test-drb May 2015

test-drb@ccmp.vtda.org

199 participants
259 discussions

by r_a_feldman＠hotmail.com

>Message: 6 >Date: Mon, 11 May 2015 17:41:16 +0000 >From: tony duell <ard at p850ug1.demon.co.uk> >Subject: RE: VCF Ban, Vector Graphic cards, Wright card punch, MDS >Keyboard <snip> >My biggest worry is that my will will not be found and/or my next of kin will not >get contacted. He isn't a relative of mine, just a very close friend. He is the >beneficiary of my will and the exector, but if this is not realised he might not >get what he should. I am wondering if there is some way of ensuring he gets told >if anything should happen to me (not that I am planning anything like that, but...) > >-tony Probably the best thing you can do is let the next of kin know that you have a will and either give them a copy or tell them what your wishes are. Then put a copy of the will where it can easily be found (such as in your desk drawer). My wife and I are redoing our will and are letting our sons and my brothers know what we are planning. They all will know where to look for the official copy of the will. Bob

10 years, 2 months

Wanted: AT&T 3B2 (buy or borrow) near Seattle

by lists＠loomcom.com

Folks, I started working on an AT&T 3B2 emulator using the SIMH platform late last year. As these things often do, it got side-tracked by life. We moved to Washington state in January, and I've been consumed with other matters since then. I'd like to finally get back to the 3B2 emulator. Having physical access to a real 3B2 would make this process much, much easier, especially one I could put custom homebrew ROMs into. If you have any 3B2s you'd be willing to let me borrow or buy, please drop me a line. I'm located about an hour from Seattle, WA in Kitsap County. Or, if you're interested in a trade, I have some PDP-11 Qbus gear I'd be willing to part with, too. -Seth

10 years, 2 months

CompuServe SC-40 Progress

by b4＠gewt.net

Hello, I've managed to image some of the SC-40 drives (currently just for personal backup use due to any legal issues/possible customer data). I've found in the documentation references to a file named COUGH.DRP which seems to be the CompuServe equivalent of the TOPS-10 Monitor Calls Guide. Does anyone have a copy of the CompuServe COUGH DROPS file scurried away somewhere? It would be very useful in discerning the patches to TOPS-10 and some SC-40 extensions. -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects

10 years, 2 months

Dead RF31 DSSI Disk.. A508 SOLVED!

by jnc＠mercury.lcs.mit.edu

Holm Tiffe wrote: > Yes guys, it's true. > I've successfully "repaired" the drive with an careful hit from a > rubber-hammer! I am pretty blown away! Hard to believe that a disk can be fixed with that kind of treatment! But I shouldn't be. Remember that scene in one of the early Stars Wars movies where they go to make the jump to hyperspace (or something like that), and nothing happens, and Hans gets up and whacks the bulkhead in a very particular spot, and then it works? I first saw that movie with a couple of people from the MIT computer lab, and we were all convulsed with laughter at that scene. One of our mainframes had a sticky power relay, and when you hit the 'power off' on the front console, nothing would happen. So you'd walk around to the back of the machine, open a door, and give a particular box a good whack in a particular way with your fist, and it would power off. Some things just never change! Noel

10 years, 2 months

Available in NY 10512 - CDC 721 Plato Terminal boxed.

by curt＠atarimuseum.com

Hi have a boxed CDC 721 Plato terminal, making room so need to sell/trade it. Its VERY heavy and would prefer someone pick it up. Please contact me off list - curtv2015 at gmail.com Thanks, Curt

10 years, 2 months

Running a Z8-02 MPD on a breadboard

by spacewar＠gmail.com

Some time back I acquired a Zilog Z8-02 MPD. This is the bond-out version of the Z8 microcontroller. The normal Z8 contained 2K of internal masked ROM and was packaged in a 40-pin DIP. The Z8-02 had no masked ROM (or possibly the masked ROM was disabled), and the address and data buses for the internal ROM, along with a few clock and control signals, were brought out to the extra 24 pins of a 64-contact ceramic leadless quad-in-line package (QUIP). Typically for emulation it would be used with a 2716 EPROM, or 2KB of RAM with address and data multiplexers for a fancy emulator. The ceramic leadless QUIP package was used for bondouts from Intel and Zilog, and later, for the Intel iAPX 432 components. Later it was replaced with the square JEDEC ceramic leadless package. Note that the ceramic leadless QUIP is unrelated to the more common leaded QUIP packages used by NEC, Rockwell, and Motorola. Unlike many modern leadless packages (DFN, QFN, BGA), the ceramic leadless QUIP is intended for use only in a socket, which was made by 3M. Today the sockets are even harder to find than the chips that require them. I designed a simple QUIP adapter for use with solderless breadboards, and wired up a Z8-02 MPD along with a 28C16 EEPROM for the program memory, a 62256 static RAM, address latch, and decoder. I programmed a copy of the Z8671 Basic/Debug interpreter into the EEPROM. To my amazement, it worked the first time. Photos: https://www.flickr.com/photos/22368471 at N04/sets/72157652653732622 The last "photo" is a screen shot of Kermit talking to it. I've entered an inefficient program to search for primes, and the screen shot shows it being LISTed, RUN, and then stopped after a few primes have been found. Not shown, I printed the value of some of the interpreter's globals, to verify that the static RAM was recognized properly. (The interpreter can actually provide minimal functionality with no external memory!) While Zilog only claimed it to be a subset of Dartmouth BASIC, the interpreter does not include the FOR statement, so IMNSHO it barely even qualifies to be considered a "tiny BASIC". The competing National Semiconductor INS8073 had 2.5K of ROM, and Intel 8052AH-BASIC had 8K, so they supported more features of BASIC.

10 years, 2 months

HP-1000 and PDP computer parts available

by marc.verdiell＠gmail.com

Perfect timing! My new old HP 1000 is coming in a few days and it's missing some of the cards you have. I'll take your HP 1000 cards if we can agree on price. I will contact you off-line. Marc >From: HP Friedrichs <hpfparts at yahoo.com> >Subject: HP-1000 and PDP computer parts available >I have a sizable collection of HP-1000 circuit cards, as well as a couple >of PDP cards. >They take up a lot of space in my workshop, so I'd like to find a home for >them. >Please see my web site here for a complete list of parts: >The H.P. Friedrichs (AC7ZL) Homepage >Thanks and 73,PeteAC7ZL > View on www.hpfriedrichs.com

10 years, 2 months

FREE: Amiga 1084S Monitor

by slandon110＠gmail.com

FREE Commodore Amiga 1084S Monitor. You just pay shipping. Needs some soldering on the video connector and the power switch. Otherwise it works fine Located in Farwell Michigan. You can pick it up or pay shipping Steve

10 years, 2 months

HV tracking across flexible PCB strips

by jules.richardson99＠gmail.com

I really couldn't think how best to word the subject. I pulled the CRT out of the HP 1331 X-Y display that I got the other day, then took all the old tape off, cleaned it up, and reassembled with new tape. It's no longer arcing around the CRT face, which is good. However, there's a flexible plastic strip running between the CRT face and the chassis which carries three lines (it's a storage tube rather than a conventional CRT) and I'm still getting periodic arcing across these lines which of course upsets the display's operation. As far as I can tell, there's no 'sandwich' (and hence glue) involved - it's just a single plastic strip with conductive traces drawn onto it. Does anyone have experience of these kinds of strips in an HV environment, and what (if anything) can be done for them when they start to fail? Possibilities seem to be: 1) Try some more cleaning, 2) Reworking with conductive paint (I wondered if one or more of the traces have gone high resistance in certain spots and this is encouraging the HV to arc between them 'upstream' of such areas), 3) Plastic itself has broken down in some way, requiring replacement; has anyone managed to make a replacement strip from scratch? Although I've not tried the actual X/Y/Z inputs yet, basic write/store/erase functionality and beam movement via the front X/Y controls seems to be working so long as the arcing isn't occurring, and it'd be a fun little gadget to get working. cheers Jules

10 years, 2 months

HV tracking across flexible PCB strips

by jnc＠mercury.lcs.mit.edu

> From: Jules Richardson > ... "splice tape" is rated for close to 22kV. > Of course that's *through the tape* though, so although it would > insulate the conductors from the outside world, it's not clear how > effective it would be at insulating the two conductors that are only a > couple of mm apart; the tape doesn't really play a part in that > scenario, only the glue. Maybe I'm misunderstanding something, but why not apply a layer of tape immediately on top of the conductors - since a thickness of .X of a mm (through) will insulate 22KV, Y mm (across - where Y is the distance between the conductors) definitely ought to do it. Although there is the glue that holds it down - I wasn't sure if that was the glue you were referring to, or if you meant some other glue - that might not be as insulating (or maybe it is, just don't know). But, anyway, if the glue might be an issue, you'd have to apply the tape non-glue side down (and stick something like regular electrical tape to it, glue-glue, to nullify its glue on the now-up-facing side - unless you want to use that to join the two layers of the original together). As to how to get it to adhere: if you can figure out what the insulating glue was that they used originally, or some modern facsimile thereof, you could use that. Noel

10 years, 2 months

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test-drb May 2015