Aficionados;
I'm interested in acquiring an HP1000 A900, in any form-factor.
(http://www.hpmuseum.net/display_item.php?hw=594)
Basic need would be a chassis/backplane/PS and minimal set of
CPU/memory/HPIB-controller/terminal-IO PCA, however I'd be interested in
simply acquiring a PCA-set and I'll work the chassis/backplane/PS
separately. Even single PCAs would give me a helpful push forwards.
And I need to stick to my hobby (beer") budget.
I'm located in Maryland, USA, and pretty sure that the cost of overseas
shipping would be ghastly for a chassis. But maybe not as bad for the tower
configuration as for the rack-mount.
If I understand correctly, the CPU consists of:
12201A A900 Sequencer Card
12202A A900 Data Path Card
12203A A900 Cache Controller
12204A A900 Memory Controller
12220A 768KB RAM (Or I presume 12103D 1MB, 12221A 3 MB, or 12221B 8 MB.)
I imagine that I'll need to synthesize my own OTT "frontplane" for the
memory.
12009A HP-IB Controller
12040D Asynchronous Multiplexer interface board
Thank you for your insights, and opportunities (I hope),
paul
(offlist at pbirkel at gmail.com)
John Wilson confirmed that his program was designed to work with one floppy
and an HDD. He says strange things happen if one tries to use two floppy
drives instead... just as I found ;)
I removed the second floppy drive, dug out an old 540 MB hard drive (with
Win 95 on it) and hooked it up to the PC. Started Win95, then "Restart the
computer in MS-DOS mode", copied PUTR to the C: drive and started it.
PUTR now works perfectly, transferring files in both directions to an the
emulated RX33 (3.5" floppy). The PDP-11 can read and write those disks on
its generic 3.5" floppy "RX33", too. :)
Now I just have to figure out the PC partitions/hard drives to make using
PUTR as simple as possible.
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...
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
> 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
> 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
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.
