test-drb

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101090 discussions

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

15 years, 6 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

15 years, 6 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

15 years, 6 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

15 years, 6 months

MacOS 7.x problem

by snhirsch＠gmail.com

I was given a ZIP file that unpacks to two directories under MacOSX: Diagnostic1 MacUser All files are in pre-OSX "forked" format. I copied both resulting subtrees to a netatalk server and tried to access them from a 68k mac. For some reason, the second of these is visible under MacOS 7.x (tried several values of 'x')! The MacUser directory is fine - both data and resource forks are as expected. However, no matter what I've tried 'Diagnostic1' simply does not show up in the finder. I'm sure it's something basic, but I'm not much of an ancient Mac guru. Any ideas? Steve --

15 years, 6 months

1970s TTL specs and prices

by thomas.gardner＠sbcglobal.net

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? I must be getting old because I remember the 7474 well but I thru out my Yellow books years ago :-) Thanks Tom

15 years, 6 months

TRS-80 Model II Haul in York PA

by classiccmp＠vintage-computer.com

I was contacted many months ago by folks in York PA about a large TRS-80 Model II collection they need to get rid of. This includes several CPUs, hard drives, software, manuals and so on. Someone was supposed to collect this but has failed to do so and now the gear is in jeopardy of being scrapped VERY soon. If you can save all or part of this haul please contact me ASAP so I can put you in touch with the owner. This stuff should have been gone by the beginning of last month so time is critical to save it. -- Erik Klein www.vintage-computer.com www.vintage-computer.com/vcforum - The Vintage Computer Forums marketplace.vintage-computer.com - The Vintage Computer and Gaming Marketplace

15 years, 6 months

SCSI to IDE/SD community project

by lynchaj＠yahoo.com

Hi! I made this offer at Vintage-Computer.com forums and got some response so am also making the same offer on CCTALK. The following link is the design I referring to: http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=SCSI2IDE I am trying to decide what to do with the SCSI to IDE/SD project. I think it would be a good and helpful thing to have but recognize it may be too specific or overcome by events. If you are interested in buying a prototype board please contact me at mailto:LYNCHAJ at YAHOO.COM?subject=SCSI2IDE If there are 5 people interested I can get a batch of five PCBs made for $150 or $30 each. If there are 10 I think I can get the prototype board cost reduced to around $20 each. Please note if you buy a prototype board you don't have to actually build and test it. You can buy a board and have it sent to a volunteer builder for build and test. If the SCSI2IDE project is to succeed we have to get past the prototype board phase and into the hands of builders for coding. Obviously with prototype boards there are no assurances and you can expect there will be problems. We have to find those and fix them before a manufactured PCB is even a possibility. Thanks and have a nice day! Andrew Lynch

15 years, 6 months

SCSI on the small and cheap

by jws＠jwsss.com

Does anyone have experience or notes on the absolute minimum hardware to do parallel narrow (and slow) SCSI. Back in the early days, we were doing non arbitrated buses, and they are now essentially unsupported, and there are some more bits related to Attention that possibly has to be responded to quickly to keep from upsetting initiator stacks. However I would think a small circuit external to a small processor such as a PIC or AVR would allow one to fool most initiators, and do a simple device with SCSI on one side, and either ethernet or USB on the other, or even an SD ram part. The reset signal has some real constraints about getting the drivers off the bus really quickly, and that is one signal that can't be handled in software unless you have really fast response. Also there are some state transitions related to Reset that I think might have some issues. You would of course need to latch that a reset occurred and when your slow device got around to polling it it could handle that. Also when the states are decoded would not be too hard to record and latch. I just wonder if this would be less than the simple target circuits out there and would be very difficult to implement. The messaging and selection added some logic I have not studied in a long time such that there were some transitions that could not be easily handled either. Jim

15 years, 6 months

HP 87 Keyboard parts (plungers)...

by clay＠ArcherServices.com

I recently acquired an HP 87 that I was able to repair, all except for a few sticking keys. From digging through the archives at this site and the HP-80 Series sites it seems the only way people have found to fix these is to cannibalize the plungers from other similar keyboards. Has anyone figured out a way to repair these cracked key plungers yet? I have tried a few things like gluing and wrapping and melting, etc, with little success. Does anyone know a source for these plungers? The HP part number 1535-4043 still comes up on HP parts site with no stock. Clay

15 years, 6 months

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