 3/10/23 00:16, Chuck Guzis via cctalk wrote:
>> I believe that this photo shows a Datamatic 1000 tape next to a standard
>> 1/2" drive.
>>
>> https://i.pinimg.com/564x/00/3e/7d/003e7d4e3a2478db0b9a7c94f2033252.jpg
>>
>> --Chuck
>>
> Hub
That reel of 3 onch tape is heavy... Ihave a reel and the 30 something track
tape headgee I could rig a rrader ed#
Sent from AOL on Android
On Thu, Mar 9, 2023 at 11:16 PM, Chuck Guzis via cctalk
wrote:
I believe that this photo shows a Datamatic 1000 tape next to a standard1/2"
drive.
On 3/10/23 00:16, Chuck Guzis via cctalk wrote:
I believe that this photo shows a Datamatic 1000 tape next to a standard
1/2" drive.
https://i.pinimg.com/564x/00/3e/7d/003e7d4e3a2478db0b9a7c94f2033252.jpg
--Chuck
Hub size looks small on the 1/2" for later style tapes. 2" tape? I
wonder
I believe that this photo shows a Datamatic 1000 tape next to a standard
1/2" drive.
https://i.pinimg.com/564x/00/3e/7d/003e7d4e3a2478db0b9a7c94f2033252.jpg
--Chuck
I'll toss a couple of old IBM magtape variations out:
The IBM 728, used on SAGE. 7 track, but not your daddy's 7 track. 3
data tracks either side of a central clock track. Different from either
of the pre- and post-series drives (727 and 729) that we have grown to love.
And, of course, the
> On Mar 8, 2023, at 10:23 PM, Chris Elmquist via cctalk
> wrote:
>
>
>
>> On Mar 8, 2023, at 4:18 PM, Chuck Guzis via cctalk
>> wrote:
>>
>> On 3/8/23 13:53, Sellam Abraham via cctalk wrote:
On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via cctalk
wrote:
On
On 3/8/2023 1:19 PM, Dave Wade G4UGM via cctalk wrote:
-Original Message-
From: Chuck Guzis via cctalk
Sent: Wednesday, March 8, 2023 6:08 PM
To: cctalk@classiccmp.org
Cc: Chuck Guzis
Subject: [cctalk] Re: Age of Tape Formats?
I think it remarkable in retrospect that the original
On 3/8/23 22:23, Chuck Guzis via cctalk wrote:
On 3/8/23 19:23, Chris Elmquist wrote:
Who can read them now? ;-)
I suppose that you could rig something up as a streaming rig, but the
metal was murder on heads; the Univservo I interposed a thin plastic
tape between the metal and the head.
On 3/8/23 19:23, Chris Elmquist wrote:
> Who can read them now? ;-)
I suppose that you could rig something up as a streaming rig, but the
metal was murder on heads; the Univservo I interposed a thin plastic
tape between the metal and the head. Fortunately, the density was
pretty low.
Not
> On Mar 8, 2023, at 4:18 PM, Chuck Guzis via cctalk
> wrote:
>
> On 3/8/23 13:53, Sellam Abraham via cctalk wrote:
>>> On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via cctalk
>>>
>>> wrote:
>>>
>>> On the subject of 1/2" open-reel tape, I note that the tapes initially
>>> used with the
On Wed, Mar 8, 2023 at 2:16 PM Chuck Guzis via cctalk
wrote:
> On 3/8/23 13:53, Sellam Abraham via cctalk wrote:
> > On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via cctalk <
> cctalk@classiccmp.org>
> > wrote:
> >
> >> On the subject of 1/2" open-reel tape, I note that the tapes initially
> >>
On 3/8/23 13:03, Dennis Boone via cctalk wrote:
> Wow! I'd love to see the 1971 vintage GCR tape controller, it must
> have been the size of a 360 CPU! We had a GCR controller from
> Storage Tech. in 1982 or so that was the same size as a PDP 11/44
> large cabinet. CDC Keystone drives
On Mar 8, 2023, at 10:07 AM, Chuck Guzis via cctalk
wrote:
>
> I think it remarkable in retrospect that the original Star Trek (ca.
> 1966) used countless mentions of "computer tapes" in the 23rd century.
>
> A lack of foresight on the part of the script writers?
>
> What can we predict for
> On Mar 8, 2023, at 8:31 AM, Jon Elson via cctalk
> wrote:
>
> On 3/7/23 22:34, Zane Healy via cctalk wrote:
>>
>> I’ll be the first to admit my question is a bit strange. Basically I’m
>> trying to use the date that various media types were first introduced to
>> show the oldest
On 3/8/23 13:53, Sellam Abraham via cctalk wrote:
> On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via cctalk
> wrote:
>
>> On the subject of 1/2" open-reel tape, I note that the tapes initially
>> used with the IBM 726 drive (1952) used a cellulose acetate base. In
>> 1956, a switch was made to
On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via cctalk
wrote:
> On the subject of 1/2" open-reel tape, I note that the tapes initially
> used with the IBM 726 drive (1952) used a cellulose acetate base. In
> 1956, a switch was made to Mylar. That's unfortunate, since early
> existing 726
On the subject of 1/2" open-reel tape, I note that the tapes initially
used with the IBM 726 drive (1952) used a cellulose acetate base. In
1956, a switch was made to Mylar. That's unfortunate, since early
existing 726 tapes have almost certainly rotted away due to vinegar
syndrome.
--Chuck
Tom,
What an excellent bibliography for the topic.
Thank you.
Sellam
On Wed, Mar 8, 2023 at 11:45 AM Tom Gardner via cctalk <
cctalk@classiccmp.org> wrote:
> If you want authoritative sources I highly recommend:
>
> *IBM J. RES. DEVELOP. • VOL. 25 • NO. 5 • SEPTEMBER 1981, has an
>
If you want authoritative sources I highly recommend:
*IBM J. RES. DEVELOP. • VOL. 25 • NO. 5 • SEPTEMBER 1981, has an
article “Innovations in the Design of Magnetic Tape Subsystems”
*IBM Journal of Research and Development Vol. 47, No. 4, July 2003 has
an article “Fifty years
> Wow! I'd love to see the 1971 vintage GCR tape controller, it must
> have been the size of a 360 CPU! We had a GCR controller from
> Storage Tech. in 1982 or so that was the same size as a PDP 11/44
> large cabinet. CDC Keystone drives (92185) had it integrated into
> the 680x controller
On 2023-03-08 11:07 a.m., Chuck Guzis via cctalk wrote:
I think it remarkable in retrospect that the original Star Trek (ca.
1966) used countless mentions of "computer tapes" in the 23rd century.
A lack of foresight on the part of the script writers?
What can we predict for the year 2250?
I hate to throw a spanner in the works but no one has mentioned U-Matic
tapes. Normally used for video recording the early CD audio and CD-Rom
industry encoded the digital image on to U-Matic tapes which were then
used to drive the laser for writing to the CD Master.
On 3/8/2023 11:42 AM,
On Wed, Mar 8, 2023 at 6:12 AM Paul Koning via cctalk
wrote:
>
> I'm not familiar with PLATO cassettes. Are those attached to terminals?
> The oldest data cassettes I know of are on the TI Silent 733 terminals --
> which were thought of as paper tape emulation done on audio cassettes, at
> 300
On 3/8/23 10:19, Dave Wade G4UGM via cctalk wrote:
>
> Yes, but Space 1999 still had slide rules..
I thought this discussion by one of the JPL people working on the tape
mechanism for Voyager (1980) might be interesting to some:
> -Original Message-
> From: Chuck Guzis via cctalk
> Sent: Wednesday, March 8, 2023 6:08 PM
> To: cctalk@classiccmp.org
> Cc: Chuck Guzis
> Subject: [cctalk] Re: Age of Tape Formats?
>
> I think it remarkable in retrospect that the original Star Trek (ca
I think it remarkable in retrospect that the original Star Trek (ca.
1966) used countless mentions of "computer tapes" in the 23rd century.
A lack of foresight on the part of the script writers?
What can we predict for the year 2250?
--Chuck
On 3/8/23 09:42, Paul Koning wrote:
> Second, I would consider a format to be significant if it had a major market
> presence and major place in the technology space. In that sense, DECtape I
> clearly belongs -- being either the primary or a significant secondary
> storage device for a
> On Mar 8, 2023, at 12:20 PM, Chuck Guzis via cctalk
> wrote:
>
> On 3/8/23 06:19, Paul Koning wrote:
>
>
>> I wouldn't exclude those, certainly not if they are relevant to the
>> evolution of the technology. Are X1 tapes (and Eliott tapes if they are the
>> same format, which I don't
On 3/8/23 06:19, Paul Koning wrote:
> I wouldn't exclude those, certainly not if they are relevant to the evolution
> of the technology. Are X1 tapes (and Eliott tapes if they are the same
> format, which I don't know) in some way anticipating LINCtape and DECtape?
> Are they an independent
On 3/8/23 05:33, Dave Wade G4UGM via cctalk wrote:
Our Honeywell H3200 had 1200BPI NRZI 7-track drives.
http://www.bitsavers.org/pdf/honeywell/datapro/70C-480-01_7404_Honeywell_200_2000.pdf
page 13 onwards... Needed chrome tape
Dave
The reason NRZI topped out at 800 BPI on 9-track
Speaking of compatibility, we had a 360/50 many ages ago,
and it was "permitted" to put the tape controller on the
multiplexer channel. This prevented long tape operations
from locking up the disk controller on the selector
channel. The model /50 only had one selector. But, if
there was
On 3/7/23 22:34, Zane Healy via cctalk wrote:
I’ll be the first to admit my question is a bit strange. Basically I’m trying
to use the date that various media types were first introduced to show the
oldest possible date for a bunch of media I’m trying to date. The 9-Track
tapes have been
> On Mar 8, 2023, at 10:07 AM, Bill Gunshannon
> wrote:
>
>
> On 3/8/2023 9:11 AM, Paul Koning wrote:
>>
>>> On Mar 8, 2023, at 7:25 AM, Bill Gunshannon via cctalk
>>> wrote:
>>>
>>>
>>> On 3/7/2023 8:30 PM, Dennis Boone via cctalk wrote:
> I’m working on a project, and I need to
On 3/8/2023 9:11 AM, Paul Koning wrote:
On Mar 8, 2023, at 7:25 AM, Bill Gunshannon via cctalk
wrote:
On 3/7/2023 8:30 PM, Dennis Boone via cctalk wrote:
> I’m working on a project, and I need to know the age of various tape
> formats. For example when were 6250bpi 700’ 9-Track
> On Mar 8, 2023, at 7:25 AM, Bill Gunshannon via cctalk
> wrote:
>
>
> On 3/7/2023 8:30 PM, Dennis Boone via cctalk wrote:
>> > I’m working on a project, and I need to know the age of various tape
>> > formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
>> > cartridges
Some information about the origin of CUTS here :
https://retrocomputing.stackexchange.com/questions/8099/whats-the-difference-between-kansas-city-tape-standard-and-cuts
I recall a Logabax computer (a french office / accounting system that seems
to e completely forgotten) in about 1975 that had a
On 3/7/2023 8:30 PM, Dennis Boone via cctalk wrote:
> I’m working on a project, and I need to know the age of various tape
> formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
> cartridges introduced? Is there any good resource online that
> documents this?
> -Original Message-
> From: Zane Healy via cctalk
> Sent: Wednesday, March 8, 2023 4:35 AM
> To: General Discussion: On-Topic and Off-Topic Posts
> Cc: Zane Healy
> Subject: [cctalk] Re: Age of Tape Formats?
>
> On Mar 7, 2023, at 5:32 PM, Paul Koning via ccta
On 3/7/23 20:34, Zane Healy via cctalk wrote:
> On Mar 7, 2023, at 5:32 PM, Paul Koning via cctalk
> wrote:
>>
>> I'm a bit puzzled by "6250 700'" because the reel size has no bearing on the
>> format. 10 inch reels (1200 feet) were by far the most common but
>> occasionallly the smaller 600
On Mar 7, 2023, at 5:32 PM, Paul Koning via cctalk
wrote:
>
> I'm a bit puzzled by "6250 700'" because the reel size has no bearing on the
> format. 10 inch reels (1200 feet) were by far the most common but
> occasionallly the smaller 600 foot ones would be seen. and in rare cases (the
>
On 3/7/23 17:32, Paul Koning wrote:
>
>
>> On Mar 7, 2023, at 8:23 PM, Chuck Guzis via cctalk
>> wrote:
>>
>> On 3/7/23 17:04, Zane Healy via cctalk wrote:
>>> I’m working on a project, and I need to know the age of various tape
>>> formats. For example when were 6250bpi 700’ 9-Track tapes
On 2023-03-07 20:23, Chuck Guzis via cctalk wrote:
On 3/7/23 17:04, Zane Healy via cctalk wrote:
I’m working on a project, and I need to know the age of various tape formats.
For example when were 6250bpi 700’ 9-Track tapes or DC600A cartridges
introduced? Is there any good resource online
> On Mar 7, 2023, at 8:23 PM, Chuck Guzis via cctalk
> wrote:
>
> On 3/7/23 17:04, Zane Healy via cctalk wrote:
>> I’m working on a project, and I need to know the age of various tape
>> formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
>> cartridges introduced? Is
> I’m working on a project, and I need to know the age of various tape
> formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
> cartridges introduced? Is there any good resource online that
> documents this? Wikipedia is of some help, but the older you go, the
> spottier it
On 3/7/23 17:04, Zane Healy via cctalk wrote:
> I’m working on a project, and I need to know the age of various tape formats.
> For example when were 6250bpi 700’ 9-Track tapes or DC600A cartridges
> introduced? Is there any good resource online that documents this?
> Wikipedia is of some
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