test-drb January 2020

test-drb@ccmp.vtda.org

125 participants
81 discussions

Vintage HP test gear and other stuff at Anchor Electronics...

by lbickley＠bickleywest.com

Hi Dan, I sent the same message to the Bay Area Classic list and CCTALK. Folks from the Bay Area got photos. Don't know what happened to CCTALK... Lyle -- On Wed, 29 Jan 2020 13:51:06 -0500 Dan Veeneman <dan at decodesystems.com> wrote: > Hi Lyle, > > At least on the message I received from the list there were no attached > photographs. > > > Cheers, > > Dan > > > On 1/28/2020 7:02 PM, Lyle Bickley via cctalk wrote: > > I was browsing around in the back of Anchor Electronics a couple of days > > ago and came across some clean (but dusty) vintage HP test gear - and > > several very cool large variable resistors. I've attached some pictures of > > both. > > > > BTW: Those of us in Silicon Valley are fans of Anchor - because they carry > > lots of IC's, parts, connectors, etc. Their catalog can be downloaded here: > > https://anchor-electronics.com/ > > > > If you're interested in the HP test gear or large variable resistors > > contact Alicia - for parts, contact any staff member. > > > > Note: I receive NO financial benefit from this email and my only > > relationship with Anchor is as a long time customer. Phone: (408)727-3693 > > > > Best, > > Lyle -- 73 NM6Y Bickley Consulting West Inc. https://bickleywest.com "Black holes are where God is dividing by zero"

6 years, 1 month

UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

by j_hoppe＠t-online.de

Hi Pontus, > This thread makes me very happy. > > I have a KS10 that I'm working on (quite slowly). The PSU is checked out > and working. Then console seems to work, I can deposit/examine to CRAM > and RAM. > > Next step will be to load micro code and I've been mentally preparing to > tackle an RH11 emulator for the Unibone. > > I'll buy one from Joerg as soon as the second batch is ready and me and > my KS10 will happily be guinea pigs. > > And if I can, I'll help with development. I now have UniBones ready to ship. More on PM, kind regards, Joerg

6 years, 1 month

Vintage HP test gear and other stuff at Anchor Electronics...

by lbickley＠bickleywest.com

I was browsing around in the back of Anchor Electronics a couple of days ago and came across some clean (but dusty) vintage HP test gear - and several very cool large variable resistors. I've attached some pictures of both. BTW: Those of us in Silicon Valley are fans of Anchor - because they carry lots of IC's, parts, connectors, etc. Their catalog can be downloaded here: https://anchor-electronics.com/ If you're interested in the HP test gear or large variable resistors contact Alicia - for parts, contact any staff member. Note: I receive NO financial benefit from this email and my only relationship with Anchor is as a long time customer. Phone: (408)727-3693 Best, Lyle -- 73 NM6Y Bickley Consulting West Inc. https://bickleywest.com "Black holes are where God is dividing by zero"

6 years, 1 month

IBM BSC CRC?

by mattislind＠gmail.com

Hello IBM BSC Experts! I am trying to figure out the CRC algorithm used by IBM BSC. I have tried a lot of different settings in crcreveng but not getting a match. I am pretty convinced that the CRC-16 used by IBM was 16 15 2 x + x + x + 1 This would give the polynomial 8005. Anyone against this statement? But what was the initial value? I have two actual messages from equipment employing IBM BSC: 32016CD90240404070032688 and 32016CD90240C84050030D28 >From this document ( http://bitsavers.trailing-edge.com/pdf/ibm/datacomm/GA27-3004-2_General_Inf… ) I get that the CRC calculation is reset on SOH (01h) or STX (02h) and accumulates until and including the ETX (03h). (excluding any SYN (32h) characters). I have tried crcreveng back and forth and I am not getting the CRC bytes right. I think I have tried most things, different bit order, different initial values. But nothing. I also tried the mode in crcreveng where it searches for matches but it always says "no models found". Maybe I am doing something wrong when using crcreveng? Any clues? Surely there are someone out there that has been around for some time and knows this, right? On the topic of crc reveng I tried to verify how it works by using some kind of known value: This article https://stackoverflow.com/questions/23638939/crc-16-ibm-reverse-lookup-in-c has a specific example where a certain data in (75h) with initial value 90f1h gives output 6390h. I tried to get crc reveng to do the same, but failed. There has to be some option I simply do not understand. I tried most combinations. /Mattis

6 years, 1 month

recovering data from old hard drive

by elson＠pico-systems.com

I have dug out an old SCSI hard drive from 1997 that may have some interesting stuff, most especially the source code for the SGI Iris flight sim demo. I have a Linux system with an Adaptec 2940 (aic7880) that has two connectors on it. It SEEMS from some probing that the 50-pin IDC connector on the top of the board is single-ended SCSI (it seems to have mostly grounds on one row of pins). Same for the drive, which is a Quantum ProDrive LPS. The drive spins up and does some seeking right after power-on, so it sounds like it is working. But, I can't seem to find that the drive is being recognized by the aic7xxx driver. So, looking at /proc/scsi/aic7xxx/## I see the device addresses all show just the negotiation settings, and /proc/scsi/scsi just shows my SATA devices but not the real SCSI ones. I have the right cable to plug my old HP scanner into the mounting plate Honda connector, and it shows up fine. I could try getting a Honda to IDC-50 cable, but I thought the IDC50 connector on the board edge OUGHT to work. Does anybody have any suggestions on what to try? Thanks, Jon

6 years, 1 month

KE11-A stuff

by jnc＠mercury.lcs.mit.edu

So I've decided to try and build up a KE11-A Extended Arithmetic Element. I have most of the boards (although I*m missing a M234 Register dual-width board, if anyone has one). The main thing I'm missing at this point is a backplane. I do have a BB11 (which came out of an old piece of data acquisition gear, or something like that) which I can wire up, but before I start on that I figured I'd ask and see if anyone has one they would be willing to part with. (Hah-hah!) If not, if someone does have one, even if you want to hang onto it, I'd really appreciate good photos of the pin side of the backplane, so I have a more detailed idea (than just the prints) on how the wiring goes. And speaking of the prints, although there are a scanned set online, they are pretty low-res, and some parts (e.g. the wire list, which was typical line printer output) are hard to read as a result. So a new scan would be really, really appreciated. Thanks (I hope)! Noel

6 years, 1 month

Unidentified peripheral in Tektronix PDP-11/20 system

by steven＠malikoff.com

I was idly browsing some old electronics magazines on archive.org and saw this Tektronix testing system from 1972 that clearly has an 11/20 and TU-56. Just curious as to what the piece of gear is sandwiched between the two. It sort of looks like a paper tape reader, but for the two white buttons or whatever they are at the lower right and the white bit at top right. It seems to be in a DEC bezel(?) It doesn't seem to match the bespoke Tek gear at right which looks quite different. I'm guessing it really is just a paper tape reader. http://www.surfacezero.com/g503/data/4173/Tektronix_S-3260_automated_test_s… Thanks in advance. Steve

6 years, 1 month

Assorted PCB ID?

by coryheisterkamp＠gmail.com

I found myself cleaning up the shop recently, and came across some vintage circuit boards I had stashed away 20 years ago. I?m curious if anyone can shed some light on what systems they originally went to. Here?s a link to the album?more info below. https://photos.app.goo.gl/amRmm5P8375js4o1A <https://photos.app.goo.gl/amRmm5P8375js4o1A> #1 Marked Aeronutronic Address Buffer D700909. Socketed transistors and test points along leading edge with ID tab visible when installed. #2 No name or brand marking, sides have cast aluminum rails and a clever locking mechanism. Transistors are 2N-167 in clips. #3 Marked 'Power Supply 1534 8253' 5-1-70, single-sided with edge connector. #4 Large card 11?x10?, Burroughs logo. Date stamp of Jun 1972. Not sure if someone has robbed some of the ICs or if this was optional population. #5 Small 3x4 card, single-sided but every hole has an unusual pressed-in and flow-soldered barrel. Relays are marked Blue Bead 26.5V. Looks early Japanese. 4 corner brackets have threads swaged-in for mounting. Thanks, Cory

6 years, 1 month

from Discord

by aek＠bitsavers.org

9:10 PM jwest and now the image of the classiccmp mailing list server should be back to where it was the day of the failure. As per above, no data lost except a handfull asking if the server was up.

6 years, 1 month

test test

by jwest＠classiccmp.org

test

6 years, 1 month

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test-drb January 2020