17 Jul
2019
17 Jul
'19
2:38 p.m.
https://www.elecshopper.com/texas-instruments-ti-994a-computer-in-box-black-
and-silver.html
Only 4 of these on hand.
Cindy Croxton
Electronics Plus
1613 Water Street
Kerrville, TX 78028
830-370-3239 cell
sales at elecplus.com
---
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17 Jul
17 Jul
2:41 p.m.
Let's try that again with a shorter URL!
https://bit.ly/2JDLGeM
Cindy
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Electronics
Plus via cctalk
Sent: Wednesday, July 17, 2019 4:39 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: TI99/4A computers, in original boxes
https://www.elecshopper.com/texas-instruments-ti-994a-computer-in-box-black-
and-silver.html
Only 4 of these on hand.
Cindy Croxton
Electronics Plus
1613 Water Street
Kerrville, TX 78028
830-370-3239 cell
sales at elecplus.com
---
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19 Jul
19 Jul
8:22 p.m.
New subject: Scotch 777 "blue label" tape blues confirmed
This is in reference to my earlier post about Scotch 777 half-inch
open-reel tapes. I'd reported that I encountered a tape that displayed
binder bleed, such that the tape would stick to the heads and guides.
This was a tape that had been both baked and cleaned.
Coating the tape with a film of cyclomethicone allowed it to be
successfully read.
In the latest batch of tapes, I found another one--it behaves identically.
These appear to be only the blue foil-labeled 777s; the yellow paper
labeled ones are fine.
I estimate the manufacture date to be about 1969-70.
FWIW,
Chuck
8:59 p.m.
New subject: Scotch 777 "blue label" tape blues confirmed
same as sticky shed syndrome?
On Fri, Jul 19, 2019 at 10:22 PM Chuck Guzis via cctalk <
cctalk at classiccmp.org> wrote:
This is in reference to my earlier post about Scotch
777 half-inch
open-reel tapes. I'd reported that I encountered a tape that displayed
binder bleed, such that the tape would stick to the heads and guides.
This was a tape that had been both baked and cleaned.
Coating the tape with a film of cyclomethicone allowed it to be
successfully read.
In the latest batch of tapes, I found another one--it behaves identically.
These appear to be only the blue foil-labeled 777s; the yellow paper
labeled ones are fine.
I estimate the manufacture date to be about 1969-70.
FWIW,
Chuck
11:08 p.m.
New subject: Scotch 777 "blue label" tape blues confirmed
On 7/19/19 8:59 PM, Adrian Stoness wrote:
same as sticky shed syndrome?
No, not exactly--it's more like binder bleed-through. The oxide remains
firmly attached to the base, but there is a film of either gummified
lubricant or binder that fouls up things.
Normally, if it's sticky-shed, the tape sticks to itself, but that isn't
the case--the tape despools and spools quite easily on its own, but
leaves deposits on any stationary surfaces that it glides over--and
adheres to those. Isopropanol seems to clean deposits from heads and
guides; no oxide is left behind.
So a coating of cyclomethicone renders the tape non-sticky for a time.
It's bizarre and seems to be related to this particular type of tape.
--Chuck
9:38 a.m.
New subject: Scotch 777 "blue label" tape blues confirmed
On 7/20/19 9:24 AM, Dennis Boone via cctalk wrote:
A thick (1/4") felt strip glued to a large PVC pipe cap with a few small
(#60) holes drilled in it to dispense the lubricant. Just put this in
the tape path of your cleaning machine on the rewind cycle.
--Chuck
Coating the
tape with a film of cyclomethicone allowed it to be
successfully read.
I'm curious what mechanism you use for the coating? 
10:18 a.m.
New subject: Scotch 777 "blue label" tape blues confirmed
On Jul 20, 2019, at 9:38 AM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
your cleaning machine
I do not have a cleaning machine. Do you suppose a cyclomethicone applicator fabricobbled
into the tape path of a tape drive might work?
I haven't encountered these sorts of issues in 9-track tapes yet, but I've
certainly been frustrated with binder bleed and/or sticky shed when I tried to mess with a
TK50 drive.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/
11:54 a.m.
New subject: Scotch 777 "blue label" tape blues confirmed
On 7/20/19 10:18 AM, Mark J. Blair via cctalk wrote:
I don't think that would be a problem. The stuff is inert and somewhat
volatile (somewhere around the volatility of water), so it will
evaporate eventually. It leaves no residue. Just don't spill it on the
floor or you'll have your own private slip'n'slide right there in your shop.
I've even used the stuff to recover data from those dreadful 5.25"
Wabash floppies.
--Chuck
On Jul 20, 2019, at 9:38 AM, Chuck Guzis via
cctalk <cctalk at classiccmp.org> wrote:
your cleaning machine
I do not have a cleaning machine. Do you suppose a cyclomethicone applicator fabricobbled
into the tape path of a tape drive might work?
I haven't encountered these sorts of issues in 9-track tapes yet, but I've
certainly been frustrated with binder bleed and/or sticky shed when I tried to mess with a
TK50 drive.
6 Aug
6 Aug
10:10 p.m.
New subject: Scotch 777 "blue label" tape blues confirmed
On 7/20/19 10:18 AM, Mark J. Blair via cctalk wrote:
>> On Jul 20, 2019, at 9:38 AM, Chuck Guzis via cctalk
>> <cctalk at classiccmp.org> wrote:
> >> your cleaning machine
> I do not have a cleaning machine. Do you
suppose a cyclomethicone
> applicator fabricobbled into the tape path of a tape drive might
> work?
> I haven't encountered these sorts of
issues in 9-track tapes yet, but
> I've certainly been frustrated with binder bleed and/or sticky shed
> when I tried to mess with a TK50 drive.
Just shipped the last batch of tapes back--there were no fewer than six
of those buggers in it--all had sticky/bleed whatever. Cyclomethicone
did the trick on all six. These were all from between 1969-74.
--Chuck
1916
days inactive
1937
days old
9 comments
5 participants
participants (5)
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