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Type: Posts; User: Mal

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    QBUS Card Reader Controllers

    I am aware of the CR11 (M8290/M8291) controllers for the UNIBUS.

    What card reader controllers were available for QBUS?

    The only one I am aware of is the MDB MLSI-CR11. I have one of those...
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    It turns out that this cable seems to have been...

    It turns out that this cable seems to have been wired to suit the DRV11, or a compatible such as the MDB MLSI-DRV-11C.

    Perhaps the DRV11 was able to be configured to be software compatible with...
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    Thanks for pointing me to the LS8-E. It turns...

    Thanks for pointing me to the LS8-E. It turns out that the LS8-E (M8342) and LS11/LP11/LA11 (M7258) are wired the same, so far as D1-D7, STB and ACK are concerned. So this cable doesn't suit the...
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    Parallel printer cable for PDP-11

    I have a couple of cables with identical wiring that appear to be for a parallel printer.

    They have a 40-pin Berg connector on one end and a Centronics-style d-shell connector on the other end.
    ...
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    PDP-8/e earth leakage problem

    I recently moved house and found that my PDP-8/e triggered the RCD (Residual Current Device) in the switchboard of my “new” (15 year old) home.

    The problem was quickly identified to be the Sprague...
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    Hi smp, I have a page with some notes about...

    Hi smp,

    I have a page with some notes about how to use a SCSI2SD with a QBUS PDP-11. My page doesn't really deal with the physical interface or the configuration of the SCSI2SD board, but it does...
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    Great to hear that you have the system up and...

    Great to hear that you have the system up and running. I'm a big fan of AK6DN's tu58em also. It's my tool of choice for bringing up a QBUS system, building boot disks on real hardware, etc. At...
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    You are welcome to try this KiCad template ->...

    You are welcome to try this KiCad template -> http://avitech.com.au/?page_id=3319

    I haven't yet used it for a Qbus or Unibus project, but it worked well for a recent Omnibus prototype.
  9. There are so many possibilities here with FPGAs...

    There are so many possibilities here with FPGAs and CPLDs....

    I have a recently built prototype that aims to implement 32Kx8 RAM with just 3 chips. It is just a re-implementation of Steve...
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    I have the Plessey controller. I purchased it a...

    I have the Plessey controller. I purchased it a few years ago. It's untested and currently in the U.S. Roland - if you are interested in it, just send me a PM.
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    Well done Gary. This is excellent. I'd like to...

    Well done Gary. This is excellent.

    I'd like to register my interest for 2 x kits (including 2 x PCBs), when available.

    Are you able to post a few notes documenting the steps taken (tools used...
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    Terry - thanks for the explanation. Is anyone...

    Terry - thanks for the explanation.

    Is anyone interested in these 25+ cartridges (or some of them)?

    Free of charge (you just pay for packing and shipping). These are in Melbourne, Australia....
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    Unusual RL disk packs

    Just wondering if anyone can help me identify an RL disk cartridge please.

    The cartridges are marked "Control Data 848-12".

    When I try to LOAD these on a known good RL01 system (QBUS with RLV12...
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    On a related note, I thought I'd share that my...

    On a related note, I thought I'd share that my VAX-11/780 and 11/785 (with various external disk and tape drives) are passing into the hands of what I consider to a very deserving recipient. He's a...
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    Recently scanned RQDX Field Service Tech Tips

    Going through some boxes of documentation, I found some rather obscure DEC "Field Service Tech Tips" (and DEC uNote #043) that relate to the RQDX controllers.

    uNote #043 is already online...
  16. Chris - Well done on getting the TBC board going....

    Chris - Well done on getting the TBC board going.



    I suspect this is because DEC allocates only a 256-word window (173000-173776) for boot ROMs. If the ROMS were to extend past this window,...
  17. Problem installing "FTP and Telnet Package for Small Systems" for RT-11

    I'm attempting to install the Alan Baldwin (Kent State University) FTP and Telnet Package for Small Systems for RT-11 from the supplied TCPIPM.DSK logical disk.

    My target operating system is RT-11...
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    Hi Peter. I can see a couple of RQDX3's on eBay...

    Hi Peter. I can see a couple of RQDX3's on eBay right now for around $US60 plus shipping. I don't think that's unreasonable. I've seen them for less from time to time.

    I assume you know that...
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    I managed to find and scan the manual for the...

    I managed to find and scan the manual for the this board. I've posted a copy of the manuals, a picture of the PCB, and a ROM dump (taken from another TBC board) here ->...
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    If you don't mind paying shipping from Australia...

    If you don't mind paying shipping from Australia (perhaps $30-$40) and don't mind some non-DEC weirdness, I'm happy to donate an un-tested General Robotics TBC board, as pictured here ->...
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    I see you have already solved this, but if you...

    I see you have already solved this, but if you end up wanting to use an ATX power supply, I have a write-up on how to connect an ATX power supply to a QBUS backplane. It uses an Arduino to control...
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    I have some detailed instructions for creating a...

    I have some detailed instructions for creating a bootable RX50 RT11 disk using PUTR that might help -> http://avitech.com.au/?page_id=645#background

    Another option of course is to boot your 11/73...
  23. Problem reading binary data from CR11 card reader

    I've been messing around with reading punched cards from a CR11 under SIMH on a PDP-11/04 running RT-11 V5.3.

    With the help of the card-file translation tools written by Doug Jones, I'm able to...
  24. I've attached a pic of the markings on the 2708...

    I've attached a pic of the markings on the 2708 EPROM installed at location E133 on my M8433. Mine also includes the marking "040B7". The text adjacent to that marking (7919) is presumably the date...
  25. Thread: Nec d5126

    by Mal
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    I don't have any experience with the D5126....

    I don't have any experience with the D5126. However a quick google search indicates that it has 615 cylinders, 4 heads, 17 sectors-per-track. That's the same as a DEC RD31 (which in fact is a Seagate...
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