Lee, have you looked up the pKa for methanol?
Verzonden vanaf mijn BlackBerry 10-smartphone.
Origineel bericht
Van: Lee Gleason
Verzonden: zaterdag 17 mei 2014 22:17
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] TK50 issues
Methanol would do as well but is more poisonous.
Careful with methanol - it's a more potent solvent in general than ethanol
or isopropanol. Lots of rubber and plastic compounds are attacked by
methanol.
Additionally, the H in the OH group isn't held onto as tightly as in the
other organic OH compounds, so methanol is corrosive to metal.
It's also a middlin' good oxidizer for some metals.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
Methanol would do as well but is more poisonous.
Careful with methanol - it's a more potent solvent in general than ethanol or isopropanol. Lots of rubber and plastic compounds are attacked by methanol.
Additionally, the H in the OH group isn't held onto as tightly as in the other organic OH compounds, so methanol is corrosive to metal.
It's also a middlin' good oxidizer for some metals.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
On 4 May 2014, at 03:41, Mark Abene <phiber at phiber.com> wrote:
I was emulating a full cisco 7206VXR in dynamips/dynagen on my linux/ARM
Okay, I want to get this up and going but I have ZERO experience on Cisco, IOS or anything that emulates it. Google results are a bit confusing, so some pointers would be greatly appreciated!
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
On 2014-05-17 20:19, Brian Schenkenberger, VAXman- wrote:
Johnny Billquist <bqt at softjar.se> writes:
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the
TK50. :-)
Hopefully, your Exabyte isn't the 8200. ;)
I never remember if it is an 8200 or an 8500. Either way, it's been working fine for the last 20 years or so... :-)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
On 05/17/2014 02:19 PM, Brian Schenkenberger, VAXman- wrote:
Hopefully, your Exabyte isn't the 8200. ;)
Wha. WHAT. No. NO. NOOOOOOO!!!
YYAAAAAAAAAAAAA!! *BLAM!* (<-- head explodes)
--
Dave McGuire, AK4HZ
New Kensington, PA
Johnny Billquist <bqt at softjar.se> writes:
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the
TK50. :-)
Hopefully, your Exabyte isn't the 8200. ;)
--
VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)ORG
I speak to machines with the voice of humanity.
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the TK50. :-)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives that occasionally decided to not give the cartridge back, and I have had to extract them and manually rewind the tape in (boring as hell), but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is confusing. The TK70 is better... And TK50 exists in different firmware revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E install media on that.
Johnny
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
On 2014-05-17 19:33, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
Others have replied, but anyway.
Yes, you need to clean the TK50. Almost certain that is your problem.
And cleaning them is easy. Open the box, so that you can see the
drive. There is a cover plate over the drive, fastened by four screws.
Remove the cover plate and you'll see the head, the rollers, and the
pickup hub.
Use iso-propanol and a swab, and just clean the head.
Reassemble, and you're done.
Johnny
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives that occasionally decided to not give the cartridge back, and I have had to extract them and manually rewind the tape in (boring as hell), but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is confusing. The TK70 is better... And TK50 exists in different firmware revisions, and some are quirkier than others.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
On 2014-05-17 18:59, Brian Schenkenberger, VAXman- wrote:
Johnny Billquist <bqt at softjar.se> writes:
On 2014-05-11 05:11, Cory Smelosky wrote:
Evening all,
Got a nice haul of equipment today...aside from the TK50 issues and the
smoking VT340 everything seems to be okay!
However:
CARTRIDGE PRESENT
HEAD AT TRACK ZERO
POSITIONED AT BOT
TRK NUMBER 00
LOGICAL TRACK NUMBER = 0.
PHYSICAL BLK# 0000
PHYSICAL BLOCK NUMBER = 0.
LOGICAL BLK# 00
LOGICAL BLOCK NUMBER = 0.
TAPE POSITION 000EFB
TAPE POSITION = 3835.
DRIVE STATE 035E
RD/WRT STATE 1937
OPERATION FLGS 0201
CNTRLR STATUS 0C
DRIVE ERROR
DRIVE ERR CODE 93
AMPLITUDE ON HEAD 2 TOO LOW
and an error about it being unable to find calibration track 2 on the
second drive lead me to believe the drives may be faulty. The leader
isn't broken and I've reattached it to the arm on the one where it had
come off.
How would I do about cleaning one? Are the drives bad and a cleaning
wouldn't help?
(Yes, I tried multiple cartridges)
Others have replied, but anyway.
Yes, you need to clean the TK50. Almost certain that is your problem.
And cleaning them is easy. Open the box, so that you can see the drive.
There is a cover plate over the drive, fastened by four screws. Remove
the cover plate and you'll see the head, the rollers, and the pickup hub.
Use iso-propanol and a swab, and just clean the head.
Reassemble, and you're done.
Try ethanol instead! "Rubbing" ethanol is available at most drug stores
along side isopropanol. This is, of course, denatured so that it can not
(or should not) be consumed. If you want the purest, off to the liquor
store and get yoruself a bottle of grain alcohol (Everclear is one brand
names of pure grain alcohol). It's what I use simply because I've never
sussed out what is used as the denaturing addative with the drug store's
ethanol.
Isopropanol can oxidize producing a ketone. The ketone that it oxidizes
into is acetone. Not what I would prefer to have on the rubber (real or
otherwise) conponents nor to come in contact with my tapes. Depending on
what is gunked up in your TK50, some of those chemicals may suffice as a
catalyst in the oxidation thereof.
I do know that the tech wipes (small pouches with alcohol dampened cloth
or paper) we used back in the day were ethanol based. Perhaps, for this
very reason?
I have bottles from DEC saying "Tape cleaning fluid", and it's Isopropanol. All my manuals for various hardware also always say to clean using Isopropanol, so I think Isopropanol is a safe bet to use. :-)
However, pure ethanol should not be a problem either, unless it actually might be to aggressive in dissolving things.
My main concerns with ethanol would be how aggressive it might be, and secondly any possible residue left behind id it wasn't pure. I would like to have something that is at least 96% ethanol if I were to use that for cleaning. (You won't find that in normal stores in Sweden at least, since it's dangerous to consume as it is, and diluting it with water would mean you'd get a lot of alcohol without going through the state monopoly. :-) Denatured it's available at special stores, but still not my first choice then, since the denaturing is also additives that I do not want left as residue.)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
