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Thread: FS: Motorola MEK6800D2 6800 Single-Board Computer TESTED/WORKING

  1. #1
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    Default FS: Motorola MEK6800D2 6800 Single-Board Computer TESTED/WORKING

    link: https://www.ebay.com/itm/273207889695

    This one looks like it was essentially built and never used. Nothing has been added to the prototype area, it looks like the EXORcisor bus connection was never plugged in to a socket, and there was no additional RAM in U18/U19 sockets. I cleaned it up, removed some areas of excessive rosin flux, and brought the board up on a 5V bench supply. It draws around 1A with address/data info on the displays. Ran through the sample program in the manual, which worked fine. I added two Fairchild branded 6810 SRAMs to bring it up to a total of 512 whole bytes of memory

    Didn't test the cassette interface, I no longer have a cassette recorder kicking around.

  2. #2
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    Here's an ad for it in the August 1977 Popular Electronics. I remember those days and following the computer articles in the magazines, though it would be another seven years before I afforded a used Timex TS1000.
    -Ed
    Attached Images Attached Images

  3. #3
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    Nice, thanks for the scan! I think this one was probably picked in early 1977 from the IC datecodes -- most of them are late 1976 but a few are in the first few weeks of 1977. Unfortunately this one didn't come with any of the original Motorola documentation, I understand there's a set of coursework based around it. I learned about the 6800 through How to Program and Interface the 6800, which was a Blacksburg Group Bugbook.

  4. #4
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    You're welcome! Here's a link to the manual, doesn't seem like a course so there may be more out there:

    https://archive.org/details/bitsaver...rola68_5774527

    If you click the link to the bitsavers Motorola library on the right, you'll find a ton more, but it's all sort of mixed together which processor, year, etc.

    Wow, this guy found an unbuilt kit, and it shows the manual set that shipped with it: http://www.electronixandmore.com/ada...mek6800d2.html

    My dad worked for Motorola back in the tube days, mostly two-way radio sales. I guess that's what piqued my curiosity.

    -Ed
    Last edited by Ed in SoDak; May 11th, 2018 at 08:00 PM. Reason: added more info

  5. #5
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    Quote Originally Posted by Ed in SoDak View Post
    Wow, this guy found an unbuilt kit, and it shows the manual set that shipped with it: http://www.electronixandmore.com/ada...mek6800d2.html
    Hello! Yep, I still have it. Found it at a consignment store which had cleaned out an estate. Also got a (built) Heathkit ET-3400 trainer included with it, along with its manuals. No idea why this MEK6800D2 was never built, or why the boxes have separate addresses on them. BTW, I missed one of the manuals included in the binder containing the parts packet when I was taking those photos. Not sure if it contains the building instructions, as I haven't looked at the kit in a long time.
    -Adam

  6. #6
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