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Thread: Juko nest n3

  1. #1
    Join Date
    Dec 2018
    Location
    St. Petersburg, Russia
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    Default Juko nest n3

    Greetings.
    I need help with this board. It had no CPU (I've installed 12MHz V30) and a strange BIOS, that doesn't look like one for 8086. Both halves are almost identical, and I think that's why this board appears to be dead (no video, no speaker beeps). I've found several photos of this board with v2.01 NEST BIOS, but no luck finding any ROM images for 8086 Juko.
    I've attached my ROM dumps, just in case, in raw and intel hex formats.
    Juko NEST N3.jpg
    Juko 1_07.zip

  2. #2

    Default

    Have you tried a V20 ?
    Those BIOS chips definitely aren't odd/even, so it's likely the bus is 8-bit, just like on those common "Juko Super Turbo" boards.
    Also, it could use some RAM chips...

  3. #3
    Join Date
    Jan 2007
    Location
    Pacific Northwest, USA
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    Default

    From the ROM contents, I agree that it's most likely just an 8088/V20 board.

  4. #4

    Default

    I did some search, and I'm inclined to believe it really is 8086/V30.
    See this topic - https://www.vogons.org/viewtopic.php?f=46&t=60077

    Edit: also, that famous V'ger XT is based on that board - https://sites.google.com/site/misterzeropage/
    Maybe the owner can provide the correct BIOS?
    Last edited by Xacalite; December 1st, 2018 at 09:36 AM.

  5. #5
    Join Date
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    Default

    Worst case--if this uses a "split" BIOS configuration, you could just take a vanilla XT clone BIOS and divide it yourself. That might be enough to get you booted.

  6. #6
    Join Date
    Dec 2018
    Location
    St. Petersburg, Russia
    Posts
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    Default

    This board is definitely 8086/V30 version - I've checked how data lines interconnect on ROM and RAM chips - the data bus is 16 bit.
    I'll try splitting the original BIOS, but I want latest version if possible - working with UV ERPOM is not that easy.
    I know about Anonymous Coward's XT, but I haven't found way to contact him.

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