On 04/06/2016 07:22 PM, Fred Cisin wrote:
> How long were they supposed to last? Will they honor those "lifetime
> guarantee"s?
Kodak, when it was entering the market with floppy media, even offered
to recover data from bad (Kodak) floppies. That offer, obviously didn't
last very long.
--Chuck
*some restrictions apply :-)
Evan Koblentz pointed me to a rescue here in the triangle, NC area back in
August 2015. Some items were set aside for VCFed, but there were A LOT of
books and other media that were up for grabs. Because I'm a sucker, I took
and then carefully cleaned and catalogued the
Hi classiccmp'ers.
VCF East starts in just 8 days from now.
It's at the InfoAge Science Center in Wall, New Jersey, USA.
Three keynotes: John Blankenbaker (Friday), Stewart Cheifet (Saturday),
Ted Nelson (Sunday).
Three dozen hands-on exhibits.
TWO original Apple 1 computers, including one
Well that was fast and easy. Thank goodness.
It turns out the culprit was the Astec power supply. It had a dry
solder joint on the "DC OK" line. A few drops of fresh solder later
and the terminal is good as new (well, as good as any 35-year-old
terminal can be, anyway)
While I was inside, I remov
On 04/06/2016 08:00 PM, Paul Koning wrote:
On Apr 6, 2016, at 5:18 PM, Chuck Guzis wrote:
Well, I don't know about the consensus, but in my experience, most
floppies go bad from wear and/or breakdown in the binder.
I have no experience with this issue in floppies. But I have a distressingly l
On 04/06/2016 06:00 PM, Paul Koning wrote:
> I have no experience with this issue in floppies. But I have a
> distressingly large quantity of audio cassettes that have gone bad
> over 10 or 20 years. It wasn't wear; they weren't played regularly.
> Instead, something bad happened with the struct
>
> The "SL0227 / 404780" part appears to be a Zilog Z80 CPU of some kind,
The '404780' number looks a bit like a Teletype part number...
IIRC the Z80 has very odd positions for the power and ground pins, you
should be able to verify that it is a Z80 from that. Then stick a 'scope
or counter on
Wear happens. Particularly on directory tracks, or where you encounter
the snake in Adventure.
But, that doesn't account for the loss of data over time.
Entropy: Could the rust on the cookie be de-oxidizing, and turning back
into non-oxidized ferrous compounds? :-)
How long were they supp
On 04/06/2016 10:20 AM, Swift Griggs wrote:
When left in an unprotected state, or a poor environment, damp, mold and
dust can damage the surface, either degrading the magnetic layer or
causing the gap to shrink enough that the drive head physically damages
the disk?
Gap? There IS no gap on a sta
> On Apr 6, 2016, at 8:55 PM, Geoff Oltmans wrote:
>
> On a related note... What causes an old mfm / roll drive to die if the heads
> aren't touching the surface except in the landing zone?
>
> I have read that it's not impossible for the "pigment" to lose its coercivity
> over time.
I would
> On Apr 6, 2016, at 5:18 PM, Chuck Guzis wrote:
>
> Well, I don't know about the consensus, but in my experience, most
> floppies go bad from wear and/or breakdown in the binder.
I have no experience with this issue in floppies. But I have a distressingly
large quantity of audio cassettes
> On Apr 6, 2016, at 3:15 PM, JP Hindin wrote:
>
>
> I had one of those Japanese Koan moments recently when someone asked me "Why
> do floppy disks stop working?" and I realised I... didn't actually know. I
> thought I'd throw it to the group and get some theories/proofs.
>
> Let's work on t
Hi list,
the 17th edition of VCF Europe[0] is coming soon! It will take place on
April 30th and May 1st in Munich, Germany. Please be aware that the
information on the English version of the website might be outdated or
less detailed than on the German page, but Google Translate will help.
Also t
Il giorno mer, 06/04/2016 alle 21.59 +0200, supervinx ha scritto:
> Ah, sad and bad news...
> Transferred ICP.TSK as usual and checked it with DMP (between simh and
> the MicroPDP).
> Gave it a try, but got a system crash.
> I suspect that the Indirect Command Processor is tightly linked with the
>
* On Wed, Apr 06, 2016 at 03:11:54PM -0600, Eric Smith
wrote:
> SL0227 is a house number, and isn't likely to mean anything to anyone.
> It might be a Z80, but it could just as easily be a mask-programmed
> Z8.
This is good information.
I did measure a 3.3MHz clock signal on pin 6, which leads
Well, I don't know about the consensus, but in my experience, most
floppies go bad from wear and/or breakdown in the binder. It's
sometimes possible to "renew" a bad disk for use by either AC degaussing
or use of a strong DC field, but given the cost of the media, it's
scarcely worth the trouble.
On Wed, 6 Apr 2016, JP Hindin wrote:
> - Repeated use slowly wears away the magnetic media layer on the mylar.
There is no doubt that there is some friction there. However, I'd be
surprised if this was the chief cause.
> When left in an unprotected state, or a poor environment, damp, mold and
>
> Another curious thing is this...
> Dumping the first block with DMP or a Linux/DOS tools gives different
> results.
> For example:
> DMP
> ===
> B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B12 B13 B14 B15 B16
> Linux/DOS
> =
> B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1
> Byte se
SL0227 is a house number, and isn't likely to mean anything to anyone.
It might be a Z80, but it could just as easily be a mask-programmed
Z8.
Noel wrote:
>
> My brain did eventually turn on, and I remembered DEC's habit of
putting
> prints for included devices in with print sets for computers, and with
that in
> mind, I managed to locate another set in the -11/34A print set; that
one is a
> lot clearer.
>
> Anyway, the version in the -
I had one of those Japanese Koan moments recently when someone asked me
"Why do floppy disks stop working?" and I realised I... didn't actually
know. I thought I'd throw it to the group and get some theories/proofs.
Let's work on the assumption we're talking about 5.25" and 3.5" disks.
Sever
Ah, sad and bad news...
Transferred ICP.TSK as usual and checked it with DMP (between simh and
the MicroPDP).
Gave it a try, but got a system crash.
I suspect that the Indirect Command Processor is tightly linked with the
kernel...
Another curious thing is this...
Dumping the first block with DMP
On Mon, Apr 4, 2016 at 7:07 AM, Maciej W. Rozycki
wrote:
> On Sun, 3 Apr 2016, Pete Lancashire wrote:
>
> > I'll soon be powering up a HP 9000/310 (98561-66525) but do not have an
> a
> > single monochrome monitor.
> >
> > Suggestions ?
>
> I've had success with a NEC MultiSync LCD2090UXi monito
On 2016-04-06 20:26, paul_kon...@dell.com wrote:
While looking for DECnet documents, I noticed that there's a very large
collection at http://manx.classiccmp.org/collections/antonio/dec/ . Probably
not news to many, but in case some had not seen it...
Among other things, there are two CD coll
While looking for DECnet documents, I noticed that there's a very large
collection at http://manx.classiccmp.org/collections/antonio/dec/ . Probably
not news to many, but in case some had not seen it...
Among other things, there are two CD collections MDS-1997-10 and MDS-2000-01.
The former c
Hi,
The board layout is complete and has passed all of the design rule checks from
the board house. I’ll be ordering some boards for me to assemble and test next
week.
I have also received a quote for “turnkey assembly” where I hand them the files
and get back fully assembled boards. In order t
One more quick question about this.
Here's a close-up of the CPU and IO support chips on the terminal main
board:
http://i.imgur.com/6ZXwcLm.jpg
The "SL0227 / 404780" part appears to be a Zilog Z80 CPU of some kind,
but I've never seen those markings. The MOSTEK parts are Z80 SIO and
Z80 CTC
On 06/04/16 15:38, Dave Wade wrote:
I wish I had such an inventory of my collection
I wish I had a 4000sqm building nearby :-)
I'm much more likely to (eventually) build up an inventory of the stuff
I do have (that's just time and effort ...).
Antonio
--
Antonio Carlini
arcarl...@iee.o
Hi Guys
PDP-8/e A panels now shipping
PDP 8/e B panels ship on Friday
PDP-8/ f and /m ship on 14th
I have some extras of the above if you are quick.
Rod (Panelman) Smallwood
I wish I had such an inventory of my collection
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Pontus
> Sent: 06 April 2016 11:32
> To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off-
> Topic Posts
> Subject: Re: A computer
On Wed, 6 Apr 2016 09:08:55 -0400 (EDT)
j...@mercury.lcs.mit.edu (Noel Chiappa) wrote:
--snip--
> Anyway, the version in the -11/34A prints didn't include the actual
> front console, plus to which the prints there had been heavily marked
> up by someone at some point. So I have produced a new se
So I'm in the process of repairing a couple of M7859 KY11-LB -11/04-34
Programmer's Console boards, and the existing FM Print Set was kind of hard to
read in some areas, so I looked online for another set, and although I didn't
find one, I noticed several other people with the same issue - asking f
>> The closest RSX11M (not Plus) distribution I can find is an RL01
>> distribution of RSX11M V4.1
>> Since it is disk and not tape it can be directly booted with Simh and it
>> does have a ICP.TSK
>> that should be pretty compatible with V4.2 since it is from V4.1 Baseline.
>> You can fi
On 04/05/2016 04:31 PM, Christian Corti wrote:
On Tue, 5 Apr 2016, Pontus Pihlgren wrote:
http://www.retrocomputing.net/
Looks like he has both an 11/780 (though it looks to be in pieces)
and a 390.
Impressive collection.
... that get's much smaller if you omit all those entries for flat
Hi. I am searching for a long time a similar set of 5.25 diskettes for my
3B1. If someone could provide me a copy it would be great.
Kind Regards
Sergio
2016-04-06 6:45 GMT+02:00 Jerry Kemp :
> Thank you again for all the updates, and all the work you have done on the
> 3B2 project.
>
> I can't
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