Hi,
FWIW, the best docs I've ever run across are the old Interdata/Perkin-Elmer
manuals for my 7/32's, 3203's, 3205, and 3210's... the 7/32 manuals even
include a complete listing of the microcode! All of the test program source
code is included in the test docs, and I have the source code for the OS
also.
Will J
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>When they say "do not lubricate ..." they're not lying!
If only the previous owners/techs had understood this!
> The grit and grime
>that finds its way into the leadscrew will act as lapping compound and
>abrade the lead screw, which in most of the newer lead-screw-driven
>mechanisms is plastic, and soon, you'll have a drive with too much backlash
>on the lead screw, which will result in positioning error, depending on the
>direction in which the lead screw was last moved.
I've got 14 Shugart 800's and 801's from this latest pile now undergoing
the DSD Hyperdiagnostics simultaneously (lots of head kerklunking!)
and I see no evidence of alignment problems on any of them. I'm strongly
of the opinion that 95% of alignment problems are created when folks go
in and fool with the alignment when there's nothing wrong in the first
place.
> I would probably feel
>comfortable cleaning out the gunk with a penetrating oil wuch as what you
>mentioned, but I would vigorously pursue the problem of getting the rest of
>the sticky residue out with a volatile solvent.
I think "Liquid Wrench" is both a penetrating oil and a mix of volatile
solvents. And in spraying it in I added my own oil to the lubricating
mess that shouldn't be there, but now at least I can turn the leadscrew and
run the drives through their paces.
>That, in turn, threatens to soften the plastic head-assembly, part of which
>is the "nut" for the lead screw, so don't get any of the benzene or methyl
>alcohol, or acetone, on the plastic parts, lest they soften and change their
>shape.
I appreciate that, I learned long ago to test chemicals against plastics when
a can of TV tuner I had dissolved the plastic shaft in an old TV...
>I'd suggest that you look at the service manual and consider whether this
>bothers you enough to warrant going through the painstaking process of
>disassembling and cleaning the head transports in order to get rid of the
>grease. If you're careful, you might find a way to brush out the threads,
>but they'll continue to accumulate dirt and grit so long as you have grease
>on the "nut" which is part of the head assembly.
Yes, I can do a halfway decent job with skewers and Q-tips to get the goo
out of the threads, but there certainly is some still left in the threads
on the head assembly/pre-load nut and that I can't get at without
removing the whole assembly and destroying the (currently fine) alignment.
Tim.
From: Lawrence LeMay <lemay(a)cs.umn.edu>
>Does anyone know if a Shugart 800-2 8" floppy drive is DSDD or not? I have
>been getting different hints on various web pages.
Definatley single sided, though it can run single or double density. I'm
very certain as I have a few 800s and 801s. The twosided versions are the
851
and 855.
Allison
Sorry for the partially off-topic question, but I'm stumped.
I'd like to set up more of my systems in a home network environment, but I
don't really properly understand routing and am looking for some help.
My internet access is through a cable modem that acts as a DHCP server,
allocating up to three IP addresses to specifically-named systems. For
instance systems "foo1", "foo2" and "foo3" will get IP addresses from the
modem, while "foo4", "foo5" and "foo6" will not.
I thought about snagging a small PC with a couple of NICs and running
ShareTheNet or WinGate, but I recently picked up a used Alpha running NT
with a pair of NICs that I'd like to try out as a router. Right now, the
Alpha has one of the magic system names (foo1), so one of the network
adapters gets a DHCP-served IP address. I have the other adapter's IP
address defined as 192.168.0.101, with the mask as 255.255.255.0 and no
gateway defined.
I want to set the following systems up with static IP addresses:
192.168.0.105 SGI Indy
192.168.0.106 Symbolics Lisp Machine
192.168.0.107 NeXT Cube
192.168.0.108 Pentium II Laptop
192.168.0.109 Pentium Desktop
192.168.0.110 DEC Shark
192.168.0.111 iOpener
I'd like to set up these machines to use 192.168.0.102 as their gateway.
Seems to me that if I have the Alpha set up properly, I shouldn't need to do
any special route definitions on the other systems, right?
So, any suggestions on how I should set up the two NICs on the Alpha under
NT 4.0?
-- Tony
I'm having a problem with my 7900 I'm trying to get up and running that I
wanted to bounce off the folks here.
When you hit the load switch, after spinup the heads seek cylinder 0 and
rest there (and an interrupt is sent to the cpu). However, any command sent
to the drive via diagnostics causes the heads to slowly step out one
cylinder at a time to the innermost track. Then the cpu gets a "no command
flag" message which basically means the cpu never got acknowledgement back
>from the drive that the previous operation completed.
This makes me suspect the encoder mechanism. The drive uses an IR
emitter/detector through a glass reticule with sector markings on it. But if
the encoder was shot, wouldn't that make it hard for the drive to initially
seek cylinder 0 upon loading as it does correctly?
Just curious... more of a philosophical question than a need for
direction...
Thanks in advance!
Jay West
>
> Documentation is the first component tossed by the wayside
> when deadlines are approaching too quickly.
>
> - John
Actually, the first thing that gets tossed is the development "process".
As a Quality Assurance Engineer, this is an issue that I have to deal with
*every* single day. Frankly, I don't expect it to get any better. :-(
If anyone cares to continue the discussion, I'll be glad to elaborate...
Steve Robertson
<steverob(a)hotoffice.com>
Does anyone know if a Shugart 800-2 8" floppy drive is DSDD or not? I have
been getting different hints on various web pages.
Also, does anyone recall the URL to the web site with the Terak and Shugart
manuals that have been scanned in?
-Lawrence LeMay
--- Doug Salot <doug(a)blinkenlights.com> wrote:
> On Thu, 13 Apr 2000, John Honniball wrote:
>
> > > But wait, there's more! I don't have pics yet, but for your salivating
> > > pleasure.... a 1966 DEC logic trainer...
>
> Hmm, could you be bribed to scan or copy the thing before it crumbles into
> oblivion? BTW, friend Eric has a later (1969) manual for a different DEC
> trainer:
> http://www.brouhaha.com/~eric/retrocomputing/dec/computer_lab/
I have an 8"x11" workbook for a TTL-version of the DEC Logic trainer. I got
it as a kid, so many of the pages are scribbled up with my attempts to solve
the problems. I regret that now, but at the time, the book was free to me
and photocopies cost money. Maybe I'll scan it (in my copious spare time) and
edit out the additions with Photoshop. I would leave them in, but they are
very poorly hand-drawn. I was between 9 and 13 when I got the book. I did
not use a drawing template.
I never have seen any of DEC's logic trainers close up. 20 years ago, I wanted
one lots. I still want one, but realistically, what would I do with it?
-ethan
=====
Even though my old e-mail address is no longer going to
vanish, please note my new public address: erd(a)iname.com
The original webpage address is still going away. The
permanent home is: http://penguincentral.com/
See http://ohio.voyager.net/ for details.
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I've just made my uVAX II accessable and opened it up to check what's inside
and would like some comments on what it contains.
I want to connect it by network or serial cable
to my network or a PC. It Should have bootable software installed.
These are the things I know but if any of you would like to elaborate feel
welcome
BA123 Box containing:
CPU M7606 with propably 1 MB RAM
(Onboard RAM=disconnected if other RAM is
present ?)
RAM M7609 2x (Do they have standard amount)
they are fully stucked with chips
M7516 DEQLA or DEQNA ?
(Has cable going to the AUI connector at the back)
M7555 Diskcontroller ? dunno type of controller
but it connects to 2 * RD54a
(via an intermediate board and cables)
M7546 Tapecontroller for TK50
Unkown ID.
Board from Distributed Logic Corp with the following numbers:
SQ703A , 706AQ0748 and on the rom: 45u / 92782 Rev j.
It is connected to an EXABYTE 8200SX 8mm Tapedrive so
it shoul be a SCSI-controller. The guy i got the uVAX from told me
that I could change it to a SCSI-controller the could access SCSI-HD's
rather than a EXABYTE tapedrive. But I should change some prom's
on the card.
TK50 1x
EXABYTE 8200SX 1x
RD54A 2x
Furthermore I would like to know how to connect a PC-terminal-emulator to
the terminal
connector at the back. It is a 9 pin D-type connector and a Baudrate switch
next to it.
Does it have a standard PC-like pinout? Do I connect with null-modem
configuration ?
Sipke de Wal
I am looking for a source for the 600 Mbyte magneto optical
5 1/4" cartridges with 512 byte per sector. These will be
used in a SONY SMO S-501 5 1/4" magneto optical disk drive.
I have also found a SONY SMO S-501 drive, but I would like to
acquire a second one (or a compatible) as a backup.
Sincerely yours,
Jerome Fine
