test-drb

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101090 discussions

by aperry＠snowmoose.com

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

6 years, 3 months

VAXmate PSU

by robert.jarratt＠ntlworld.com

I have posted here a couple of times because I have a failed VAXmate PSU. I have just posted a little bit more information here: https://robs-old-computers.com/2020/03/28/further-analysis-of-the-vaxmate-h7 270-psu-failure/ with some scope traces and a greatly improved schematic. Although the schematic is likely to have errors still. Unfortunately, a stray scope probe ground lead blew the fuse so now I have to wait for a new fuse to arrive before I can continue work. I would really like to know if all the spiking I am seeing is to be expected, and any suggestions why it appears to be detecting an overcurrent? There do not appear to be any shorts on the secondary side, but that could be wrong of course. I don't know if a genuine short anywhere would cause it to trip the SCR quite so quickly (within 20ms of the switching transistor starting to switch). Any thoughts gratefully received. Thanks Rob

6 years, 3 months

Old X11/Xt/Motif books

by barto＠kdbarto.org

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)

6 years, 3 months

DEC VR290 Colour Monitor, free to good home (UK)

by Aaron.Jackson＠nottingham.ac.uk

I have a DEC VR290 colour monitor for use with VAXstations. It was working fine when I last powered it on (2-3 years ago), hooked up to a 3100 M76. It's free to a good home (preferably a home with a VAX), absolutely collection only. I'm in Nottingham UK. It's too heavy and large to ship safely. I have two video cables which are intended for use with it. I think they are both for VAXstations of some kind, one might be for DECstation. You've welcome to have them both with the monitor. Please let me know if you are interested. If in the unlikely event there is more than one person interested, it'll be mostly whoever picks it up first but I will prioritise those who actually do have a suitable VAX to use it with. Also, if there are any documentation hoarders I have an entire book case of VAX/VMS manuals (thick red binders). Full list is here, let me know if you want any. aaronsplace dot co dot uk / dec-manuals.html Cheers, Aaron This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please contact the sender and delete the email and attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. Email communications with the University of Nottingham may be monitored where permitted by law.

6 years, 3 months

Prime 50-Series emulator announcement

by drb＠msu.edu

I'm reposting this announcement from Jim Wilcoxson. De #### Newsgroups: comp.sys.prime Date: Wed, 11 Mar 2020 08:34:13 -0700 (PDT) Message-ID: <0c560b91-35d2-4dcc-b859-a8eb4d22bd17 at googlegroups.com> Subject: Prime emulator source released on GitHub From: Jim Wilcoxson <prirun at gmail.com> Today, with much help from Dennis Boone, I'm releasing the Prime emulator source code on GitHub for non-commercial use. This is the full version of the emulator running on Linux and supports: - all Prime CPU modes: 16S, 32S, 32R, 64R, 64V, 32I - all Prime models, from the P400 to P6550 - up to 512MB of memory, depending on the Primos rev and CPU - a system console - 128 incoming telnet terminal connections - 8 disk controllers, 8 drives each - support for all 25 disk drives sold by Prime - a tape controller, 4 drives, using the .TAP format - a PNC controller emulating RingNet over TCP/IP - a bypass for Primos system serial number checks - Unix utilities to read/write physical tapes & Magsav tapes Dennis owns the emulator GitHub repo and has also kindly agreed to take over hosting of the public Prime emulators that have been online since 2008. There are 7 public emulators running in a virtual Prime ring, allowing both remote terminal sessions (netlink) and remote disk access via PrimeNet. The Prime emulator on Linux is currently running 45-55 Prime MIPS in 64V mode. A wide range of Prime software is loaded on the public emulators: - ftn screaming fast Prime Fortran 66 compiler, written in assembler - f77 the not-so-screaming but full-featured Fortran '77 - pl1g the PL/I Subset G compiler - pl1 the full PL/I compiler - plp the original Prime systems language (like PL/I) - spl the 2nd generation Prime systems language - cc the C compiler written by Garth Conby of Pacer Software - pascal the Pascal compiler - modula Wirth's successor to Pascal - dbg Prime's source level debugger rivaling modern debuggers - pma the Prime assembler - basicv the Prime BASIC compiler - cobol the original Prime COBOL compiler - cbl the Prime COBOL '74 compiler - emacs the full screen editor still used by many today (me!) - midas the Prime indexed sequential file software This week we are working on releasing Prime disk images for all of the public emulators to make it easy for others to get their own Prime up and running. For the truly adventurous who want to bootstrap their own Prime system, there are links in the emulator readme to Prime tape images at Bitsavers and to a large library of Prime manuals. I learned more about operating systems, compilers, concurrency, and other systems programming topics by reading Prime source code, making changes to Primos, and fiddling with Prime hardware, than I did from all of my college degree work. I loved Prime computers, Prime software, Prime hardware, and the Prime Computer company, and am grateful to all of the former Prime engineers that provided this robust and interesting hardware and software platform. I hope you enjoy it too! https://github.com/prirun Jim

6 years, 3 months

Core Memory Photo

by keith＠saracom.com

"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.

6 years, 3 months

Prime Sample System Releases

by Kevin＠rawfeddogs.net

Prime Fans, I just noticed on comp.sys.prime that I missed a couple of sample system releases. I have a process set up to dump messages from some news groups into my IMAP server for easy reading with my mail client, but I don't have anything set up to easily reply via the news groups. Does anyone know what's new in the recent sample system releases? -- Kevin http://www.RawFedDogs.net http://www.Lassie.xyz http://www.WacoAgilityGroup.org Bruceville, TX What's the definition of a legacy system? One that works! Errare humanum est, ignoscere caninum.

6 years, 3 months

Computing and communicating in a COVID-19 world

by c.murray.mccullough＠gmail.com

The virus-world we are living in has seen Internet usage dramatically increase world-wide. Thanks to pioneers like Cerf, Kahn, Crocker and Kleinrock, sounds like a law firm, paved the way for the packet-switch system Bell & others fought to prevent. I recall the early days of computing, classic, retro or otherwise defined, that was slow, but had to do more than now, as the hardware wasn?t so great or more accurately small and fast. Their were machines that allowed us to communicate at 300 baud and I was happy! Stay safe. Happy computing and communicating. Murray ?

6 years, 3 months

Core Memory Photo

by keith＠saracom.com

Here is a link to pictures of core memory from a PDP1145. https://devilanse.wordpress.com/2009/11/03/nablopomo-digital-equipment-corp…

6 years, 4 months

RIP John H Conway - Creator of the game of life

by frank＠tuccio.net

https://en.wikipedia.org/wiki/John_Horton_Conway

6 years, 4 months

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