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101090 discussions

Looking for DEC M7264-CB Troubleshooting Documentation

by vintagecomputersmn＠gmail.com

Hello, As part of my H11A project, I am trying to debug my M7264-CB LSI-11 CPU module. When powered on, the CPU does not respond to the Run/Halt switch either on the front panel or via the console. I found engineering schematics for the M7264 online, but I was wondering if any in depth troubleshooting material existed online (Logic probe points, debugging steps, etc...). Thank You, Gavin

7 years, 3 months

IBM 1052 keyboardless printer on eBay

by steven＠malikoff.com

Sadly, way out of my price range. I'd dearly love it though: https://www.ebay.com/itm/IBM-1052-Selectric-Keyboardless-Golf-Ball-Console-… Seems to be missing the 1052 / 2741 platen knobs unique to the printer-keyboards and I/O Selectrics BUT if anyone is interested I have almost finished the CAD model for this (measured from the 2741 platen I still have). They just need to be 3D printed off and the aluminium bosses machined and tapped: http://www.surfacezero.com/g503/data/500/IBM_1052_and_2741_platen_knob.jpg Steve.

7 years, 3 months

Looking for DEC M7264-CB Troubleshooting Documentation

by jnc＠mercury.lcs.mit.edu

> From: Mister PDP > the 'Run' light does not come on when the switch is toggled Yeah, it wouldn't come on full unless it somehow fell into a loop of some kind - very unlikely. (Does that model LSI-11 have the on-board memory? I'm too lazy to look it up! :-) And what do you have the CPU jumpered to do on power-up? (ODT, 173000, etc.) But I would expect to see a brief flash. (Note: I don't have an LSI-11 plugged in to check this, I'm going by memory - the -11/23 certainly does the brief flash; if need be, I can pull out an -11/2 and plug it in, once I figure out if they are safe in Q22 backplanes.) I'd check the power voltages, and the clocks on the CPU board, and then look at BSYNC, etc to see if there's any hint that the ODT ucode is trying to read the console registers. No activity on BSYNC -> the ucode's not running. 'Small' QBUS systems - i.e. a single backplane - are OK to run with no termination on the far end of the bus (the CPU board includes pullups for that end), that shouldn't be an issue. Noel

7 years, 3 months

Looking for DEC M7264-CB Troubleshooting Documentation

by jnc＠mercury.lcs.mit.edu

> From: Mister PDP > I was wondering if any in depth troubleshooting material existed online I am not aware of any; I would be glad to be corrected. Unlike the early gneration of UNIBUS CPU's, these generally weren't intended for internal fault analysis and repair - module swapping and replacement was the intended approach. The LSI-11 manual (EK-LSI11-TM-003) has a tiny bit of detail on how the CPU board works (pp. 4-3 - 4-13), it's probably worth reading that before diving into the CPU board internals. Things I'd check to start with - all the power voltages, and then the clocks. If those are all OK... BTW, for any serious fault analysis on these things, you'll need a 'scope/logic analyzer. > When powered on, the CPU does not respond to the Run/Halt switch either > on the front panel or via the console. When you say 'does not respond', what's the symptom? Is the console ODT not running (which could have any number of causes)? The whole system has to be more or less running for ODT to work. I'd start elsewhere - e.g. does your mounting box have the 'run' light? (It's driven by an output of the CPU card.) Does that display any activity? Time to look at e.g. BSYNC, etc to see if the CPU is trying to read/write the console registers. Noel

7 years, 3 months

PDP-11/40 available, Arizona

by derschjo＠gmail.com

I have no affiliation with the person who owns these items, I'm merely relaying information. These machines were offered to the LCM+L but we've met our 11/40 quota :). We figured someone here might be able to provide a good home, and the seller asked us to pass the offer along. Contact information is below: Email: kristina.kaur at mac.com List of items offered: DEC PDP 11/40 from approx 1973 Other associated equipment may include punch card machine (key punch), tape drive(s), free standing dot matrix printer, terminals (approx. 12). Condition of items: Very good condition. Running or close to running. Most peripherals have been offline and stored. How have these items been used and/or stored?: Running in filtered air. Desert, dry climate. Extent or weight of these items: The DEC PDP is 6-8 cabinets.

7 years, 3 months

Wanted: SCP-301, Seattle Computer Products 8086 Support Board

by ethan＠757.org

Looking for a SCP-301 S100 board, SCP 8086 Support Board. Have the CPU board. Any leads appreciated! -- : Ethan O'Toole

7 years, 3 months

Greetings

by cctalk＠gtaylor.tnetconsulting.net

On 4/28/19 6:27 PM, Ray Jewhurst wrote: > I already have a Hobbyist License.? I am just interested in > experimenting with different OSes and different versions of OSes. ACK I don't know what VAX hardware VMS 1.5 supported, what VAX hardware that Simh supports, or what the overlap is between the two. There's a reasonable chance that someone will chime in with experience. -- Grant. . . . unix || die

7 years, 3 months

RT-11 doesn't recognize my 3.5" floppy

by charlesmorris800＠centurytel.net

On 06/05/2019 23:38, John Forecast via cctalk wrote: > The release notes on bitsavers indicate that the RX33 was not supported > until RT-11 V5.04. >> On May 6, 2019, at 6:20 PM, Charles via cctalk <cctalk at classiccmp.org> >> wrote: >> >> I have installed an RQDX3 >> But, when I boot the system (with RT-11SJ V5.01), it can't see the drive >> at all. Not only was the RX33 not supported until 5.04, there's a bug in the MSCP DU driver that wasn't fixed until 5.03 (IIRC) or maybe 5.04, which means nothing on an RQDX3 can be guaranteed to work properly before that. It caused me a lot of grief, way back in 1994. See the files at http://www.dunnington.info/public/RQDX/ and particularly http://www.dunnington.info/public/RQDX/DUX.TXT if you're interested. -- Pete Pete Turnbull ========================================================================= thanks for the additional info. Will check out the links. Meanwhile, I found an RK05 image of RT-11 "5.4" on bitsavers, made an RL02 bootable -SJ image on SIMH, then copied it over to the hardware with VTserver. (I didn't have to wait for the entire 10 MB since the contents were all on the first 3 MB anyway and no bad blocks). The system booted up to a 5.04 prompt and DU0: is fully usable with 2382 blocks on a 3.5" diskette :) My TSX+ 6.50 copy also didn't have DU enabled in TSGEN.MAC so I had to uncomment that DEVDEF line and reassemble/relink. It's SLOW on my 11/23+... we're spoiled with GHz PC's and GB of RAM. Now I can use the floppy under TSX+ too. But the generic 3.5" drive in my WinXP box can't successfully emulate an 3.5" RX33 with PUTR, apparently. (Nor an RX23). I only get read/write/directory errors after several seconds of head activity even with /RX33 and /RT11 switches set. Time for more reading and maybe drive swapping/tweaking...

7 years, 3 months

VMS versions

by raywjewhurst＠gmail.com

Does anyone know if there is a comprehensive list of changes from version to version for VMS? Wikipedia's list only shows the models that were introduced and I am more interested in the evolution of features. If anyone knows a website that shows this it would be much appreciated. Thanks Ray

7 years, 3 months

RT-11 doesn't recognize my 3.5" floppy

by charlesmorris800＠centurytel.net

On 05/07/2019 11:15 AM, Douglas Taylor via cctalk wrote: > Very interesting , now that you got it to work, what can you use it for? > Will it be an exchange media with PUTR? > > Doug > > On 5/6/2019 6:20 PM, Charles via cctalk wrote: >> I have installed an RQDX3 and the M9058 distribution board in my >> 11/23+. Since I don't have a 5.25" drive yet, I hooked up a 3.5" HD >> (1.44 MB) drive from an old PC. >> After a struggle (which I documented on VCFED's DEC forum), I managed >> to get all the jumpers and cables set correctly, and now my XXDP >> diagnostics (ZRQA?? ... ZRQF??) recognize the drive as an RX33 (DU0:, >> logical drive 0 since no hard disks are attached). It passes all the >> tests, and I can INIT, DIR, and copy files to it using the limited OS >> with the XXDP suite. The LED on the RQDX3 blinks once when the drive >> is accessed. So far so good. >> Did you actually test the drive by formatting, reading and writing? >> But, when I boot the system (with RT-11SJ V5.01), it can't see the >> drive at all. Attempts to access it result in the command hanging >> indefinitely, the drive does not select, and the RQDX3 lamp flashes >> rapidly. SHOW DEV:DU does say that the handler is installed for the >> correct 172150, 154 location. However, SHOW DEV:DUn where n=[0..3] >> displays two blank lines then back to the dot prompt. >> >> Is my version of RT-11 just too old to recognize an RX-33? If so, >> what do I need to fix this? Presumably a later DU.SYS? >> Thanks for any help. Most of my experience is with PDP-8's so this is >> slow going... >> -Charles >> > RT11V5 works for me using RQDX3 and the distribution board in the BA23 box assembled as a MicroPDP-11 with RX33 and RD52 (Quantum 31mb). Never thought much about it other than to make sure the RX33 was jumpers were correct and making a dummy panel for the smaller than RX50 drive. The 11/73 system has the RQDX3 and the signal distribution board (m8058) out of BA123 to hook up RD52, RX33, RX23 and never had issues due to addressing devices under RT11. Is it possible you have a interrupt grant gap between the various boards and the RQDX? That would cause a hang. If you successful it makes using PUTR easier though RX50 works for that too just smaller. =============================================================================== Not a hardware or installation problem (once I got everything hooked up right, that is)... As another member helpfully pointed out, 5.04 is the first version of RT11 that supports RX33. I have 5.01 on my TSX+ RL02 pack. Once I booted with an RT11XM 5.04 disk, I can format, read and write the floppy :) Now I have to figure out how to upgrade to RT11SJ 5.04 or later without bombing the contents of the RL02. Remaking a pack with VTserver is a pain. Yes, the plan is to use PUTR on an old Windows box that I use with my PDP's. I'll probably use Front Panel Express to make a nice rack panel for a 3.5" and a 5.25" drive, instead of having the bare drive sit on top of the RL02 in the corporate cabinet ;)

7 years, 3 months

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