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  1. #1

    Join Date
    Jun 2020
    Posts
    36

    MB16 battery needed

    My machine won't boot up because of the CMOS battery error.
    I can't find the battery on my 1987 MB16.
    I found an empty circuit board traces for it on the motherboard, but it's clear that the battery was never there.
    I can't find the model number of the board, and I really don't want to take it out to read the back, unless I absolutely have to.




    Attached Thumbnails Attached Thumbnails IMG_2797.jpg  

  2. #2
    Registered
    Join Date
    Nov 2012
    Posts
    1223

    Re: MB16 battery needed

    The battery is inside the Dallas real-time clock module (below the PCI slots in your first photo). The module is replaced as a whole.

  3. #3

    Join Date
    Jun 2020
    Posts
    36

    Re: MB16 battery needed

    Thank you, thank you!
    I'll order this one from Amazon. It should be here in 2 days. https://www.amazon.com/Todiys-DS1288.../dp/B08LL8GL1Y





    Quote Originally Posted by CitizenOfDreams View Post
    The battery is inside the Dallas real-time clock module (below the PCI slots in your first photo). The module is replaced as a whole.

  4. #4

    Join Date
    Jun 2020
    Posts
    36

    Re: MB16 battery needed

    What kind of mouse do I need to manipulate menu in BIOS?

  5. #5
    Registered
    Join Date
    Nov 2012
    Posts
    1223

    Re: MB16 battery needed

    Quote Originally Posted by MarioMP View Post
    What kind of mouse do I need to manipulate menu in BIOS?
    Any standard COM or PS/2 mouse (same vintage as the motherboard) should work in those menus, I think.

    An early USB mouse that had a USB to PS/2 adapter with it may work (if the motherboard has the PS/2 connector).

    A modern USB mouse will definitely not work, even with the adapter.

  6. #6

    Join Date
    Jun 2020
    Posts
    36

    Re: MB16 battery needed

    I took out the motherboard because I couldn't get the DS12887A chip removed while installed. Turns out, it's soldered and just just socketed.
    Which brings up 3 questions:
    1. Can I use the battery connections next to the AMIBIOS chip to make it easier?
    2. Are there any settings I need to backup from the BIOS before I unsolder the timing/battery chip?
    3. How long does the DS12887A battery last on machines that are in a hobby shop and only turned on 1-2 a month for few hours?

    Should I try to install a socket holder/riser to make it easier next time I have to replace the DS12887A ? If I assume this one is original to the motherboard ( dated 1993ish) then I obviously won't worry about it.

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