Jules,
have a look at the biggest database for harddisk drives: www.pc-disk.de
All you have to do is to click on "producer", then on the left, you can navigate down to the Seagate drives.
For the ST1480N, there is the layout of the PCB and the jumper definitions where the termination power is
pointed out as well.
Regards,
Pierre
>
>
> Does anyone happen to have a reference for the termpwr jumpers on a Seagate
> ST1480N 425MB SCSI disk?
>
> The only online reference I've found so far is set out to use the old DOS font
> with line drawing characters in it, and nothing I've been able to find in
> Firefox (or elsewhere in Linux) has been able to display it properly :-(
>
> I know the termpwr jumpers are 7 and 8 down the left side of the drive, but
> deciphering the characters used in the corresponding truth table is proving
> tricky.
>
> (I've having another look at the NeXT Cube; I assume that the drive is
> currently expecting termpwr from the bus, but the NeXT isn't supplying it)
>
>
> ta
>
> J.
>
_______________________________________________________________________
Jetzt neu! Sch?tzen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate
kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220
Speaking of old telephony switches...my building seems to have been once a
telephone relay substation. If anyone is really interested in having this
stuff, let me know privately and I can take pictures, etc. There are a lot
of old component cards, wires, wall boxes, etc. "Western Electric" etc. in
the basement. I do not know much about this stuff. Looks like it was last
upgraded in the mid 70's. Location - Wilmington, Delaware USA
Bill
My experience is
SDS9300 - 24bit
Elliott 803B - 39bit - one restored and working at Bletchley Park
Digital PDP-7 - 18 bit
Digital PDP11-45
LEO 326 - ? bits can't remember
> Message: 12
> Date: Thu, 28 Jun 2007 12:01:16 +0100
> From: Roger Holmes <roger.holmes at microspot.co.uk>
> Its got Ampex
> TM4 mag tape drives (not industry standard 7 or 9 track, these are
> ten track units with hubs the same design as professional audio tapes
> and the 2 and 3 inch wide video tapes once used by TV broadcasters).
Our SDS9300 had TM4 drives but I don't remember them being 2 and 3 inch
wide, I thought they were 0.5 inch, but then that was 35years ago. The
Elliott 803B had 35mm tape drives, sprocket driven, derived from film
handlers, tape made by Kodak.
Mike Hatch
Looking for a PDP-7 (some hope!)
----- Original Message -----
From: <cctalk-request at classiccmp.org>
To: <cctalk at classiccmp.org>
> Not enough UK list members, I suspect. I don't know where they all are...
> not
> on uk.comp.vintage, that's for sure. Maybe there are just more
> vendor-specific
> mailing lists for the UK scene [1] than there are for the US or something.
>
Newbie here Uk based.
> A big Venn diagram with DEC in the middle? ;-)
>
I'd go for that
Mike Hatch
Looking for a PDP-7 (some hope!)
My experience is
SDS9300 - 24bit
Elliott 803B - 39bit - one restored and working at Bletchley Park
Digital PDP-7 - 18 bit
Digital PDP11-45 -
LEO 326 - ? bits can't remember
> Message: 12
> Date: Thu, 28 Jun 2007 12:01:16 +0100
> From: Roger Holmes <roger.holmes at microspot.co.uk>
> Its got Ampex
> TM4 mag tape drives (not industry standard 7 or 9 track, these are
> ten track units with hubs the same design as professional audio tapes
> and the 2 and 3 inch wide video tapes once used by TV broadcasters).
Our SDS9300 had TM4 drives but I don't remember them being 2 and 3 inch
wide, I thought they were 0.5 inch, but then that was 35years ago. The
Elliott 803B had 35mm tape drives, sprocket driven, derived from film
handlers, tape made by Kodak.
Mike Hatch
Looking for a PDP-7 (some hope!)
------------------Original Message(s):
Date: Thu, 28 Jun 2007 15:52:56 -0700
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: Billy Pettit real disappointment
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <4683D958.2968.16663E7 at cclist.sydex.com>
Content-Type: text/plain; charset=US-ASCII
On 28 Jun 2007 at 14:52, Jules Richardson wrote:
> Yet another oddity discovered today: it would seem that the rotating magnetic
> fixed-head disk in the Burroughs L-2000/3000/4000/5000 machines wasn't for
> secondary storage (as I'd assumed), it was the primary store in place of the
> core typically found in systems of the time. I bet there can't be many
> machines around which had rotating store as the primary memory.
Not at all uncommon during the 1950's. (e.g. LGP-30)
In fact, the Univac SS-80 that I mentioned not only has a drum as
main memory, but it's synchronized to the card reader. There were
two machines in the Univac "Solid State" series; the SS-80 for
conventional 80-column Hollerith cards and the SS-90 for Univac 90-
column cards. The layout on the drum was different for each.
The "solid state" refers not to transistors (which were used mostly
to drive indicator lamps), but rather to the magnetic cores used not
for memory, but for logical operations; one clock cycle per core.
The master clock was driven with 6 4X150 power tetrodes.
Very unusual--and very reliable for its day.
Cheers,
Chuck
-----------------Reply:
Nevertheless unusual for a machine in the L's size and price point;
these were essentially desk-sized accounting computers (posting
machines) used in banks and numerous small offices. The sealed
fixed-head disks were indeed very reliable; secondary storage
(when there was any, other than hard copy ledger cards) was on
PPT, EPC and on some models mag stripe cards and up to 4
digital cassette drives.
Later models (L6000 onwards) used 2102 RAMs ($800/2K).
BTW, the L's predecessor (E series) did use core memory and a
device called a core counter, a special core that emitted a pulse
for every 10th pulse in.
And to link this to another thread, I believe I still have a copy of
Lunar Lander for the L series; no display of any kind, just a
Selectric type golf ball printer. And speaking of golf balls, there
was also a golf game for them, as well as lots of ASCII art.
Here's hoping that one of the few people who have one of these
(other than Bletchley) will manage to get one going one of these
days...
mike
Not my first modem (that would have been the Vicmodem on the CBM Vic
20,) but probably the oldest one I put to actual use was an
Andersen-Jacobson 300 baud model. It has disappeared into the maze of
junk in my basement so I don't have the full spec on it. But it was
direct connect, had heavy-duty toggles on the front and a classy
woodgrain veneer on the top and sides :)
Believe it or not I used it from about 1993-1995, in the leaner days
when a lot of my gear came from the dumpster at the local community
college.
-----------------Original Message:
Date: Sat, 23 Jun 2007 13:50:40 -0400 (EDT)
From: der Mouse <mouse at Rodents.Montreal.QC.CA>
Subject: Re: What are the really unusual or weird computers?
> It is too bad Windows and the PC group didn't continue the
> OpenFirmware concept. [...] It was a bad move that has cost
> millions if not billions of dollars worth of lost productive time.
I think having an OS that crashes weekly - daily, or worse, in many
cases - and needs a complete ground-up reinstall at least annually has
cost their customers far more.
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
------------------Reply:
I usually ignore the MS- and WIN-bashing that is apparently a basic
requirement for anyone wishing to be taken seriously in the computing
field, but just for the record:
My main system has been running Win98SE more or less 24/7 since it
was released and although the hardware has been upgraded several
times it has never had a ground-up reinstall (although I will do one
Real Soon Now). Yes, although a BSOD is a very rare event, it does
misbehave occasionally but that's not surprising considering all the
obscure software that has been installed on it over the years. I have
never lost any data (except as a result of my own carelessness) and
except for a couple of virus incidents all that's required when it does
misbehave is a reboot while I get a cup of coffee.
My clients' systems with much more stable software environments
are even more reliable and any problems are almost always hardware
or operator related; even monthly crashes would not be tolerated for
long.
If your system crashes daily or even weekly, I'd recommend that you
find a qualified computer professional to fix it for you...
mike
>
>Subject: Re: What are the really unusual or weird computers?
> From: "Liam Proven" <lproven at gmail.com>
> Date: Tue, 26 Jun 2007 16:36:50 +0100
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 25/06/07, Chuck Guzis <cclist at sydex.com> wrote:
>> On 25 Jun 2007 at 18:14, Liam Proven wrote:
>>
>> > I am a biker myself - pedal and motorcycles both - and don't know much
>> > about cars, but I don't believe I've ever seen a car with a starter
>> > button. Maybe in a museum.
>>
>> Liam, you must not be old enough. Most cars made before 1951 or so
>> had one--I clearly recall the one on my aunt's 1950 Hudson.
My brother had a '69 baracuda when a few performance mods that the ignition lock
was only to "enable" it and the button for the starter was under the dash
where a foot could do it. Securtity by obscurity.
>But American cars are /weird/ compared to the rest of the world. (I
>live in Europe and have travelled extensively there, grew up in Africa
>and have visited Asia as well as N America.)
Really! I had a Saab that had a three cylinder engine that burnt
two cycle mix (oil in gas) like an old outboard. If that wasn't
weird enough starting was turn on ignition, set choke and pull cord.
Yes it had a pull cord to start it no electric starter.
>Automatic transmission seems ubiquitous, which AFAICT is pretty much
>unique to N America, /but/ most people still drive these huge,
>tank-like petrol-guzzling monsters, whereas the rest of the world
>(that can afford new cars at all) prefers smaller, lighter, more
>efficient machines which cope better with traffic and produce less
>waste and environmental damage - though that's incidental to their
>owners for the large part, what matters is that they are cheaper.)
I drive a toyota small pickup 2.2liter engine (smallest) and dirt
cheap to feed and lots of room for racks! Great for gathering
system and all.
>It's too fiddly that way, but then, I mainly drive Windows with the
>keyboard anyway. And since I prefer and use 20yo IBM Model M
>keyboards, I don't have a Windows key, either - so it's Ctrl-Esc, up,
>return, return. :?)
I do that and people watching are amazed it's possible! Really
helpful when the mouse quits or worse isn't recognized for some
odd reason. I just wish someone would make a PC keyboard without
the numeric keypad at all, just slice it off to the right of the
cursor keys and get rid of four inches of wasted space.
Allison
>>Does the service manual contain schematics? If so, it should
>>be easy to find out which pins are used.
>
>I am scanning the schematics right now and will post them
>shortly. If somebody can take a look at them and decipher
>them for me, that would be GREATLY appreciated!
The interface has a 15 pin male adapter, with
8 pins on top and 7 on bottom.
I have added a link to the schematics at the bottom of
the HP7202A Plotter page on my web site.
Go to:
http://www.woffordwitch.com/HP7202A.asp
and click on the link at the bottom of the page.
Ashley
http://www.woffordwitch.com
