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Thread: My First PDP-11 Build project!

  1. #11
    Join Date
    Mar 2008
    Location
    Westchester County, NY
    Posts
    1,244

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    And here finally now in presentable condition is the 8/a from the haul. Everything has been cleaned and I repainted the rack and RX01 panel. The RX01 had been shoved in and propped up on Styrofoam blocks, but now is on ball bearing slides. I also added the 2U filler at the bottom, repainted to match.

    http://www.vcfed.org/forum/album.php...chmentid=45454

    The VT52 was not from the haul but from my childhood. For the right 1978 period look, I thought it should go with this 8/a. Can you believe that 1978 was 40 years ago? I am getting old.

    My next steps will be to dress all the cabling properly, run diagnostics, and maybe now try Kyle's serialdisk.

    Lou

  2. Default

    Beautious! Nice work, Lou! How does the insides look? Any before and after pictures? hihi.

    I had written a whole lengthy post on load testing the power supply for one of the -11's but I lost it all in a forum hiccup. I haven't had the motivation to redo the post. One day.

  3. #13

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    Looks very nice. I have enough parts to build an 8/a, but no spare time yet.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  4. #14
    Join Date
    Mar 2008
    Location
    Westchester County, NY
    Posts
    1,244

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    Yesterday we cabled up the 8/a after the cleaning and repainting. It had been set up for a 20mA TTY connection, so I had to make a new RS232 cable. Amazingly everything worked perfectly. We booted OS8 from RX01 and I proceeded to run DHKMA on the core memory. It all passed too (http://www.vcfed.org/forum/album.php...chmentid=45492). It has the 158/159 boot roms and I have the switches set for the RX01 strap. I like the boot roms in my other 8/a better. On power up, it displays 0123 and then waits for any key before booting from the floppy. I'm not sure what the rom numbers are for that set are.

    Here is a photo in the front with the upper cover removed: http://www.vcfed.org/forum/album.php...chmentid=45493 . Nothing exciting here, but it is clean. I completely disassembled the chassis (backplane removed, fans removed, etc.) to remove all filth. In another thread I will post on my work to rehabilitate all the broken latch brackets. The rear view is equally unimpressive: http://www.vcfed.org/forum/album.php...chmentid=45491

    Operating the machine without a programmer's panel can be a little unsettling. You never know if it is actually doing something or not.

    Eventual next steps will be to add another M8650/5 and try SerialDisk. I do have an M8319 KL8A which can be set to start at 40/41 but 9600 baud will be painful. I am also thinking that a PI Zero W would make an excellent server. I read that Jack has a PI setup as a server and need to look into this a bit. There are some other hardware projects I need to work on first though.

    Lou

  5. #15

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    We run serialdisk on the PDP-12 at the RICM at 9600 baud, and it works fine. Probably as fast as the RX01 because there is no seek time.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

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