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Thread: PDP-8 Single Board using IM6100

  1. #1

    Default PDP-8 Single Board using IM6100

    The Holiday break has given me some quality time to spend on a single board computer using the IM6100 (actually Harris 6100.)

    Got the PCBs earlier this month and was finally able to get one assembled.
    Control Panel is nothing but switches and LEDs but for me was the most difficult part.

    IMG_0824.jpg IMG_0826.jpg

    I plan to post all design details on Github once I am further along.
    Also have extra boards and parts (including switches and LEDs) if anyone would be interested in the future.

    At this point it is passing the processor and extended memory maindecs.

    The serial port on the SBC serves a dual function as the KL8E compatible port and also as a debug port.
    It is very useful as a debug port since I can trace program execution and print the bus contents for every memory cycle (R/W/IOT)

    The SD card is FAT32 and contains disk images which may be assigned to either drive of a dual RX01.
    I am currently working with the RX8E maindec.
    My plan was to NOT implement the deleted data function.
    Does anyone know if this bit is actually used anywhere (besides the maindec)?

    -Bill

  2. #2
    Join Date
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  3. #3
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    Nice project!

    Dave

  4. #4

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    That is extremely cool.
    -- Lee
    If you get super-bored, try muh crappy YouTube channel: Old Computer Fun!
    Looking to Buy/Trade For (non-working is fine): Mac IIci hard drive sled and one bottom rubber foot, Multisync VGA CRTs, Decent NuBus video card, PC-era Tandy stuff, Weird Old Unix Stuff, Aesthetic Old Serial Terminals (HP and Data General in particular)

  5. #5

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    Very nice. Were the PCB your own design or did you get them from somewhere?

  6. #6

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    Thanks. I used Kicad to design the PCB.

    I originally prototyped this using wirewrap and (many) TTL ICs but had some CPLDs laying around.
    Makes PCB layout and changing the logic a much easier task.

  7. #7

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    I've never run across anything using the deleted data function. The RX floppy images around are just the sector contents.

  8. #8
    Join Date
    Oct 2011
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    Bedford, NH, USA
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    1,656

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    Excellent! Do you perhaps have any plans to make a few assembled units available to folks like me who are unable to assemble one on my own?

    smp

  9. #9

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    Quote Originally Posted by djg View Post
    I've never run across anything using the deleted data function. The RX floppy images around are just the sector contents.
    Thanks for the response.
    I agree. It hasn’t been included in any of the image files I’ve seen.
    It’s somewhat of a pain to implement so I don’t think I will.

  10. #10

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    Quote Originally Posted by smp View Post
    Excellent! Do you perhaps have any plans to make a few assembled units available to folks like me who are unable to assemble one on my own?

    smp
    Absolutely.
    I would even be willing to donate one to someone who is more familiar with the operation of a “real” PDP-8.
    Just to get some more knowledgeable input on the design.

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