Hi
If the heads themselves have some rust, you need to polish
the heads a little before dragging tapes across it. The rust
pits will have sharp edges on them that will damage the tapes.
You should use a fine polishing compound, like jewelers rouge
or cerium oxide to burnish the edges so they don't do more
damage.
Dwight
>From: "Gooijen H" <GOOI(a)oce.nl>
>
>I would first check if the rust is actually from the metal of the
>head or just "rust" that has come off from an old tape ... that
>can probably be removed with a soft cloth.
>I am not so sure about using *any* fluid on the head!
>I do not have experience in this field, but don't those heads have
>a small slit / gap? (like all other magnetic heads)
>What will the fluid do when it get in that gap ...?
>
>- Henk.
>
>
>> -----Original Message-----
>> From: cctalk-bounces(a)classiccmp.org
>> [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Robert Krten
>> Sent: zaterdag 28 augustus 2004 12:40
>> To: cctech(a)classiccmp.org
>> Subject: Rust on tape heads
>>
>> I've noticed a few spots of rust on some TU55 tape heads that
>> I have. I'm wondering what I should do about it in the short
>> term -- I've had an idea of putting something on the heads
>> and then cleaning it off later, like oil or vaseline or... ?
>>
>> Any suggestions?
>>
>> Is there anything I can do with the heads later to clean the
>> rust off? Are they totally hosed, or will they still work?
>> This is on my "todo list" as far as restoration goes, just
>> haven't gotten to it yet, but wanted to prevent any further
>> damage if possible...
>>
>> Thanks in advance,
>> -RK
>>
>> [If replying to me personally by email, you'll need to click on
>> the URL that's mailed back to you to whitelist yourself.]
>> --
>> Robert Krten, PARSE Software Devices +1 613 599 8316.
>> Realtime Systems Architecture, Consulting, Books and Training
>> at www.parse.com
>> Looking for Digital Equipment Corp. PDP-1 through PDP-15
>> minicomputers!
>>
>
Hi Dan
We have a separate mail group specifically for H8/H89
and also a program archive. We are interested in disk
images as well. I have written a bootstrap method of bringing
a H8/H89 machine up from scratch with a serial cable and
some blank disk. This can also be used as a general disk image
transfer program.
We would like to get any information on your methods into
the archive and also images you may have.
Send a message to <majordomo(a)staunch89er.com> with body:
subscribe sebhc
To get to the mail group. It is a quite group right now
but the archives have a lot of good stuff.
Dwight
>From: "Dan Lanciani" <ddl-cctech(a)danlan.com>
>
>I've come up with a way to read Heath hard-sectored disks with a 1797-style
>controller (with some modifications). I've now archived all of my old disks
>with only one unrecoverable error in an unused sector (not bad for media that
>is approaching 30 years in age). I do seem to have run through *drives* at
>an alarming rate, though I hope that the cleaning disks I have on order will
>restore some of them. Is anyone interested in:
>
>-Technical details (the method should work for many non-standard FM formats)?
>
>-Having me read any H8 disks?
>
>-Any distribution images that I might have?
>
> Dan Lanciani
> ddl(a)danlan.*com
>
>From: "Jerry Schneider" <jerry.schneider(a)verizon.net>
>
>I found an email from you on the net regarding the Polymorphic 8813.
>
>Do you have any docs for this system? If so, would it be possible to
>purchase copies? Or, dupe originals if available?
>
>Thank you. I look forward to hearing from you soon.
>
> - jerry
Hi Jerry
I have a User's Guide and a copy of the Systems Programmers
Guide. I have some software as well. I've written a program
that handshakes with the Poly 8813's ftp program ( not
to be confused with todays ftp ). It can be used to
transfer programs/files to and from the Poly 8813. I don't
currently have a way to copy entire disk images but
if you have a bootable disk with the ftp, you can
transfer files ( using my program that requires a PC with
DOS ).
I have schematics for the CPU and video boards but
nothing for the RAM or disk controller cards.
Do you have an 5-1/4 drive machine or do you have
8 inch drives?
Email me directly and we can talk more.
Dwight
Hello,
My english is not so good. I hope, you can help me. I have from Ebay in
Germany a Realistic MPA 35A. I think he is good for Microphone and for
Music. I find of the Backside two Contact for Aux and for Phone Two Input
for Microphone. This Realistic is for 1 Speaker, its Mono. Where is a
contact for the Speaker?
I find many Contacts on the Backside. I have two Speakers 120 Watts 8 Ohm
>From the Speaker I have a red line and a black line. Where is the Contact
for the Speaker.
Thank you, for your Time
Berndt
Say, I don't believe we've heard from Joe since the hurricane in Florida.
I hope he's OK.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
I would first check if the rust is actually from the metal of the
head or just "rust" that has come off from an old tape ... that
can probably be removed with a soft cloth.
I am not so sure about using *any* fluid on the head!
I do not have experience in this field, but don't those heads have
a small slit / gap? (like all other magnetic heads)
What will the fluid do when it get in that gap ...?
- Henk.
> -----Original Message-----
> From: cctalk-bounces(a)classiccmp.org
> [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Robert Krten
> Sent: zaterdag 28 augustus 2004 12:40
> To: cctech(a)classiccmp.org
> Subject: Rust on tape heads
>
> I've noticed a few spots of rust on some TU55 tape heads that
> I have. I'm wondering what I should do about it in the short
> term -- I've had an idea of putting something on the heads
> and then cleaning it off later, like oil or vaseline or... ?
>
> Any suggestions?
>
> Is there anything I can do with the heads later to clean the
> rust off? Are they totally hosed, or will they still work?
> This is on my "todo list" as far as restoration goes, just
> haven't gotten to it yet, but wanted to prevent any further
> damage if possible...
>
> Thanks in advance,
> -RK
>
> [If replying to me personally by email, you'll need to click on
> the URL that's mailed back to you to whitelist yourself.]
> --
> Robert Krten, PARSE Software Devices +1 613 599 8316.
> Realtime Systems Architecture, Consulting, Books and Training
> at www.parse.com
> Looking for Digital Equipment Corp. PDP-1 through PDP-15
> minicomputers!
>
Hi all... I'm putting together a guidebook about IT careers for Vault.com (a
jobs and careers site here in New York). I'm writing the majority of the book
>from personal experience, but my editors asked me to solicit a few "day in the
life" sidebars from people in the field. The idea is that someone such as a
student can read the sidebars to get an idea of what you actually DO all day in
the role of (fill in your title).
I could use some submissions for jobs such as network engineers, SAN/backup
administrator, QA engineer, tech writer, product manager, etc. (already have
one from the programmer specialty). Basically you'd just write a fictional but
realistic hour-by-hour scenario of what your typical day is like.
It's up to you whether your name/company name are included. Of course, the
benefit to having your name/company name included is the free press and the
glory of pointing out your name in print, the next time you're in Barnes &
Noble with friends. :)
The catch? I need some of these sidebars as soon as humanly possible, in the
next couple of days.
Thanks in advance to anyone who can help!
- Evan
(PS -- please reply directly to me, let's NOT make this a discussion thread.)
The VT100 power supply has been spoken for (as have the keyboards). The
LA120 has tentatively been spoken for.
The next round of offerings will probably be a rather large amount of HP
21XX interface cards. They will be posted here soon as I go through and run
diags on each one (so they will all be known good boards). This will take
some time as there's about 150 boards I have to go through :\
I'm looking for 12880 cards, 12920/21 mux sets, FAB boards, FEM boards, and
12531 HS terminal cards. Also DG eclipse cards. Still looking for a DG 6031
floppy drive, and HP 264X terminals.
Regards,
Jay West
---
[This E-mail scanned for viruses by Declude Virus]
I have some ATM kit that needs to find a new home. It ideally needs to be
picked up from Cambridge UK but I can be flexible.
Not sure if this kit has reached the ten year limit yet, but the
fact that it's ATM fibre and is full of blinking lights surely makes
it interesting to this audience. A couple of quick pictures first:
http://www.heydon.org/kevan/pictures/newbridge-small.jpg
Same but bigger:
http://www.heydon.org/kevan/pictures/newbridge.jpg
What you are getting is a complete setup consisting of the central Route
Server (really a Sun SS20), a 12 port ATM Workgroup Switch and two 12 port
10/100Mbit ethernet Orange Ridges. All these are connected together with
fibre. I have the rack mounting brackets too.
It's all working fine and sat purring away, next to me at the moment.
Building work starts at home in a few weeks time and it has to be gone by
then.
--
Kevan
