test-drb

test-drb@ccmp.vtda.org

101090 discussions

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, 3 months

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, 3 months

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, 3 months

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, 3 months

test test

by jwest＠classiccmp.org

test

6 years, 3 months

Interesting device on eBay -- CDC clock generator?

by cctalk＠harlie.org

The seller thinks this may be a drum memory, but it is clearly not. My guess is that it is some kind of clock generator. Anyone recognize this? https://www.ebay.com/itm/Vintage-Mainframe-Computer-Part-Drum-Memory-Contro…

6 years, 3 months

Scientific Data Systems Cards

by ryan＠diskfutility.com

Greetings all, I have a contact that has unearth a massive cache of Scientific Data Systems modules like the one pictured here in the Houston area: <https://i.imgur.com/m0l5IiB.jpg> If anyone has a need for these modules or can identify based on that photo which SDS mainframe let me know and I'll put you in touch with the owner. Best, Ryan

6 years, 3 months

Another old phart trying to clean out the house

by luigi30＠gmail.com

I?m a collector in the Chicago area. Whereabouts are you located? I can rope up a car to grab some stuff. Got any pictures of the piles? Sent from my iPhone

6 years, 3 months

LIF filesystem under linux

by svens＠stackframe.org

Hi list, is anyone aware of a LIF filesystem implementation for Linux? I'm aware of lifutils, but i'm looking for filesystem integration either via fuse or via in-kernel module. Haven't found anything on the internet. Thanks Sven

6 years, 4 months

formatting and checking floppy disks for bad sectors

by wdegroot＠ptd.net

i read / viewes a video on ormattinf a floppy with trk 0 bad i attempted to download the suggested utility bt it returned " filenot foiud: if there is sich a util, can you sedn me the file? it is annoying to have a kiooyt go bad te next tie it is used. sometimes in minutes. i am generaly working wit oder stuss on ss retirement.

6 years, 4 months

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