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IBM 360? on eBay.de

by u.tagge＠gmx.de

I'm not affiliated with the seller. https://www.ebay.de/itm/seltene-Anlage-Puma-Computer-IBM-2020/202646831828?…

7 years, 4 months

More stuff looking for a good home

by bill.gunshannon＠hotmail.com

Here's a list of some more stuff if anyone is interested in making reasonable offers. Probably the last I will have before my demise when my wife will likely send everything that's left to the skip. MODULE Description QTY NUMBER M9202 UNIBUS connector 3 M9302 UNIBUS TERM 2 ADAC 1632TTL 3 ADAC 1616/32HCO 1 Plessey Peripherals 703185-100C & 701877-100 with Cable 1 Data Translation DT2769/EP057 REV F 1 Data Translation DT2769/EP057 REV J 1 Data Translation DT15150/EP075 Dual D/A Converter Module M3106 4 Line Async Mux 1 M3106 4 Line Async Mux (w/broken handle) 1 M9060 LOAD MODULE 1 M8017-AA Async Line Interface 1 M8017 Async Line Interface (w/broken handle and berg socket) 1 G7273 NPG AND BUS GRANT CONTINUITY 5 RL Disk Drive Terminators 4 MV-II Function Select / SLU Module 1 A few modules that I ecpect are rare but of limited interest. Terak 8510 Memory and Video module w/bulkhead connector 1 Terak 8510 Floppy Module w/bulkhead connector 2 Terak 8510 Floppy Module wo/bulkhead connector 2 Terak 8510 RS-232 Serial Module w/bulkhead connector 4 Terak 8510 RS-232 bulkhead connectors 3 Terak 8510 Video bulkhead connectors 2 Condition of the Terak Modules can not be verified. They were functional at the time they were removed but I no longer have any functional Teraks to test them. Shipping would be the smallest size USPS "If it fits it ships" box so you can plan accordingly. bill

7 years, 4 months

VCF PNW 2019: Photos and Survey. Please?

by couryhouse＠aol.com

a pity there are not? name? captions? ? ?for? those of? us that? do? not? travel? well to be? these in person. Great photo? collection though!? Ed# In a message dated 3/31/2019 8:46:29 AM US Mountain Standard Time, cctalk at classiccmp.org writes: One last spam from VCF PNW 2019 ... Send us your Photos!? We want to put together a shared photo album so thatpeople can see the event from different perspectives.? It's a Google Photosalbum, so if you are a Google Photos user sharing is easy.? If you are nota Google Photos user or you have concerns/questions please let me know andI'll work out an alternative. The shared album can be found at:https://photos.app.goo.gl/e2rzk4iT4aHrQUoy6 Help us make VCF events better!? If you were at the event last weekend Ihave a quick survey that I'd like you to fill out.? The survey will help usshape future events.? The survey is anonymous; we are not collecting emailaddresses unless you want to get a chance at a free t-shirt.? (And eventhen, we are only using the email address for that single purpose.) The survey link is: https://goo.gl/forms/V3DiyxwkpbIOCKn73 Direct feedback by email also works well. Thanks,Mikemichael at vcfed.org or mbbrutman at brutman.com

7 years, 4 months

Yes there is a PDP 10 front panel and Kenbak on Ebay

by jnc＠mercury.lcs.mit.edu

> From: Guy Dunphy > What I want to know is, how do front panels of historic computers so > often get separated from the rest of the computer? I suspect it probably happened a while back, before the start of the vintage computer movement; you need to look at the decisions from the perspective of back then. (As an example, back then, I was offered the complete PDP-11/45 of my old group. I was up to my neck in contemporary, important, alligators - I was on the IESG of the IETF at the time - and didn't have the time to deal with saving it and moving it to my house; so I let it go - a loss I regret terribly now.) Here's what probably happened: the machines were about to be scrapped, and saving the whole machine wasn't practical - often, in part, because those machines were _huge_. (The CPU _alone_ of a KA10 would fill an entire room of a normal house.) So, one has a limit to what one can do. So the choice is to save the front panel alone... or to save nothing. Noel

7 years, 4 months

More old stuff incoming

by sales＠elecplus.com

I talked to a recycler today, who said he told his workers to throw out 2000 Model F keyboards last week, but he doubts they did it. I also asked him about 8088, 2086, and 386 computers. He said they go straight to the grinder. I told him I will buy them. Then an HP dealer contacted me, wants to know if I buy old HP stuff. I told him Apollo and earlier. Let me know if there is something specific HP you want. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

7 years, 4 months

PDP-8: count number of set bits in a word

by kylevowen＠gmail.com

Just wondering if anyone has come up with a fast way to count the number of 1s in a word on a PDP-8. The obvious way is looping 12 times, rotating the word through the link or sign bit, incrementing a count based on the value of the link or sign. With a small lookup table, you can reduce the total number of loops by counting multiple groups of bits at a time, but this of course comes with the cost of using more memory. Any other suggestions? Much appreciated, Kyle

7 years, 4 months

PDP-8: count number of set bits in a word

by guykd＠optusnet.com.au

At 08:49 PM 5/04/2019 +0000, you wrote: >Hi Kyle, > >hat's a really interesting problem, and the government (NSA) wanted this badly and done FAST. > >they asked Seymour Cray to create a specific instruction for this and they called it 'population count' > >Anybody know the why and how it is useful? > >I am deep in matrix math books and 'classification algorithms' in statistics math, looking into electronics reliability WCCA, so this is an interesting topic. > >Randy If we're considering hardware solutions, then the best way is to build a simple I/O device, with a writeable latch for the data word, fed as address into some nonvolatile memory like a big EPROM or flash, the output of which can be read via a port. Fill the NV memory with the required lookup table (derived by some code written in anything. BASIC for lols.) So the required code is just one write and one read. See the size chart: https://en.wikipedia.org/wiki/EPROM The biggest EPROM made was ST M27C322, 32 Mbit, 2Mx16. 21 Address bits, 16 data bits, 80nS access time. http://pdf.datasheetcatalog.com/datasheet/stmicroelectronics/6184.pdf Wasteful though, since the result only needs 5 bits. For an 8 bit result, 27C4001, 512K x 8 bit, 19 Address bits. http://www-inst.eecs.berkeley.edu/~cs150/fa02/docs/M27C4001.pdf If the argument is only a 16bit word, then use a 27512. 64K x 8 bit Guy

7 years, 4 months

Yes there is a PDP 10 front panel and Kenbak on Ebay

by mark＠matlockfamily.com

Subject: Re: Yes there is a PDP 10 front panel and Kenbak on Ebay > > From: Guy Dunphy > > > What I want to know is, how do front panels of historic computers so > > often get separated from the rest of the computer? > The other thing that happened on PDP-11/70s was that if your system was maintained by DEC, the field service group would want to install the KY11-RE Remote Serial Console Control which replaced the beautiful front panel with a more or less blank panel with only a key switch. It let DEC dial in and run diagnostics, and the Blinkin' Light panel was set aside often in the collection of someone. However the blank panel still needs the bezel for a good display of it. So unfortunately, there are more console panels than bezels which often did not get salvaged at the time the PDP-11/70 was taken out of service. Mark M.

7 years, 4 months

Yes there is a PDP 10 front panel and Kenbak on Ebay

by jnc＠mercury.lcs.mit.edu

> From: Al Kossow > because it's $125 lower than the last one that sold. > https://www.ebay.com/itm/113190860596 Wow - somebody got a real deal! Looks like the seller listed it as a BiN with a low (for what it was) price; bet they're kicking themselves now, seeing what this one is going for, that they didn't go the auction route. Noel

7 years, 4 months

FTGH - Compaq laptop LTE 5280

by Richard.Sheppard＠telus.com

Worked last time powered (no guarantees), with expansion dock. Free for pickup only in Toronto, Canada. Richard Sheppard

7 years, 4 months

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