DEC disc pack inspection unit on eBay
There's a mis-categorized disk pack inspection unit up on eBay. Might be of use to someone. https://www.ebay.com/itm/Early-Digital-Equiment-Corp-DEC-Portable-Briefcase-Paper-Tape-Reader-Punch/303149714641?hash=item4695218cd1:g:ks8AAOSwEVZc1PQo Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org
Bug in PUTR?
I'm having trouble copying files from my PDP-11 (RT-11 format) into an old Windows box using the last version of PUTR. It appears that WinXP does strange things with the hardware (3.5" 1.44 MB drives aren't actually RX33's although my RQDX3 controller believes they are). So I made an MS-DOS boot disk and run PUTR directly on MS-DOS (instead of the WinXP DOS window). Unfortunately MS-DOS 6.22 can't recognize my hard drive since it's NTFS-formatted, so it all has to be done in floppies. Both WinXP and MS-DOS know that A: and B: are two separate drives. Likewise the BIOS settings. I can copy files in DOS and Windows back and forth between the two drives. And I can MOUNT B: as a logical device DU0: (or without a logical device name, as B: /RX33 /RT11), and read its directory. But when I try to copy a file from A: to DU0:, the B: drive light flashes briefly, and then PUTR tries to write over the A: drive (blocked by the write- protect tab once I wised up)! So how on earth can the BIOS, MS-DOS and WinXP all know that A: and B: are two separate drives, but PUTR tries to write to A: even though the command is to write B: ?? I also tried switching the PUTR disk into B: and the RT-11 formatted disk to drive A:. Same problem (tries to write over the source disk which is now B: even though the output filespec is clearly A). I had a look at the code but nothing's leaping out at me. Although it's been many years since I wrote any 8086 code...
Re: Looking for DEC M7264-CB Troubleshooting Documentation
On 5/9/19 9:57 AM, Mister PDP via cctalk wrote: > I was wondering if any in depth > troubleshooting material existed I'd start with the description in WD1600 chip set docs to see if the basic microprocesor is running http://bitsavers.org/pdf/westernDigital/MCP-1600/MCP-1600_Users_Manual_Oct77.pdf
Re: Looking for DEC M7264-CB Troubleshooting Documentation
> 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
Re: Looking for DEC M7264-CB Troubleshooting Documentation
I was referring to both the ODT prompt and the run light. I get nothing on the console and the “Run” light does not come on when the switch is toggled. On Thu, May 9, 2019 at 12:41 PM Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > > 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 >
Re: Looking for DEC M7264-CB Troubleshooting Documentation
> 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
Re: Looking for DEC M7264-CB Troubleshooting Documentation
On 05/09/2019 11:57 AM, Mister PDP via cctalk wrote: 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...). Well, first thing to check is that the bus is properly terminated, and that memory requests are being properly acknowledged. Jon
Re: PDP-11/40 available, Arizona
As I said, I'm merely relaying information: Contact information for the owner is in my original e-mail. On Thu, May 9, 2019 at 10:22 AM Eduardo Cruz wrote: > Im interested. Thx > > Sent from my iPhone > > > On 9 May 2019, at 19:14, Josh Dersch via cctalk > wrote: > > > > 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.k...@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. >
Re: PDP-11/40 available, Arizona
Im interested. Thx Sent from my iPhone > On 9 May 2019, at 19:14, Josh Dersch via cctalk wrote: > > 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.k...@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.
PDP-11/40 available, Arizona
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.k...@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.
Looking for DEC M7264-CB Troubleshooting Documentation
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
Wanted: SCP-301, Seattle Computer Products 8086 Support Board
Looking for a SCP-301 S100 board, SCP 8086 Support Board. Have the CPU board. Any leads appreciated! -- : Ethan O'Toole
