The felt pad that presses the floppy disk into the r/w head fell off my
RX01 (or whatever dual floppy drive is actually inside a DECmate model
III (a late edition of 6120-based PDP-8).
Has anyone tried to do that repair? What did you use for replacement,
self-adhesive felt material?
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. Re: 5" floppy?. (Jules Richardson)
2. Re: 5" floppy?. (Sridhar Ayengar)
3. Re: 5" floppy?. (Sridhar Ayengar)
4. HP3000 (Mike Loewen)
5. Re: HP3000 (William Donzelli)
6. Re: HP3000 (Mark Davidson)
7. Re: HP3000 (William Donzelli)
8. Re: Help with Shugart SA801 8" floppy with 230v 50 cycle
(feldman.r at
comcast.net)
9. Re: 5" floppy?. (David Griffith)
10. Re: 5" floppy?. (William Donzelli)
11. Screwheads; was 5 floppy?. (Chuck Guzis)
12. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle
(dwight elvey)
13. Re: 5" floppy?. (Dave McGuire)
14. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle
(Chuck Guzis)
15. RE: 5" floppy?. (dwight elvey)
16. Re:Screwheads, was: 5" floppy?. (Chuck Guzis)
17. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?)
(micheladam at theedge.ca)
18. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?)
(Gordon JC Pearce MM3YEQ)
19. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?)
(Lance Lyon)
20. IDE <-> MFM, was > Re: AT&T 7300/3B1's (was: Re: Who is
vintagecomputermuseum?) (emu at
e-bbes.com)
21. Re: The Day the Infant Internet Uttered its First Words
(Steve Maddison)
22. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle
motor... (ROBO5.8)
23. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?)
(Jules Richardson)
24. Re: Help with Shugart SA801 8" floppy with 230v 50 cycle
motor... (Jules Richardson)
25. Mystery paper tape reader (Tobias Russell)
26. MITS Disk Boot Loader manual (Richard A. Cini)
----------------------------------------------------------------------
Message: 1
Date: Tue, 25 Nov 2008 17:25:48 -0600
From: Jules Richardson <jules.richardson99 at gmail.com>
Subject: Re: 5" floppy?.
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <492C897C.1080407 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Fred Cisin wrote:
It sure is easy to slip into off-topic mechanical
griping.
Yeah, funny how there's a lot of interest overlap between vintage computing,
old cars, and engineering (and that it says in the "to" field of this message
that the list is for "General Discussion: On-Topic and Off-Topic Posts") - but
let's not go there, huh? ;-)
J.
------------------------------
Message: 2
Date: Tue, 25 Nov 2008 19:04:06 -0500
From: Sridhar Ayengar <ploopster at gmail.com>
Subject: Re: 5" floppy?.
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <492C9276.8000809 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Tony Duell wrote:
Even
computer companies - people that should know better, make
mistakes when talking about floppy disks. Last week I was in a Staples
store (American office supply store chain), and saw a Memorex 3 1/2" USB
floppy drive, the package stating clearly that it supported "1.44mb
double sided and 720k single sided diskettes". >
Well, calling it mb (millibyte) is clearly wrong. And the value of
1.44Mbytes assumes you take 1Mbyte as 1000*1024 bytes, which is downright
crazy.
Actually, doesn't mb imply "millibit", and mB is "millibyte",
with Mb as
"megabit" and MB as "megabyte"?
Peace... Sridhar
------------------------------
Message: 3
Date: Tue, 25 Nov 2008 19:06:26 -0500
From: Sridhar Ayengar <ploopster at gmail.com>
Subject: Re: 5" floppy?.
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <492C9302.40404 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gordon JC Pearce MM3YEQ wrote:
(once again, sorry Jay)
My favourite has to be Torx. I have never had any
problems with those.
Oh I have... <grumble>Bloody Volkswagens with their stupid 5-lobed
Torx-like brake caliper bolts, that you can't even get drivers for from
VW without ordering them from Germany...
My Audi uses triple-square for that kind of stuff.
Peace... Sridhar
------------------------------
Message: 4
Date: Tue, 25 Nov 2008 20:01:42 -0500 (EST)
From: Mike Loewen <mloewen at cpumagic.scol.pa.us>
Subject: HP3000
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <Pine.LNX.4.64.0811251950490.22596 at cpumagic.scol.pa.us>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Where have all the HP3000 systems gone?
Between 1986 and 1988, I worked on a whole slew of HP3000s, from the
Series III to the Series 70. They were popular in the business
environment, especially in COBOL shops. Where did they end up? You can
find loads of DEC equipment on Ebay, even IBM System 34, 36 and AS/400s,
the occasional HP1000, but the only HP3000 I recall seeing in recent years
was a single Model 37.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology
http://sturgeon.css.psu.edu/~mloewen/Oldtech/
------------------------------
Message: 5
Date: Tue, 25 Nov 2008 20:16:45 -0500
From: "William Donzelli" <wdonzelli at gmail.com>
Subject: Re: HP3000
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID:
<e1d20d630811251716q468c96f4s9ab6b8a98cecdd43 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Between 1986 and 1988, I worked on a whole
slew of HP3000s, from the
Series III to the Series 70. They were popular in the business environment,
especially in COBOL shops. Where did they end up? You can find loads of
DEC equipment on Ebay, even IBM System 34, 36 and AS/400s, the occasional
HP1000, but the only HP3000 I recall seeing in recent years was a single
Model 37.
You answered your own question.
DEC made loads of minis (PDP and VAX).
IBM made loads of minis (S/34 and S/36).
IBM made extra sized loads of AS/400 minis (more than any other minicomputer).
HP did not make loads of 3000s.
I think it is a simple population thing.
--
Will
------------------------------
Message: 6
Date: Tue, 25 Nov 2008 17:27:42 -0800
From: "Mark Davidson" <mdavidson1963 at gmail.com>
Subject: Re: HP3000
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID:
<d17c35610811251727u5ec8860ayd6474c43da58e5f3 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Tue, Nov 25, 2008 at 5:16 PM, William Donzelli <wdonzelli at gmail.com> wrote:
Between 1986 and 1988, I worked on a whole slew of HP3000s, from the
Series III to the Series 70. They were popular in the business environment,
especially in COBOL shops. Where did they end up? You can find loads of
DEC equipment on Ebay, even IBM System 34, 36 and AS/400s, the occasional
HP1000, but the only HP3000 I recall seeing in recent years was a single
Model 37.
You answered your own question.
DEC made loads of minis (PDP and VAX).
IBM made loads of minis (S/34 and S/36).
IBM made extra sized loads of AS/400 minis (more than any other minicomputer).
HP did not make loads of 3000s.
I think it is a simple population thing.
--
Will
I subscribe to the 3000 mailing list, and there seems to be one other
complaint... licensing the OS. I am no expert on the matter, but I've
gotten the impression that HP can be a real bear to deal with when it
comes to licensing the OS for users. It simply can get too expensive
for a hobbyist to run MPE...
Trust me, I'd love to have a small 3000 at home and if one ever shows
up, I'll snap it up if I can. They just seem to be pretty rare on the
used market.
Mark
------------------------------
Message: 7
Date: Tue, 25 Nov 2008 20:52:06 -0500
From: "William Donzelli" <wdonzelli at gmail.com>
Subject: Re: HP3000
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID:
<e1d20d630811251752r7c21a151ge4ceec709310254c at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I subscribe to the 3000 mailing list, and there
seems to be one other
complaint... licensing the OS. I am no expert on the matter, but I've
gotten the impression that HP can be a real bear to deal with when it
comes to licensing the OS for users. It simply can get too expensive
for a hobbyist to run MPE...
A complaint, yes, but really has nothing to do with why 3000s are so
scarce. Really, it is hard to beat the IBM AS/400 group for being
disagreeable when it comes to licenses.
I think DEC spoiled us.
--
Will
------------------------------
Message: 8
Date: Wed, 26 Nov 2008 02:41:19 +0000
From: feldman.r at
comcast.net
Subject: Re: Help with Shugart SA801 8" floppy with 230v 50 cycle
To: cctalk at
classiccmp.org
Message-ID:
<112620080241.25527.492CB74F00042AA6000063B722007621949DD2020E030B040A00 at
comcast.net>
Content-Type: text/plain
For small pulleys, check out a hobby shop that deals in radio controlled model airplanes
and cars. For small gears, try
www.nwsl.com. They also have small drills, bolts, and metal
rods (e.g., 1.5mm x 6"). In England, try
http://www.ultrascale.co.uk/ for small
gears.
Bob
------------------------------
Message: 9
Date: Tue, 25 Nov 2008 18:45:30 -0800 (PST)
From: David Griffith <dgriffi at cs.csubak.edu>
Subject: Re: 5" floppy?.
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <Pine.GSO.4.55.0811251843380.22711 at helios.cs.csubak.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Tue, 25 Nov 2008, Chuck Guzis wrote:
I once read an interview with the son of inventor
Henry Phillips (an
Oregon native) and he maintained that it wasn't the original design
(US Patent 2046343) that was at fault, it was primarily the fault of
ASC for cheapening the manufacturing process by relaxing
specifications--and the propagation of inferior tools. Indeed, the
screwdrivers I have that are labeled "Genuine Phillips" do seem to be
quite a bit better than the generic variety. One aspect of the
Phillips head not shared by Torx or Robertson/square is that it will
automatically center the driving bit.
I don't follow on the automatic centering. Yes, a slotted screwdriver can
slide out, but torx or robertsons?
The "slipping out", I believe is
referred to as "camming out".
While rebuilding a deck this summer, I found that even square-drive
screws are easy to strip when power is used to drive them.
That's why you're supposed to use a drill with a slipper clutch.
Fortunately, deck screws are being manufactured
with the Torx head
(mine were T25s) and allow for much better driving performance.