test-drb December 2010

test-drb@ccmp.vtda.org

154 participants
208 discussions

by ethan.dicks＠gmail.com

Hi, All, I have had no luck googling any pictures of the short rack for the PDP-11V03 system (CPU + RX01 in a formica-topped office-friendly rack) that I *think* is called an H9610. For that matter, I was largely unsuccessful in finding pics of most DEC racks by rack part number (i.e., finding an 11/70 picture is easy - finding an H960 picture is not). Textual material for various rack configurations abound, but not pictures accessible by Google image search. If anyone knows of a gallery of rack pictures, I'd be grateful if you'd share the URL. Thanks, -ethan

13 years, 5 months

Parallel Dongles

by teoz＠neo.rr.com

Anybody know how to read an old parallel port dongle (Rainbow Tech Sentinel Pro) to find out what software/version it is for?

13 years, 5 months

1970s TTL specs

by thomas.gardner＠sbcglobal.net

> Subject: Re: 1970s TTL specs and prices > To: cctalk at classiccmp.org > Message-ID: <4D006B2A.5090407 at bitsavers.org> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 8/20/10 11:23 AM, Tom Gardner wrote: > > For some Computer History Museum work I need information on 7400 series > Flip > > Flops (S and Normal, DIPs) circa 1973 (anything 1970-75). Anyone have > any > > maximum clock speed and OEM volume pricing information on parts such as > 7473 > > thru 79 or 74106-116? > > > > At introduction (May 1966) The 7474 (25Mhz toggle freq) was $11.40, $9.10, > $7.70 > quantity 1/25/100, respectively > > The most expensive TI TTL part at that time was the 7491 9 bit shift > register at > $31.25, $24.85, $21.25 > > Their most expensive IC was the linear SN354A Demodulator/Chopper at > $145, $116, $99 > ------------------------------ There is a fairly complete set of IC Masters at the UC's Northern Reference Library Facility, Richmond CA, http://www.lib.berkeley.edu/NRLF/. They have a public reading room and will pre-pull material per an email request, nrlfreq at library.berkeley.edu. As it turns out I will be there next week doing some research on DRAM using all the IC Masters and can see what is in the 1973 version about various TTL. FWIW, I frequently use a learning (pricing) curve off a per 100 price to get a reasonable estimate of the high volume OEM price. You will have to justify the learning percentage (2% to 10%) and the OEM volume (multiple of annual volume of a high volume system?) to come up with a price. For example using the 1966 7474 at $7.70 with a 5% learning curve and a 100,000 OEM volume has an estimated OEM price of $4.60. You will have to do some research and thinking to come up with the values u use. Tom

13 years, 5 months

Wow! Lego Antikythera device -- and it works

by evan＠snarc.net

http://therawfeed.com/apple-engineer-re-creates-2000-year-old-greek

13 years, 5 months

Drive Type International Memories, Inc. (IMI) 5012H

by dm561＠torfree.net

Date: Mon, 06 Dec 2010 17:33:50 -0500 From: "Curt @ Atari Museum" <curt at atarimuseum.com> Subject: Re: Drive Type International Memories, Inc. (IMI) 5012H > Weren't IMI's used in much of the earlier Corvus drives too? Yes, in fact Corvus later acquired IMI AFAIK. Cromemco also exclusively used IMI drives with their WDI and WDI-II IMI controllers before they finally went to an ST-506 controller, both the large 7000 series and then the smaller 5000 series; note that the 5000s were available with either the 40-pin IMI interface or a standard ST-506 interface and the model numbers are not necessarily unique. mike

13 years, 5 months

Wow! Lego Antikythera device -- and it works

by feldman.r＠comcast.net

>Message: 26 >Date: Fri, 10 Dec 2010 00:27:09 -0600 >From: Doc Shipley < doc at vaxen.net > >Subject: Re: Wow! Lego Antikythera device -- and it works >Evan Koblentz wrote: >> http://therawfeed.com/apple-engineer-re-creates-2000-year-old-greek > >?? I thought the Antikythera Research Project decided a few years ago >that the original did NOT use differential gearing. > >?? To be perfectly honest, the fact that the Antikythera incorporates >the first known User Guide impresses me as much as the technology.... > >????????Doc > The report in The Register ( http://www.theregister.co.uk/2010/12/10/lego_computer/ ) includes some additional links, including one to an interesting article in Nature News from Nov. 24th at http://www.nature.com/news/2010/101124/full/468496a.html . Bob

13 years, 5 months

FFS: HP Memory Board D4262-60009 for LX Pro

by trag＠io.com

Anyone have a use for this? It is a memory expansion board of some kind >from a Netserver LX PRO. It has sixteen 72 pin SIMM slots. Not populated. HP D4262-60009 Free for cost of shipping from 78759 Jeff Walther

13 years, 5 months

Fwd: [GreenKeys] ATLANTIC RESEARCH DATA TECH DTS-1-M470/483

by jfoust＠threedee.com

Forwarded from the Greenkeys list. Looks like an interesting piece of test gear: http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=370462778137 - John From: "George B. Hutchison" <w7tty at olypen.com> To: "Don Robert House" <Packard42 at gmail.com>, <dhunter at islandregister.com> References: <4D001215.31954.3F92DD3 at dhunter.islandregister.com> <77B62C3F-03B0-47FD-8BC6-BFC1BF51B8DA at gmail.com> Date: Wed, 8 Dec 2010 22:14:21 -0800 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-osmtp-outbound-sender: w7tty at olypen.com X-osmtp-host: 65.243.191.51 X-osmtp-virus: clean Cc: greenkeys at mailman.qth.net Subject: Re: [GreenKeys] ATLANTIC RESEARCH DATA TECH DTS-1-M470/483 X-BeenThere: greenkeys at mailman.qth.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: "Discussion of older radio teletype $RTTY$ gear " <greenkeys.mailman.qth.net> List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/greenkeys>, <mailto:greenkeys-request at mailman.qth.net?subject=unsubscribe> List-Archive: <http://mailman.qth.net/pipermail/greenkeys> List-Post: <mailto:greenkeys at mailman.qth.net> List-Help: <mailto:greenkeys-request at mailman.qth.net?subject=help> List-Subscribe: <http://mailman.qth.net/mailman/listinfo/greenkeys>, <mailto:greenkeys-request at mailman.qth.net?subject=subscribe> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: greenkeys-bounces at mailman.qth.net Errors-To: greenkeys-bounces at mailman.qth.net X-Spam-Status: No, score=-2.6 X-Spam-Score: -25 X-Spam-Bar: -- X-Spam-Flag: NO That unit was one of the standard pieces of test equipment issued to all RCA Service Company Data Comm Techs. When RCA succumbed to GE, a lot of them just disappeared. I still have mine and it still works like a champ. If the manual didn't come with that one let me know and I'll haul my manual down to UPS and have it scanned into a .pdf. You can either use it as a loop keyer, or, if you need loop power, it will provide that as well. You can send distorted signals up to 44 per cent switched bias, and can measure incoming bias and distortion as well. I never left home without mine. There is a built-in FOX generator that will do baudot, ASCII, Teletypesetter, and EBCDIC. And you got a very good deal. A friend of mine traded a new, unfired .45 ACP Match Grade pistol for one, and both parties thought they got the better end of the deal. The Beer Cooler Accessory was extra, but otherwise they were a repairman's dream. W7TTY

13 years, 5 months

Fixing small plastic... things

by derschjo＠mail.msu.edu

Hi all -- Got myself a Friden 1162 desktop calculator. This is from about 1968-69 and has a neat-O keen CRT display and uses a magnetorestrictive delay line memory. Kinda cool. Mine has taken a fair amount of abuse over the years, and is currently not working properly -- at the moment it powers up (with nominal voltages, etc) and displays a normal display of all zeros, but as soon as a key is depressed, the screen goes blank and never returns. The 1162 has a rather interesting keyboard encoding mechanism (you can see a decent overview of the device & the keyboard mechanism here: http://www.oldcalculatormuseum.com/friden1162.html) Close investigation of the keyboard mechanism on my specimen reveals that a few of the plastic "fingers" that are positioned on the rods that move the magnets to/away from the reed switches have snapped off. I have a close up picture of what the fingers are supposed to look like at: http://yahozna.dyndns.org/scratch/friden/normal-finger.JPG And a picture of one of the broken ones at: http://yahozna.dyndns.org/scratch/friden/broken-finger.JPG The broken fingers no longer make contact with the mechanism, and so a couple of the reed switches do not get activated properly. I'm guessing that this is at least part of the reason the machine is acting the way that it is (that it's getting unexpected scancodes from the keyboard and going off into the weeds...) I need to figure out how to "recap" these fingers. I don't have a lot of experience repairing plastic stuff like this, anyone have any suggestions? Thanks! Josh

13 years, 5 months

Original HP Laserjet printer, free in Maryland...

by clay＠ArcherServices.com

I still have some parts for the original LaserJet. If I recall correctly, the engine was made by Canon and was also used in printers by other manufacturers like QMS and Canon. I installed & maintained quite a few of them. As far as collecting printers, I still have a few that are small enough to hold onto. I have a Kleinschmidt drum printer (1960's?) and an Axiohm aluminized-thermal printer from the late 70's. I had to give up all my Teletype's (ASR-33 and an older model) as well as a chain printer, Printronix line printer, and a wet-process "laser" printer from the early 70's (?) I think it was a Xerox. Just took up too much space. They are all a part of history; I hope someone out there is holding onto them. Clay --------------------------------------------------- Owned by a coworker of mine who says it still works fine. He doesn't want to throw it out if there is someone interested in preserving it. Somehow, I've never been interested in adding printers to my collection. In the "nostalgia era" of my computer experience, what I collect, printers were noisy, messy and not worth the bother. Anyway, if you want it and can arrange to pick it up fairly quickly, let me know. Bill

13 years, 5 months

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test-drb December 2010