test-drb

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101090 discussions

by jules.richardson99＠gmail.com

Hey all, I bumped into someone who has some early (mid 1970 on some of the photos I've seen) PDP-11 bits - front panel and a handful of boards (the backplane, PSU, rack, peripherals etc. are long gone). The front panel's branded as "Industrial 11" though, which isn't something I've seen or heard of before. Address bus is 16 bits wide, and aside from the branding, the style appears to be the same as an 11/05 or 11/10. Were there any differences to the system internally though, or in the standard set of boards fitted, or was the "industrial" aspect purely a marketing exercise? cheers Jules

7 years, 2 months

IBM lifting tool

by evanlinwood＠hotmail.com

> Their closest current product looks like the Genie Load Lifter. I saw the name also but didn't think to search :) - some great looking units there.

7 years, 2 months

IBM lifting tool

by evanlinwood＠hotmail.com

> I bodged together my PDP-Lifter that's a nice piece of bodging!

7 years, 2 months

M7264 Troubleshooting

by jnc＠mercury.lcs.mit.edu

Hi, sorry about the delayed reply; been dealing with this: http://ana-3.lcs.mit.edu/~jnc/jpg/backoak/WholeTreeS.jpg The cranes arrive tomorrow... > I took a look at all the lines you mentioned. BDAL3-13, BDIN, BSYNC, and > BBS7 are all active and jump around in some manner. Hmm. Well, that shoots down the simplest theory; that a CPU BDAL (or perhaps BDIN) driver (technically, a transceiver) chip is bad; if you're seeing any activity at all on a line, the driver must be working. So, either both console cards have an issue, or something more complex is going on. Here are some pictures to show you what you should be seeing, and what I'm seeing with an LSI-11 with no console card. First, normal operation: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/BSYN-BDAL_OK.jpg The top trace is BSYNC, the bottom BDAL10 (which should be asserted for 0177560, the console CSR's address; it's the 02000 bit). The timebase on this one is 1 usec per division. As you can see, it's in a tight loop reading that register. The QBUS spec shows that for a DATI cycle, the DAL lines are set up before BSYNC is asserted (falling edge here, since the bus lines are inverted). BDA10 is indeed asserted (low) when that happens; shortly after it goes back to 0 (high) so that device can put its data out on those lines. It stays high, so that bit in the CSR must be 0. OK, now a picture of the bus with no console card: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/BSYN-BDAL_NoCon.jpg It's a bit hard to interpret what's going on here (note that the timebase is much larger - 5 usec). The long assertion of BSYNC is undoubtly the CPU trying to get the console CSR to respond, and eventually timing out. Not sure what the short assertion following it is - without looking at the ucode for the ODT, there's no way to know what the CPU's doing. Even harder to understand is what the BDAL line is doing. It looks like it's un-asserted (0, i.e. +3V) on the falling (electrically - rising, logically) edge of BSYN (which would be incorrect - see above). And then it hops around while BSYNC is asserted, which makes no sense at all to me. At this point, my best guess at the most likely cause of your problem (given the 'all the lines are doing stuff') is that both console cards have issues. Tomorrow, when I'm not outside, I'll try and look at some other BDAL lines and see if they are doing the same thing with no console card in. Noel

7 years, 2 months

looking for an old IBM knob from a 609 calculator panel

by bobalan＠sbcglobal.net

A long shot I know, but I'm looking for an IBM knob that's missing from a 609 calculator panel I have. Photos can be seen here: http://dvq.com/ibm/ibm-609-pnl1.JPG http://dvq.com/ibm/ibm-609-pnl4.JPG http://dvq.com/ibm/ibm-609-pnl5.JPG I have no idea if the knob was made by IBM or was a common knob of the times. Thanks, Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org

7 years, 2 months

by couryhouse＠aol.com

trying to ID early core stacks from GE 200 series ( like for dartmouth basic machine) or or ERMA. any old times have close up docs or part numbers? I may have found the lost treasure... we? have a? ?2 each 21 inch? or? ?so? wide? thing? ?with 2? monster ass? stacks? mounted in each one.. one is? intact? and? dirty? but? ? ?intact! ?the other? ?stacks? and? weird other things mounted to metal? frame? work are there? but? ? ?some? stiff is? just? hanging? off it unit? ?2? might? be? subdivided? and shared .? ? I? have never seen? GE? core? that? was? this? large...... Metal? ?frame? has? log? ?GE? part? number? ? each? stack? has? ?one? ?too the? game is? afoot! if? not? solved? rather? ?quickly? they? return to the? warehouse. thanks? ed sharpe? archivist? for smecc

7 years, 2 months

Modern BLISS compiler

by lproven＠gmail.com

This just came up on Fess Bouc. I did not know that it existed. It's an LLVM-backed modern compiler for BLISS. https://madisongh.github.io/blissc/ -- Liam Proven - Profile: https://about.me/liamproven Email: lproven at cix.co.uk - Google Mail/Hangouts/Plus: lproven at gmail.com Twitter/Facebook/Flickr: lproven - Skype/LinkedIn: liamproven UK: +44 7939-087884 - ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053

7 years, 2 months

11/93 Rebuild - Project resumed - PSU replaced

by rodsmallwood52＠btinternet.com

11/93 Rebuild - Project resumed - PSU replaced Rod --

7 years, 2 months

Abandoned FACOM system in Italy?

by shadoooo＠gmail.com

Hello, do you know the people who made the video? I think the factory is the Satilai in Saronno. Andrea

7 years, 2 months

M7264 Troubleshooting

by vintagecomputersmn＠gmail.com

I took a look at all the lines you mentioned. BDAL3-13, BDIN, BSYNC, and BBS7 are all active and jump around in some manner. BRPLY is still the only line that does not have any activity on it. None of the BDAL lines seem shorted to ground or to each other. My DLV11-J is configured to essentially factory settings (J3 set as console, 8 bits no parity) except for the fact that J3 is at 9.6k baud instead of 300, the address jumpers are exactly the same as the one you provided. On Sun, May 26, 2019 at 6:35 PM Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote: > Hey, I owe you replies to about a zillion emails; been busy, I'll > try and get to them tomorrow. A few quick things: > > > > My M8043 (DLV11-J) just arrived today. > > Here are the jumpers on mine, which I just pulled from a working system, > so you can compare and make sure you have them correct: > > A5 L > A9 L > A12 C > A10 C > A11 C > A8 C > C2 C > C1 C > > Key: L = jumper from left post to right (component side up, gold pads > at bottom) > C = jumper from center post to right > > A6 I > A7 R > > I = Insert, R = Remove > > B-X-H X-H > > I have left out the vectors jumpers, since ODT doesn't use interrupts, and > the line config jumpers (their setting shouldn't have any effect on the > ability of the board to respond to ODT). > > > > I have a hard time imagining that both my M8017 and my M8043 are > > bad, but it could still be possible. > > Well, I did mention that the CPU board could have a fault causing it to > put out a bad address for the console; the other likely cause is that > both consoles are bad. Not sure which is the most likely. > > The blunt hammer debugging technique is to look at the address being put > out on the bus; you'll need to look at BDAL3-12 and BBS7 (sort of an AND > of all the high address bits, so devices should work on Q16, Q18 and Q22; > in fact, the manual says that device should look at BBS7, and hot BDA13 > and up). Best to use a 'scope so you can see what the waveforms look like. > This is slow and painful, but will allow precise, definitive diagnosis. > > If the address is good, look also at BDIN. If that's toggling, it's the > consoles. Otherwise, CPU issue,which we'll delve into once the data > points definitively. > > Noel >

7 years, 2 months

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