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101090 discussions

OT: lenses (Was: Front Panels - PDP8 and PDP 11

by COURYHOUSE＠aol.com

Paul - My darkroom became a storage room! still have the monster 5x7 durst enlarger w/ vacuum easel that I had since the 70s. what a beast! then I have small 2x3 omega to pull strips of negatives though to print. yea the digital stuff was a game changer indeed... I do not know about the contax rts lenses fitting new bodys.. they were nice lenses, It would be good to use them! Ed# In a message dated 3/10/2016 12:41:11 A.M. US Mountain Standard Time, useddec at gmail.com writes: I also don't know if I will ever use my darkroom again, and have Omega D2, other enlargers, print washers and dyers, etc that I don't need. On Thu, Mar 10, 2016 at 1:37 AM, Paul Anderson <useddec at gmail.com> wrote: > Popular or Modern Photography 20 or 30 years ago had an article on the 10 > best lens ever made. I think Zeiss made 3 of them, and they were the only > company with more than one. > > I know there are a lot of great optics out there, but I still love Zeiss. > I have several Zeiss cameras, binoculars, microscopes, etc. > > With everything going digital, and various health problems, I haven't > touched my Contax RTSs in years. I was planning on buying a digital body to > use my optics, but they never released one. > > If anyone knows of a good digital body that will adapt to RTS optics, > please let me know. > > Paul > > On Wed, Mar 9, 2016 at 7:25 PM, Fred Cisin <cisin at xenosoft.com> wrote: > >> posters! The lens was a Goerz Red Dot Artar and the sharpest flat >>>> field lens >>>> >>> On Wed, 9 Mar 2016, Rod Smallwood wrote: >> >>> Thanks,, >>> Our cam was fitted with a high grade Ziess lens that cost a fortune >>> even then, >>> >> >> Zeiss made a lot of lenses, some of which were great. >> Goerz made a few of the greatest lenses ever made. >> >> For personal use, I'm looking for Leitz Summicron in all focal lengths, >> and Nikkor 105mm that was made in mid 1960s. >> And, if I can ever get a 4x5 digital back, I want a Goerz Dagor. >> All out of my price range. >> >> >> >

10 years, 1 month

Xerox: MFM emulator: disk images available

by tmfdmike＠gmail.com

I've been hacking Xerox recently and using Dave's excellent MFM emulator. I'm making two working bootable images available. One is Lisp - the 'Lyric' distribution. It boots and works and appears complete and useful but I haven't explored Lisp enough to grok it. The other is a clean install of Viewpoint 3.1 with document editor and a few assorted utilities and games - and terminal emulators. Both come with readme files and configuration info. They can be picked up at: http://corestore.org/vpemu.zip and http://corestore.org/lispemu.zip With a following wind I may get other Xerox disk images up in the not too distant future - Star; 8010 and 8090 servers for starters. Maybe a Medley Lisp system. I'd be interested in hosting any other useful images for disk emulation - not just Dave's and not just Xerox - SCSI2SD etc. too - that anyone feels like contributing. Enjoy! Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

10 years, 1 month

Speaking of card cages...

by cramcram＠gmail.com

Has anyone ever reproduced the card guides used in the 8/A chassis? I assume these are identical to those used in PDP-11s as well. My are beyond brittle. Thanks, Marc

10 years, 1 month

QSIC update

by jnc＠mercury.lcs.mit.edu

> From: Henk Gooijen >> He's now starting in on interrupt cycles; once those work, he >> effectively has emulation of a minimal small RK > sounds very good - nice progress! Interrupts are now working, and as of yesterday (when I finally managed to get all the bugs out of my diagnostic - we can't use the DEC ones since it doesn't yet emulate a full RK drive) it will sit and read and write blocks as long as we let it, interrupting after each transfer. I'm about to upgrade the diagnostic to test more features, such as multi-block transfers, etc. Dave is about to start work on SD card support. > When you get to it, that will be a fast swap drive ;-) Indeed! It seems to transfer a complete sector in about 600 usec, when running a 'disk' in RAM - it's only even that 'slow' because for some reason, which Dave is investigating, the CPU (an 11/73) seems to take about 1usec to do a DMA grant after the previous cycle, even when it and the QBUS are idle (the CPU is in a WAIT instruction while the transfer is happening, with my diagnostic). Each individual word seems to take about 900 nsec; not great, but not bad. Dave's going to look at that in some detail, too. And of course there are zero seek and rotational delays, so it will be pretty zoomy (although of course the SD 'disk' will also have that characteristic, but we don't yet know if the SD will support the full QBUS bandwidth, the way the RAM certainly will). But even if it is that fast, it's still probably worth having the RAM disk, because it will avoid putting write cycles on the SD card memory. (I myself plan to put /tmp, and pipes, on a RAM disk, for just that reason. In V6 Unix, at least, a system call to move pipes off the root disk is one line of code... :-) Noel

10 years, 1 month

Sequoia Computer Systems?

by jwest＠classiccmp.org

Anyone have any pictures, datasheets, or other ephemera related to Sequoia Systems line of fault tolerant systems? This is unrelated to the "IBM Sequoia". The Sequoia computers I'm referring to were around roughly '86+ish maybe and were fairly large minicomputers. Their claim to fame was being "massively fault tolerant". I am not sure, but Ian Sandler may have worked there on that design before heading to General Automation perhaps, not sure I have my history right. What I do recall for sure, is I worked on a lot of programming on the Sequoia systems (the ones I used ran Pick or one of the MVRDBMS's) at Eagle Snacks (back when that was part of the Anheuser-Busch family). On a whim I decided to google and while I can find a few white papers on the Sequoia Fault Tolerance design, I see no marketing brochures, datasheets, pictures, etc. I do recall a story from back when I worked there. the head of eagle snacks was called into the office of the VP of AB for a dressing down, because all the other departments submitted downtime reports to him on their systems and Eagle Snacks (running on the Sequoia) did not submit any reports for over a year. When asked why he wasn't submitting downtime reports the eagle snacks guy replied "because we haven't had any". The VP said - yes, but I see here maintenance logs that you had cpu boards failed and replaced, memory boards failed and replaced, "etc etc". and the ES guy said "Right. No downtime". Anyone remember these systems? Best, J

10 years, 1 month

PDP 8/A restoration (update to squaring up card cage)

by jws＠jwsss.com

One of the photos of the PDP 8/A 400 came from this Herb Johnson page, which is a diary of what I'm going to be doing after I true up the card cage. Excellent looking diary of what to check with the unit I have. Hopefully with less drama and more things checking out. http://www.retrotechnology.com/restore/8a_repairs.html thanks Jim

10 years, 1 month

Early Microprocessors in Industrial Microcomputers

by billdegnan＠gmail.com

Not a lot is said about early use of microprocessors in industrial microcomputers. Everything you read about is so home computing oriented, but I believe actual sales would have been greater in the industrial space 1974-77. I compiled a quick thread on my site about the earliest use of microprocessors in industrial microcomputers on my web site with links to a related article from EDN Microprocessor Design Series Volume II and scans of Process Computer Systems product brochures. PCS was a pioneer in industrial micro-computing. If anyone has info to share / correct please let me know and I will add to the thread. http://vintagecomputer.net/browse_thread.cfm?id=631 -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

10 years, 1 month

OT: lenses (Was: Front Panels - PDP8 and PDP 11

by COURYHOUSE＠aol.com

I need a 90 mm summacron for my m2 (drop me a line off list if anyone has one) Yes I know the 105 f 2.5 nikkor you speak of great sharp portrait length lens for the nikon F! we have a small 105 mm red dot Goertz we used for copy work on 2 1/4 x 3 1/4 in compur shutter the one on the Robertson process camera I used in the 70s was 18 inch focal length as I remember. Ed# In a message dated 3/9/2016 6:53:06 P.M. US Mountain Standard Time, healyzh at aracnet.com writes: > On Mar 9, 2016, at 5:25 PM, Fred Cisin <cisin at xenosoft.com> wrote: > >>> posters! The lens was a Goerz Red Dot Artar and the sharpest flat field lens > On Wed, 9 Mar 2016, Rod Smallwood wrote: >> Thanks,, >> Our cam was fitted with a high grade Ziess lens that cost a fortune even then, > > Zeiss made a lot of lenses, some of which were great. > Goerz made a few of the greatest lenses ever made. > > For personal use, I'm looking for Leitz Summicron in all focal lengths, and Nikkor 105mm that was made in mid 1960s. > And, if I can ever get a 4x5 digital back, I want a Goerz Dagor. > All out of my price range. Personally I need a nice ASPH 28mm or 35mm Summicron. I have the original Nikkon 35mm f/2, one of the very first made, it?s been Ai?d, and it?s an AMAZING lens. The Goerz Dagor?s are actually pretty cheap at the moment, I?ve been thinking about them for my 8x10. I?m using a mixture of modern lenses on my 4x5. Somehow I don?t ever expect a digital 4x5 back to be affordable. I know one Photographer that has one, and it?s really only useable for reproduction work, in the studio. Keep in mind that digital backs that can cover 4x5 or larger are scanning backs. Have you considered adapting a scanner as one? I?ve seen in the past where folks have done that. Personally except for one project, I shoot B&W film when I?m shooting 4x5 or 8x10, I then process and print it myself. For the 8x10 (and hopefully eventually 11x14), I only shoot B&W, and only contact print. Zane

10 years, 1 month

OpenBSD drops support for VAX

by ian.finder＠gmail.com

A sad day indeed... :( https://twitter.com/MiodVallat/status/707636166112182272 -- Ian Finder (206) 395-MIPS ian.finder at gmail.com

10 years, 1 month

Available: Q1 Corporation Q1 Lite

by mattislind＠gmail.com

Hello! We are considering (haven't decided 100% yet) to not keep the Q1 Lite system we have. Here are some pictures: https://drive.google.com/folderview?id=0B-rp4vyPPYu1d2pRTVM5TmM0UEU&usp=sha… It is a 8080 system with PL/1 built into to ROMs. Vintage 1975-76.It has a plasma screen and comes with an orange desk with built in quad floppy drive and also a daisy wheel printer. There are also two big hard drives and a hard drive controller. Is there interest? Trade for something interesting. /Mattis

10 years, 1 month

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