test-drb

test-drb@ccmp.vtda.org

101090 discussions

Testing H7864 (MicroVAX II) PSU With No Load

by robert.jarratt＠ntlworld.com

Some of you may recall I have a faulty H7864 PSU, which failed a while ago with a loud pop, but no obvious physical damage. I replaced the blown transistor (on the primary side of the large transformer), but when I power it on, the transistor does not switch and there is no output, so clearly there is still a problem somewhere. I have been spending some time drawing schematics for almost the whole thing. I am now at the point where I intend to compare it with a working one, probing each one side by side, to see up to where it appears to be working. It would be awkward to have two dummy loads, just for lack of suitable equipment. Does anyone know if it is safe to run these PSUs with no load? Would my testing be valid without a load? Thanks Rob

10 years, 5 months

WTB: Unix/Solaris Adobe FrameMaker 8

by other＠oryx.us

I am looking to purchase/acquire a copy of Adobe FrameMaker 8 for Unix/Solaris. Straight from Adobe, FrameMaker had always been a pretty pricy item, but I had always managed to acquire a legal copy, sometimes years old and after the fact through eBay, etc. And through that method, I own legal copies+media of 5.x, 6.x and 7.x for Unix and Mac. I had hoped to purchase a copy of version 8 via a similar method, but several years have passed by, and I have never seen a copy of version 8 for sale. After version 8, FrameMaker was significantly changed and released for dos/windows only. I believe that the current version is 11.x or above. Also, in case it isn't obvious, this is for myself for home use only. Jerry

10 years, 5 months

RSX-11M-PLUS SYSGEN printouts

by jnc＠mercury.lcs.mit.edu

An 11/84 I bought came with a couple of RSX-11M-PLUS V4.3 SYSGEN printouts; I don't intend to run RSX on the machine, so is there any use to this printout, or should I recycle it? If someone has a use for it, I'd be happy to send it to them. Noel

10 years, 5 months

scrounging at recyclers

by sales＠elecplus.com

Often I come across various obsolete boards that SEEM to be what you guys want, but I am never really sure. This week I passed up a large (at least 24" per side) HP server mainboard from the 70s, and some Wang boards from the same period. Since I no longer have the warehouse, I have no way to keep them until somebody says they want it. My question is, what should I bring home? I do not have email access while I am scrounging, so I can't post to this list. What besides old DEC boards are wanted? Cindy --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

10 years, 5 months

PDP-11/45-55 CPU fan assemblies

by jnc＠mercury.lcs.mit.edu

> From: Tony Duell > IIRC that 21" mounting box (and I assume therefore the fan assemblies) > was used on other machines like the 11/40 (some versions), the 11/70, > etc. Yes, I _think_ the hardware was identical - I had an 11/40 for a year or two 'back in the day', before I got upgraded to an 11/45, but it's been a _long_ time since I've seen one, so I can't be positive. I tried to find parts numbers in the drawings, but none of them (11/40, /45, or BA11-F) had them. > the bottom one is a right pain, involving removing all the boards and > dismantling the very fragile card guides ??? Mine still has the card guides in place, although the bottom fan assembly is gone? Thanks very much for the offer of help, but let's see what Henk turns up! > From: Henk Gooijen > The colors of the /55 are quite different from the 11/45. Well, I did say that the front console was different! :-) But other than that, I am pretty sure they are otherwise identical: same backplane, same CPU boards (although the /45 can be found with both the KB11-A and KB11-D variants; I _think_ the /55 only comes with the -D), etc. > all 21" boxen (BA11-F ?) My manuals say the 11/40 one is a BA11-FC, and the 11/45 is a BA11-FA. Not sure what the difference is - maybe it's that the /45 has two H742's in it, and the 11/40 has only one? Although I guess those are mounted on the cabinet (although they are in some sense still part of the CPU chassis). Maybe it's the different power harness/etc? > The box is (AFAIR) mounted on the card cage with 4 or 6 (?) screws. Mine looks like it uses 6. Anyway, thanks very much, I have my fingers crossed that you will find both of them when you look! :-) Noel

10 years, 5 months

Has anyone hear of the Computer History Archives Project?

by COURYHOUSE＠aol.com

Yes they are doing some good things! check out the video on the Librascope! Ed# In a message dated 10/20/2015 3:39:37 P.M. US Mountain Standard Time, chrise at pobox.com writes: On Tuesday (10/20/2015 at 04:57PM -0500), Jay Jaeger wrote: > On 10/20/2015 1:35 PM, Christian Liendo wrote: > > I found a channel that's about a Month old, but no real information as to who they are. > > > > > > Computer History Archives > > Educational Vintage Computer Films > > View on www.youtube.com > > > > https://www.youtube.com/channel/UCOyJD0RHtF_77_oAf5tT1nQ > > > > Nice narration... https://www.youtube.com/watch?v=-KuoZ6cades I have two Vicalloy tapes from a UNIVAC I. Anybody have a UNISERVO drive we could read them on? ;-) Chris -- Chris Elmquist

10 years, 5 months

IBM System/32 available

by ball.of.john＠gmail.com

>I think I found Mike's Youtube videos of one of his other System/23. It even has >blinkenlights! Dang it, now I'm trying to figure out where I'd hypothetically stick a >System/23 in my little house. Probably in the breakfast nook, assuming it would even >fit through the front door. I doubt it could make the turns into my computer room. If I >call it a "desk" and then put more computers on top of it, then does it really occupy >any space? :) I remember trying to figure out logistics on that System/32 that was on ebay out east for like $50 on ebay a few years ago. Don't remember if it sold or not butabsolutely nothing I could come up with made transporting it out west affordable. -John

10 years, 5 months

usb-to-parallel port solutions

by dave＠661.org

Can somone recommend a good USB-to-parallel port solution that will easily work with Linux? -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

10 years, 5 months

RK07 Manual Dual Port?

by cube1＠charter.net

After seeing an M7706 on eBay (and realizing I already have a spare), but no dual-port card (M7730), and reading instructions in the maintenance manual regarding placement of a single M7706 drive interface card in either slot, depending upon whether A or B is selected I began to wonder... Is there any reason one cannot do a manual dual port on an RK07 by having both M7706 slots populated, but then only ever selecting A or B using the buttons on the RK07? Has anyone ever done that? The existence of two separate wire list pages in the schematic, and a quick look at the M7706 diagram output signals suggests that this would *not* work - that the output lines of the two M7706 cards are wired together on a single-port drive and driven by ordinary TTL, and that a dual-port drive had different wiring on the backplane, even though the card cages are the same and the backplane itself is the same. JRJ

10 years, 5 months

Front Panels - Update

by rodsmallwood52＠btinternet.com

Hi Guys Things are proceeding well. The girls are deciding the best way to do the matte finish layer I'm confirming exactly where the hole for the lock should be to be so the panel can be pre-drilled. One kind list member is shipping me an old damaged panel in from the US which will help with both of the above. Rod

10 years, 5 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb