> Johnny Billquist <bqt(a)update.uu.se> writes:
> > I just love the RP07 for finesse. Not that sure about reliability, but it
> > sure looks impressive enough, with that front panel, and everything... :-)
>
> I had an RP07 once. Wonderful drive - Memorex's answer to the IBM 3370/
> 3380. But the spindle drive belt failed and in the 2 days it took to get
> a new one, the heads stuck to the platters and that was the end of the
> drive...
>
> Terry Kennedy http://www.tmk.com
> terry(a)tmk.com Jersey City, NJ USA
The drive had a large number of problems early which led to its
being less than popular.
One was sticktion and a failure of the heads to retract on power fail.
The fix was a battery pack and adjustments to the HDA assembly. IIRC
The other was cost, maintenance difficulties (large heavy hda which
wasn't available in large quantities at DEC... which lead to maintenance
downtime.)
The RA81's seemed to undercut the device in price and took the market
>from it in sites with HSC's and even some UDS50's got jacked on to
11/70's.
I wonder what would've happened if DEC had an HSC-CI70 that interfaced
with the Cache or Massbus bus systems on the 11/70's.
Bill
--
bpechter(a)monmouth.com | Microsoft: Where do you want to go today?
| Linux: Where do you want to go tomorrow?
| BSD: Are you guys coming, or what?
> -----Original Message-----
> From: Frank McConnell [mailto:fmc@reanimators.org]
> Sent: Friday, May 19, 2000 4:13 PM
> To: classiccmp(a)classiccmp.org
> Subject: Re: rescued a beehive!
>
>
> allisonp(a)world.std.com wrote:
> > I know, I worked for Haziltine and was part of
> manufacturing engineering
> > for terminals then.
>
> Hmm. This might have been before your time, but I might as well ask:
> got any stories to tell about the Hazeltine 2000?
Back in the 70's when I was in college (WPI), our computer center used
a bunch of HZ2000s at the center itself. (our system at the time was a
KA based PDP-10). An oddity of the TOPS10 monitor (or at least the
version that we were running) was that it let people send messages
between terminals even if no one was logged in. One of my friends
figured out that if you opened an unassigned terminal in the computer
center (usually after hours)from a remote campus site, you could
dump a series of commands (usually including "send" commands :-) to
the HZ2000, terminated with a "send screen" command sequence.
This let you send messages that looked as if they originated from
the center to another remote terminal.(Heck, we were just college
kids, and it was an innocuous bug. Boy, I miss those days :-).
-al-
>
> I ran across a few of them in the early 1980s, being used as 1200 bps
> terminals to a Univac 1108. 74-column green-screens in yellow-painted
> metal boxes. Very funky, even then.
>
> -Frank McConnell
>
>
--- Lawrence LeMay <lemay(a)cs.umn.edu> wrote:
> Does anyone have that information on the W076?
I have the schematic in the PDP-8/L reference schematics. Isn't there a
copy of these on Highgate?
> I would want to connect a Teletype model 33 (assuming the one i'm
> supposed to be getting one of these days actually works...).
That'd be best, especially if you want to load software and don't have
a high-speed paper-tape reader.
> Also, I would like to be able to connect an IBM to the 8/L, and hopefully
> use it to download paper tape images (probably using a rs232/current-loop
> interface). Has anyone been using an IBM like this in place of a
> ASR terminal?
No, but you can buy/make 20mA-to-RS-232 adapters. Also, I have very
successfully used DEC VT220 on my -8/L - it already has a 20mA connector
on the back. My current arrangement is to use my high-speed reader for
loading and my VT220 for running diags, playing games, etc., to save on
TTY paper.
-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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--- David Gesswein <djg(a)drs-esg.com> wrote:
> Highgate only has 8/I schematics, similar (I haven't found a copy of the
> 8/L schematics yet). I did get a copy of the module location chart
> from Dave Mahoney which is on highgate.
I have a B-sized drawing set, "DEC-8/L-HR2A-D, PDP-8/L MAINTENANCE MANUAL
Volume II; 3rd printing - March 1972" I would have already scanned them,
but my flatbed is out on loan. I'll increase the priority of getting it
back and see about scanning it for Highgate. If anyone else has that document,
feel free to beat me to 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.
__________________________________________________
Do You Yahoo!?
Send instant messages & get email alerts with Yahoo! Messenger.
http://im.yahoo.com/
I'm depressed, I was just trying to lookup some info using DejaNews, and
couldn't get it to dredge up anything older than about a month ago. Now I
know why, they've taken the archives offline, and are apparently moving
thier servers to a new site. Between the 20th-26th the stuff from two
weeks to a year ago will be unavailable. The stuff older than that could
be offline for several months :^(
Don't know about everyone else, but DejaNews is one of the first places I
check when trying to solve a problem. I feel like I just had a lobotomy :^(
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)aracnet.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
On May 21, 23:25, Eric Smith wrote:
> On May 21, Gary Hildebrand wrote:
> > I have a quick question: I just procured an exabyte EXB8505ST and was
> > wondering if any of you knew what tape it uses and what the capacity is
> > in MB. Got this at a swap meet for the case, but if the drive is
> > useable, I'll keep it together.
>
> Native 5G (on 120 meter tapes?). More with compression. Uses 8mm data
> tapes.
112m, actually.
> Some 8mm video tapes (typically 112 meter?) have been known to
> work, but if you go that route, don't use cheap ones. It's rumored that
> Sony changed their 8mm tape formulation at some point to prevent their
> video tapes from working in Exabyte drives, since they wanted to sell
> higher-priced data-grade tapes.
>
> Personally, I use data grade tapes anyhow.
> And yes, I've personally verified that the error rates on DDS tapes from
> the major manufacturers are in fact lower than the error rates on the
same
> manufacturer's audio DAT tapes. Whether that's true of 8mm tapes as
well,
> I don't know, as I haven't done any comparisons.
When I got my Exabytes (8200's), I had a mix of video and data tapes. I've
never tested them properly, but it seems like the data tapes are indeed
better. Tip: buy a cleaning cartridge.
There's a whole lot of technical info (including the manuals, firmware
notes, upgrades) on ExaByte's support web pages:
http://www.exabyte.com/home/suppserv.html
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
A friend called me about a cpu cabinet sitting next to a dumpster. I would
like some background and identification on this system if anyone knows. And
most importantly - there's much more that I left behind - should I go get it
(as in anyone here want some of it)?
At first blush I didn't think it would be interesting, but it looks like an
unibus system; it also had some M8043 and M8017 cards in it so it must be
something DECish?
Here's very sketchy details...
Quadex Q5000 labeled rack and cpu enclosure
Various tags inside the cabinet mention Quadex or Scientific Micro Systems
or CompuGraphics
A very deep rackmount unit with a QIC tape slot in the front
A very deep rackmount unit with two 8" floppy drives - model A02028-501 "030
Storage Module"
The backplane looks DECish to me - similar to what I've seen in a 11/44.
Here's some of the cards that are in it.
Three M8017 - I know what these are :)
One M8043 - I know what this is too :)
Four boards #20033 - each has a tiny 4 pin connector and a tiny coax type
connector (much smaller than 10b2). Main chip is N8X305N
one #70201 which obviously went to external devices - two 50 pin headers
which end in same connector 11/23 uses to go to external RD52's
Sheild/bus terminator board - #203763
What appears to be a memory board and has a 40 pin connector on it - #75063
One board has a ton of different size ribbon cables coming off it - label
says "FWD0106"
Plessey Peripheral Systems board with 50-pin berg connector #703755
Small board #20041 with 14 pin berg coming off the side
2 card cpu set - #20038 and #20039, about 5 AM2901CPO chips, and a lot of
N82S191N chips that say things like "instruction decoder"
The SLU cards I can use in my 11/23's and 11/73's. I noticed that the back
of the cpu cabinet someone had labelled the ports - some said terminal and
some said "typesetter". Any idea what these cards are and if they're usable
in other dec systems? I left the QIC tape drive behind and they said there
was more where that rack came from - anyone interested or is this junk?
Trash pickup is on wednesday so let me know before then :)
Jay West
In a message dated 5/22/00 6:55:00 AM Eastern Daylight Time,
foxvideo(a)wincom.net writes:
> I have just been given the remains of a Mac IIcx, and would like to
> determine its condition without spending too much money. Does anyone know
> the pinouts of the 15 pin video connector?
>
> Thanks
>
> Charlie Fox
well, since the IIcx has no builtin video, the pinouts will depend on what
nubus video card you will use.
DB Young ICQ: 29427634
hurry, hurry, step right up! see the computers you used as a kid!
http://members.aol.com/suprdave/classiccmp/museum.htm
From: ard(a)p850ug1.demon.co.uk (Tony Duell)
Subject: Re: PDP-8/L teletype connection
> David Gesswein
>> It took me a while to remember where they stuck the schematic for the W076
>> but I found it. If you get the 8/I maintenance manual from
>> http://highgate.comm.sfu.ca/pdp8 volume I Figure 5-7 pg 5-16 shows the
>> schematic for the W076 and the connections to the teletype.
>> I see that the page was scribbled on, the numbers from top to bottom are
>> 4 6 3 relay- 7 relay+.
>Those numbers sound like the barrier strip terminal numbers for a (real)
>ASR33 that's been converted to full-duplex. Am I anywhere close?
That is in copper on the W076 board where the cable comes off the board
to connect to the teletype. It does look like that is the teletype
connection terminal numbers.
>Be careful if you're working on an ASR33, becase IIRC the first 2
>terminals (nearest the side of the case) of that barrier strip carry live
>mains (!).
Another of those design decisions which you wonder about.
>If necessary I can look up the ASR33 connections (I have the schematics
>somewhere) and tell you what the terminals are. But remember that the
>ASR33 transmit loop is non-polarised (it's a simple mechanical switch
>network so it doesn't matter which terminal is +ve) but most electronic
>current loop interfaces are polarised and you have to get the +ve and -ve
>leads the right way round. The ASR33 manual can't help with this.
>
The ASR33 manuals are also on highgate with the schematics in print set.
Those were a bunch of loose pages in several different sizes so I may of
not had all of them.
****From: Ethan Dicks <ethan_dicks(a)yahoo.com>
Subject: Re: PDP 8/L console
- --- Lawrence LeMay <lemay(a)cs.umn.edu> wrote:
> Does anyone have that information on the W076?
>I have the schematic in the PDP-8/L reference schematics. Isn't there a
>copy of these on Highgate?
>
Highgate only has 8/I schematics, similar (I haven't found a copy of the
8/L schematics yet). I did get a copy of the module location chart
>from Dave Mahoney which is on highgate.
David Gesswein
