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101090 discussions

Wanted: DEC MSCP 19" rackmount hard drive

by pechter＠pechter.dyndns.org

> 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?

25 years, 11 months

Atari Computers

by MCONLIN＠danielind.com

I have a couple of Atari 800XL's new, in the box. Can anyone direct me to anyone that may be interested? Mike Conlin

25 years, 11 months

rescued a beehive!

by CordaAJ＠nswc.navy.mil

> -----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 > >

25 years, 11 months

PDP 8/L console

by ethan_dicks＠yahoo.com

--- 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. __________________________________________________ Do You Yahoo!? Send instant messages & get email alerts with Yahoo! Messenger. http://im.yahoo.com/

25 years, 11 months

More PDP-8/L teletype stuff

by ethan_dicks＠yahoo.com

--- 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/

25 years, 11 months

Warning: Most of DejaNews Archive Offline

by healyzh＠aracnet.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/ |

25 years, 11 months

exabyte tape unit

by pete＠dunnington.u-net.com

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

25 years, 11 months

Identification request - QuadexQ5000/SMS/Compugraphics/DEC ??? should I save it?

by west＠tseinc.com

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

25 years, 11 months

Mac IIcx video connection

by SUPRDAVE＠aol.com

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

25 years, 11 months

More PDP-8/L teletype stuff

by djg＠drs-esg.com

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

25 years, 11 months

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