Kaypro Clock Chip - CP/M

This is a discussion on Kaypro Clock Chip - CP/M ; What was the clock chip used in the Advent and Kenmore real time clock addon for the 83 series Kaypro machines? I might as well add this the the RAM drive board. Don...

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Thread: Kaypro Clock Chip

  1. Kaypro Clock Chip

    What was the clock chip used in the Advent and Kenmore real time clock
    addon for the 83 series Kaypro machines? I might as well add this the
    the RAM drive board.

    Don


  2. Re: Kaypro Clock Chip

    "Don" wrote:

    >What was the clock chip used in the Advent and Kenmore real time clock
    >addon for the 83 series Kaypro machines? I might as well add this the
    >the RAM drive board.
    >

    I don't remember the exact
    number, but I'm pretty sure it
    was a National Semiconductor
    chip in a wide DIP package and
    pretty popular back in the day
    -- I think some of the early
    PC and XT clones had them too.




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  3. Re: Kaypro Clock Chip

    Found it. It's the same chip used in the 84 series systems.

    Don


  4. Re: Kaypro Clock Chip

    "Don" wrote:

    >Found it. It's the same chip used in the 84 series systems.
    >

    Yup, that too! :-)



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  5. Re: Kaypro Clock Chip

    On 15 Feb 2006 09:52:50 -0800, "Don" wrote:

    >What was the clock chip used in the Advent and Kenmore real time clock
    >addon for the 83 series Kaypro machines? I might as well add this the
    >the RAM drive board.
    >
    >Don



    I believe the Kenmore board was based on National MM58167.

    Datasheet may be found at:

    http://pdf1.alldatasheet.com/datashe...C/MM58167.html

    On the 84 series machines a PIO was used to interface to real time
    clock and built in modem. Maybe this was done to save address space
    for both devices?

    Presumably with address decode logic, one could connect MM58167
    directly to data bus.


    Brian



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