RE: VAXmate PSU
Thanks Eric, I had a private reply that said pretty much the same thing. Last night I replaced the shorted diode and another electrolytic capacitor and the PSU started up on the bench, powering a load board and an RD53 hard disk. Ripple was good except on the -9V output, but that output doesn’t seem to have any capacitors after the final transformer, so I think it is OK. I need to replace a few marginal capacitors on the video module now, while I have the machine in bits. Then I will put it all back together to see that it still works. I have a lingering worry that the failed diode was on the +28V supply to the video module and that there might be a fault on the video module, but it doesn’t appear to present a short circuit, so I am hopeful. I will do a blog post once it is all back up and running. Thanks Rob From: Eric Smith Sent: 16 April 2020 00:05 To: r...@jarratt.me.uk; Rob Jarratt ; General Discussion: On-Topic and Off-Topic Posts Subject: Re: VAXmate PSU On Fri, Apr 10, 2020 at 10:14 AM Rob Jarratt via cctalk mailto:cctalk@classiccmp.org> > wrote: D12 is an MBR3045PT. It tests correctly as a common cathode diode network. However, the forward voltage seems to be 0.19V. The datasheet (https://pdf1.alldatasheet.com/datasheet-pdf/view/53622/FAIRCHILD/MBR3045PT.html) would suggest it should be 0.76V at room temperature. I can see no physical damage to it though. Even when they are good, the forward drop of a diode can be FAR lower than the typical forward drop (around 0.7 for normal silicon diodes) if you're putting significantly less that the rated current through it. 0.19V forward drop is only slightly lower than typical characteristic at e.g. 10mA current. See figure 3. I've seen more than enough variation of diodes from typical curves for that alone to convince me that the diode is bad (though obviously it may be). The real test is how much it conducts in reverse. All diodes will pass a small amount of reverse current. This one shouldn't pass more than 1 mA in the reverse direction at room temperature, even with near the rated reverse voltage (45V) applied.
Re: Core Memory Photo
I have three others with the cover still on :) I want to make a clear plexiglass cover for them. Also have the driver boards. On 2020-04-15 13:00, cctech-requ...@classiccmp.org wrote: Send cctech mailing list submissions to cct...@classiccmp.org To subscribe or unsubscribe via the World Wide Web, visit http://www.classiccmp.org/mailman/listinfo/cctech or, via email, send a message with subject or body 'help' to cctech-requ...@classiccmp.org You can reach the person managing the list at cctech-ow...@classiccmp.org When replying, please edit your Subject line so it is more specific than "Re: Contents of cctech digest..." Today's Topics: 1. Re: Core Memory Photo (ke...@saracom.com) 2. Re: Core Memory Photo (Fred Cisin) 3. Re: Core Memory Photo (Joshua Rice) -- Message: 1 Date: Mon, 13 Apr 2020 13:05:03 -0400 From: ke...@saracom.com To: cct...@classiccmp.org Subject: Re: Core Memory Photo Message-ID: Content-Type: text/plain; charset=UTF-8; format=flowed "Ouch. Looks like that core took a serious hit." Yep it did. We ran the microscope into it at the lab. Ouch. Someone had asked for a picture of core memory without the cover so I thought it would do. -- Message: 2 Date: Tue, 14 Apr 2020 09:53:39 -0700 (PDT) From: Fred Cisin To: "General Discussion: On-Topic and Off-Topic Posts" Subject: Re: Core Memory Photo Message-ID: Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed On Mon, 13 Apr 2020, keith--- via cctalk wrote: "Ouch. Looks like that core took a serious hit." Yep it did. We ran the microscope into it at the lab. Ouch. Someone had asked for a picture of core memory without the cover so I thought it would do. It is beautiful! -- Message: 3 Date: Wed, 15 Apr 2020 10:09:38 +0100 From: Joshua Rice To: Fred Cisin , "General Discussion: On-Topic and Off-Topic Posts" Subject: Re: Core Memory Photo Message-ID: <353a7ae4-a147-4a06-9afd-4a3398fab...@btinternet.com> Content-Type: text/plain;charset=utf-8 Was beautiful. That?s pretty mangled now. On Apr 14, 2020, at 5:53 PM, Fred Cisin via cctalk wrote: On Mon, 13 Apr 2020, keith--- via cctalk wrote: "Ouch. Looks like that core took a serious hit." Yep it did. We ran the microscope into it at the lab. Ouch. Someone had asked for a picture of core memory without the cover so I thought it would do. It is beautiful! End of cctech Digest, Vol 67, Issue 15 **
Sun 3 and memory
Hi everyone, Update on the barn-find Sun 3/260 that I have been restoring and was supposed to exhibit at VCF PNW until the show was cancelled for some odd reason. The system had been failing to get through self-test because, in the memory tests, bit 13 was always set, whether intended or not. I borrowed a couple Sun 501-1102 boards (8M ECC memory for VME) and one of them passes the self-tests and, if I had a bootable device, the system is now ready to try that. But my question here is about Sun 3 memory. Sun part 501-1102 is described as Sun 3/2xx, 3/4xx, and 4/2xx memory (The Sun System Handbook does not list it as 3/4xx memory). The memory board that worked is tagged 501-1102 and was described as memory to go along with a Sun 3/160 CPU board. I was loaned both boards in case the problem was the backplane. But the System Handbook does not list that memory as an option for that CPU. Does anyone here know whether a 501-1102 memory board be used with a 3/160 CPU? Does anyone here know whether Sun 3/260 schematics are available anywhere like the 3/160 and 3/60 ones are? I would like to give repairing the memory board that came with the 260 a shot, since that is a better story when I exhibit it and the memory board that I have that works now is a loaner. Finally, will a SD2SCSI (configured as 2 Sun0424 drives), Archive 150M QIC drive, or CD-ROM drive work on the 3/260 if I connect them up to the SCSI cable for the QIC-24 drive that the system came with? alan
Old X11/Xt/Motif books
Going through old books. If no one wants these then they go to the tip. Willing to deliver locally, split shipping over a distance. David O’Reilly Volume 4 X Toolkit Intrinsics for version 11 Volume 5 X Toolkit Intrinsics for X11 R4 and R5 Volume 4 X Toolkit Intrinsics (Motif Edition) For OSF/Motif 1.2 Volume 6A Motif Programming Manual for OSF/Motif 1.2 Volume 6B Motif Reference Manual For Motif 2.1 OSF Published OSF/Motif Programmer’s Reference Release 1.2 OSF/Motif Programmer’s Guide Release 1.2 OSF/Motif Style Guide Release 1.2 By Eric F. Johnson/Kevin Reichard X Window Applications Programming Advanced X Window Applications Programming Advanced X Window Applications Programming Second Edition (Missing CD) Power Programming Motif Second Edition (1.2)
Re: anybody have MOVIE.BYU?
On 2020-04-15 14:34, Jon Elson via cctalk wrote: > Well, I didn't look in the right place. I just stumbled across what I > think is the full install of BYUMOVIE > 4.3 from December 1982. > > If anyone is interested, I could pack it up and send it to you. This was > for VAX/VMS. The directory contains 67 files. SURE, I would be very interested! Thanks!
Re: anybody have MOVIE.BYU?
On 01/13/2017 10:57 AM, Jon Elson wrote: On 01/13/2017 12:46 AM, Randy Dawson wrote: The famous Brigham Young University 3D graphics program, by Dr. Hank Christensen. I am looking for the fortran source, it should be 7 files: OH MY! I definitely had that at one time - a LONG time ago. I think it was on one of the DECUS tapes. I took a quick look at some of the backups I now have online, and did not find it. A lot of stuff that I used to have has been junked, as it was presumed to be available form somewhere else. There seem to be some links under "movie.byu" Any docs related too. I think the docs were just text files included with the source code. Well, I didn't look in the right place. I just stumbled across what I think is the full install of BYUMOVIE 4.3 from December 1982. If anyone is interested, I could pack it up and send it to you. This was for VAX/VMS. The directory contains 67 files. Also, I have come across my own version of NASA's Mini-VICAR program. Mini-VICAR was a ghastly hack of their image processing library that used pre-allocated files on a stripped-down file system to improve performance. So, your files were named something like [100,103]. I took the routines that I thought would be useful and modified them to use ordinary Files-11 files on VMS, and used the Tparse table-driven command line parser. I should have published this on DECUS back in 1982 or so, but never got around to it. Mostly, because I never wrote documentation for it. (177 files, mixture of macro and fortran.) Jon
Re: Core Memory Photo
Was beautiful. That’s pretty mangled now. > On Apr 14, 2020, at 5:53 PM, Fred Cisin via cctalk > wrote: > > On Mon, 13 Apr 2020, keith--- via cctalk wrote: >> "Ouch. Looks like that core took a serious hit." Yep it did. We ran the >> microscope into it at the lab. Ouch. Someone had >> asked for a picture of core memory without the cover so I thought it >> would do. > > It is beautiful! > > >
