test-drb August 2005

test-drb@ccmp.vtda.org

227 participants
528 discussions

by ajp166＠bellatlantic.net

This is aimed at whom? Allison > >Subject: Motorola 6800D2 > From: "Chuck Patten" <chuck.patten at verizon.net> > Date: Wed, 10 Aug 2005 22:05:00 -0700 > To: <cctalk at classiccmp.org> > >Noticed you had collected one from an old thread. Are you interested in >parting with it? > > > >cheers, > >chuck. > >

19 years, 4 months

Stan Veit's History of the Personal Computer

by tosteve＠yahoo.com

Hi, Is there a more interesting book on early computers? I doubt it. Who was it that was selling these here a while back? Send me a couple more copies please. Thanks! Steve. ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs

19 years, 4 months

volunteers wanted for list help :)

by jwest＠classiccmp.org

I'd like to solicit volunteers to help with gating posts from cctalk to cctech. Ideally, people in a drastically different time zone than central US :) Gating posts takes about 5-15 minutes per day, all depends on how many people are doing it. You basically log in to a website for cctech and click on "accept" if the post is 100% on-topic, or reject if it's not. You then log in to a website for cctalk and click "accept" if it's ok (non-list member post) or "reject" if its one of the few spam that makes it by the filters. When this is done consistently, the list runs smooth and it's very quick & easy to do. When it's not run consistently, it can become a royal pain and consume a lot of time. Doing this gating used to be a very time consuming thing, but since I've made some changes to the mail stream it's not quite quick and easy - as long as it's kept up with. I - and the people on cctech, would greatly appreciate it if a reliable individual with 5 to 15 minutes per day to spare can help out! Jay West

19 years, 4 months

free Grinnell GMR-270 frame buffer for PDP-11

by hardware＠ees1s0.engr.ccny.cuny.edu

Dear Classiccmp Community, I have a Grinnell GMR-270 frame buffer for a PDP-11 to give away. It was given to me as working, but I cannot test it since I do not currently have a working PDP-11 system. It provides color 512x512 output to a monitor, which a included. Also included is the original documentation, which includes technical data and programming information. It seems that it can also act as a frame grabber. It has hardware pan/zoom functionality. It is a regular 19" rack unit, approximately a cube, and weighs around 40 pounds. I am in New York City. If you want it, come and get it. thanks, -kurt

19 years, 4 months

Another disk imaging project

by dave04a＠dunfield.com

Hi Guys, I'm really getting fed-up with the limitations of the PC floppy disk controller. Here's another idea I've had on the back-burner for quite some time, I've mentioned to a couple of you during private correspondance, but here it is for open discussion. The idea is to make a small single-board computer with a microcontroller, a WD2793 or similar floppy disk controller, enough memory to buffer a few tracks, and a high-speed serial port for communication with the PC. The board would have connectors for 5.25"/3" drives and 8" drives, and would properly interface to all drive types. Firmware would be developed to provide read/format/write/analysis capabilities around the more powerful WD chip. Images would be transferred via the serial connection to and from the PC. This should allow us to archive soft-sector formats that are not compatible with the PC, and also to perform these functions under virtually any PC environment. I just haven't had time to design and build the board ... anyone else interested in working together on such a project? Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

19 years, 4 months

1979 HP Collectors Dream 2649A model computer

by dwight.elvey＠amd.com

Hi I was going to correct that spelling but I got distracted by work. I just sent it without doing so. In any case, things like Jell-O are bad to wake in. Dwight >From: "Ade Vickers" <javickers at solutionengineers.com> > >Dwight K. Elvey wrote: > >>From: "Joe R." <rigdonj at cfl.rr.com> >>> >>> LOL! Anybody need an HP >>TERMINAL<<? >>><http://cgi.ebay.com/1979-HP-Collectors-Dream-2649A-model-computer_W0QQ >>>itemZ >>>5230070472QQcategoryZ4193QQrdZ1QQcmdZViewItem> >>> >>> Joe >>> >>> >> >>Hi >> I'm dreaming but just as I reach for the keyboard, I wake up in a cold >sweet. What does that mean? > >It means that either: > >A) the custard went cold while you were asleep. Microwave the sweet until >warm, then consume >B) Your sweet is supposed to be cold. Eat & enjoy. Don't fall asleep in it, >as it will spoil the texture. > > >HTH, >Ade. > > >PS: Ironically, I *do* need an HP terminal.... To get my A700 running! >Unfortunately, being 3000 miles the wrong side of a big lump of water kind >of prevents me from bidding for the "dream computer" of the subject... > >-- >No virus found in this outgoing message. >Checked by AVG Anti-Virus. >Version: 7.0.338 / Virus Database: 267.10.9/72 - Release Date: 14/08/2005 > > > >

19 years, 4 months

unibus backplane list?

by dwight.elvey＠amd.com

>From: "Joe R." <rigdonj at cfl.rr.com> > >At 03:51 PM 8/12/05 -0600, you wrote: >>On 8/12/05, Brad Parker <brad at heeltoe.com> wrote: >>> Is there a list of the various pdp-11 unibus backplanes anywhere? >> >>I do not know of a master list online. >> >>> My 11/44 has a DD11-DF in it which is impossible to get cards into and >>> out of. It's like something is physcally wrong with it. Rather than >>> damage any cards I thought I'd replace it. >> >>It takes a bit of force to get hex cards in a nearly-unused backplane. >> I've bent latches trying to get boards in. > > I've had similar trouble with the HP 1000 boards. I found that if I >clean the edge connectors and them wipe them with a rag slightly dampened >with WD-40 (mostly kerosene, a light oil) that the cards go in and out much >easier and I have a lot less intermitant contacts. I believe the oil >coating also helps reduce oxidation of the contacts. > > Joe Hi From what I've been told, WD-40 contains both silicon and petrolium oils. I prefer using silicon grease for this purpose. Past experiments with petrolium oil and grease showed that the contact resistance increased on clean contacts while the silicon grease showed a significant drop in resistance. I recommend Dow-Cornings, DC-4. Dwight

19 years, 4 months

unibus backplane list?

by dwight.elvey＠amd.com

>From: "Joe R." <rigdonj at cfl.rr.com> > >At 02:31 PM 8/15/05 -0700, Dwight wrote: >>>From: "Joe R." <rigdonj at cfl.rr.com> >>> >>>At 03:51 PM 8/12/05 -0600, you wrote: >>>>On 8/12/05, Brad Parker <brad at heeltoe.com> wrote: >>>>> Is there a list of the various pdp-11 unibus backplanes anywhere? >>>> >>>>I do not know of a master list online. >>>> >>>>> My 11/44 has a DD11-DF in it which is impossible to get cards into and >>>>> out of. It's like something is physcally wrong with it. Rather than >>>>> damage any cards I thought I'd replace it. >>>> >>>>It takes a bit of force to get hex cards in a nearly-unused backplane. >>>> I've bent latches trying to get boards in. >>> >>> I've had similar trouble with the HP 1000 boards. I found that if I >>>clean the edge connectors and them wipe them with a rag slightly dampened >>>with WD-40 (mostly kerosene, a light oil) that the cards go in and out much >>>easier and I have a lot less intermitant contacts. I believe the oil >>>coating also helps reduce oxidation of the contacts. >>> >>> Joe >> >>Hi >> From what I've been told, WD-40 contains both silicon and >>petrolium oils. I prefer using silicon grease for this purpose. >>Past experiments with petrolium oil and grease showed that the >>contact resistance increased on clean contacts while the >>silicon grease showed a significant drop in resistance. >> I recommend Dow-Cornings, DC-4. > > Does DC-4 lower the force required to insert and remove the board? Where >can you get it? Any idea how much WD-40 increases the contact resistance? >Even if it does increase the resistance it has cured many of problems that >I've had with the 1000s so it seems to do more good than harm. > > Joe Hi Joe Most any electrical supply shop has it or can get it. McMaster-Carr list it as well. The measurements were done with petrolium grease but I forget which one. We'd see a normal 10 milli-ohm contact go as high as 20-30 milli-ohms. The silicon grease would usually take a 10 milli-ohm dry contact and reduce it to around 2.5 milli-ohms ( close to our measurement limit, using a 4 point DVM ). These were typical gold-gold edge connectors. It does reduce the force required but not as much as the petrolium grease did. I'd suspect that it might be similar to the wd40, being a lighter oil. Dwight

19 years, 4 months

Analog modem emulator?

by James＠jdfogg.com

> > Just curious...has there ever been a device available to anyone's > > knowledge that functions like an analog phone line and > allows transmission via TCPIP? Get an old phone system with analog station cards (for POTS phones) and stick a system with a modem on one extension with it set to autoanswer and call it with a modem from another extension.

19 years, 4 months

HP 1610A question

by birs23＠zeelandnet.nl

I just got a HP 1610 Logic Analyzer and although its in good shape the monitor is clearly very dead. I did notice that on the bottom there are several DB25 ports, is it perhaps possible to hook up a terminal or something to it and control it from there or something ? I think its a long shot but you never now. Thanks! Stefan. ------------------------------------------------------- http://www.oldcomputercollection.com

19 years, 4 months

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test-drb August 2005