I've located a 7980SR in excellent condition. I do recall my days of selling
HP that the S meant SCSI and the R meant refurbished. However, this one has
a tag stating it includes options -100 and -200. I do not have sufficient
memory to know what those options were, and I don't believe I have my HP
config/sales guides from that era :\
Does anyone know what options -100 and -200 are for the 7980S drives? If one
of them is 800bpi option, I'm gonna snag the thing! (otherwise I'll pass).
Jay
> Message: 1
> Date: Thu, 7 Jul 2005 12:11:20 -0500
> From: Ethan Dicks <ethan.dicks at gmail.com>
> Subject: Re: Time to change the Subject Line! Re: E-bay complaints
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Message-ID: <f4eb766f050707101117645204 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 7/7/05, Vintage Computer Festival <vcf at siconic.com> wrote:
>> On Thu, 7 Jul 2005, Ethan Dicks wrote:
>> > Isn't there a list member who... passed up an Apple I...
>>
>> That was me.
>
> Ow!
>
> -ethan
Still have mine!!
Even got my name in the index to the Apple I Replica
book...
Fred.
hatfield at bellsouth.net
Hi Bill
When I was helping a friend bring up a MDS800 system,
years ago, the only cheap drives we could find were
the ones for the 50Hz ( surplus ).
We just took a file to the motor spindle and ground
it down until is was the right speed. Do note that you
need to keep a little crown on the pulley to keep
the belt centered.
I do think that the belts are slightly different.
As I recall we also had to elongate the mounting holes
for the motor to keep the belt tight. It may be that the
flywheel pulley is slightly different to use the same
belt size but I'd think a different belt makes more sense.
We didn't have a 60Hz drive to compare to at the time.
Dwight
>From: "Bill Sudbrink" <wh.sudbrink at verizon.net>
>
>In the process of getting Dave Dunfield a door button for
>his Seimens 8 incher, I went through my whole stack of 8
>inch drives and parts. I "found" a couple of SA-851s that,
>while the serial number plate says they are 115 volt, 60 Hz,
>are in fact built with the 50Hz drive pulley. You can put
>them next to a "normal" SA-851 and see that the pulley is a
>different size and I just confirmed it by putting a diskette
>in one, powering it up, putting a scope on the index signal
>and seeing that (on 60 Hz power) it is turning at 432 RPM a
>20 percent increase over the 360 rpm it should be turning at.
>Other than that little problem, the drives seem to mostly
>function, that is, they seek, report track zero, etc. They
>appear to have seen very little use (probably because they
>don't fully work). Anyway, they weigh a ton (like most 8
>inch drives) but is there anyone within reasonable shipping
>charges of Washington, DC that could use them and would want
>to work out a trade? Alternatively, it just occurred to me
>that maybe I could just exchange pulley wheels with someone?
>
>Bill S.
>
>
Anyone have a later manual than mine, which only covers up to revision E
of the firmware? All the actual boards I have are revision F or G, and
it'd be nice to know if anything drastic changed in terms of
programming...
ta
Jules
>From: "Vintage Computer Festival" <vcf at siconic.com>
>
>On Thu, 7 Jul 2005, Dwight K. Elvey wrote:
>
>> I'm not sure how it works. The 10% number is not even
>> close. It is more like 0.5% or so. It does take up slack
>> over time. I think it has to do with the stretch of the
>> belt. There is more tention on one spool than the other,
>> making one side move a little faster than the other.
>> The one spool getting the more stretched belt would tend
>> to move a little faster than the side without stretch on
>> it since it would see more effective belt movement.
>
>I would think that the faster spindle has a smaller diameter than the
>slower one.
>
Hi
The belt drives over the surface of the tape so the
tape speed is independent of the spindle speed ( as Tony mentioned ).
The smaller spindle would revolve faster but that doesn't explain
how it maintains tension. As Tony said, the belt runs over
the surface of the tape at both spools. If every thing was
equal, the tape would never have any tension on it and any slack
would never be taken up. As one knows that has taken one
apart, the belt is a little elastic and is stretched on.
The place that the belt is stretched the most when moving
would need to have a higher surface speed ( kind of like
the Bernoulli principle ). This would cause that spool to
turn a little faster than it would if the belt were non-elastic.
Of course, the end of the belt that is close to the drive
would have the most tension and that spool should have
a tape speed slightly greater than the other spool until
the tension of the tape brought the other spool to the
same amount of stretch on the belt.
It seems like I remember something about holding some
tension on the tape when I was taking up the slack. As I
recall, it seemed counter intuitive at the time but thinking
about how the belt speed up the take-up spool, it makes
sense.
Joe, the next time you have to take up slack, maintain
a little tension on the feeding spool and you should notice
an increase in the rate that the take-up spool pulls the
slack in.
Dwight
Roy Carlson is the seller. I recently purchased a service device for
DASD, and Storage
Directors, which reads 8" floppies, which was much more in line with
collector prices.
The prices he is asking for the drek is in line with curio and display
junk listings, not
for vintage computer groups. That market will pay a lot just for punch
cards, and
such, just to frame and hang on the wall.
He has a nice set of Telex manuals at the end of the listing which I
hope maybe
Al Kossow gets for Bitsavers, as an example of how the vintage and old
computer
stuff he sells is.
He is just trying to clear out the end result of a repair and refurb
business, he is
as far as I know, not one of the gold scrap assassins, but is actually
very knowlegable
about the systems, etc.
I rated my transaction for the tester, and then before that for a 3420
test stunt box
to be excellent.
BTW, he has a lot of 3420 parts he hasn't listed and may be forced to
dump
if there are 3420 owners out there. Light bulbs and plastic tubing, and
cables
and belts don't sell well for curios, they look just about like the ones
on fans
and cars...
Jim
Gary Green wrote:
> At least if the items are overpriced, and the shipping is actual, or
> real
> close, you know what you're getting into before you bid.
>
> I've been looking for an older 1U rack-mount machine. I've found a
> number
> of units for a reasonable price, considering most of it is 6-8 years
> old.
> However, the shipping charges are about 2-3 times what they should
> be. So,
> I wait. :(
>
> >
> > http://search.ebay.com/_W0QQsassZredwooddr
> >
> >
> > The usual yada, yada, yada; no interest, no affiliation, etc...
>
> I bought my 9348 tape drive from him a few years ago. No big problem,
> though
> the picture in the listing was of another, less banged-up drive. It
> arrived,
> it works, and the shipping charge was only the actual Fedex cost - no
> "packaging and handling" markup that so many eBay sellers like to
> apply.
> However many of his current items do look severely overpriced to me.
>
> Tony H.
I know the base instruction set is right but I'm fairly sure the
IO structure is radically different, but --
What peripgherals and OS software is available for, or runs on,
the Intercept? (Not the Jr board, the rack-mount job).
I'm thinking it might make a comfortably modern old machine...
bit rushed on the first post, it seems.
1 ERGO (Tektronix X-terminal cable)
1 DECstation/VAXstation 3100/x SCSI -> Centronics 50
Of course, trades will be considered, but if not they are available for
shipping+a bit for bother. Seattle area.
Scott Quinn
>From: ard at p850ug1.demon.co.uk
>
>>
>> The really ingenous part is that the belt attempts to rotate the take up
>> spool about 10% faster then the other spool. That's what tightens up the
>> tape if it ever gets slack.
>
>How does that work? All points on the belt move with the same speed, the
>belt drives the outside of the 2 spools, so the surface speed of the
>spools must be the same. That's the tape speed. I don't see how it can
>move the tape faster on the takeup side.
>
>-tony
>
Hi
I'm not sure how it works. The 10% number is not even
close. It is more like 0.5% or so. It does take up slack
over time. I think it has to do with the stretch of the
belt. There is more tention on one spool than the other,
making one side move a little faster than the other.
The one spool getting the more stretched belt would tend
to move a little faster than the side without stretch on
it since it would see more effective belt movement.
Dwight
Yes, I still have Docs and software (BTOS?) for the B20 machine. I also
have the CPU and HD modules along with the monitor with at least one
power supply. The HD module died (it uses a Seagate ST-225 HD) when I
accidentally shorted something out. If the schematics are available
(preferably online), I would love to get a copy!
Al, I have a friend of mine coming down from Pleasanton on Saturday,
July 16, and I could give the stuff to him to bring up your way. IIRC,
there is probably between one and two bankers box full of docs and
software.
>> Alan Perry Wrote:
> Al Kossow Wrote:
> > I have a bunch of Burroughs B20 workstations
>
> Aren't these rebadged Convergent NGENs ?
>
> Marvin Johnson has a bunch of docs on these. I didn't realize how sophisticated the
> OS was on these, probably should see about getting the docs scanned, if he still has
> the stuff.
