System version on Late 2009 Macs

Discussion in 'Mac' started by David Empson, Oct 24, 2009.

  1. David Empson

    David Empson Guest

    I saw one of the new 27" iMacs (3.06 GHz Core 2 Duo model) in a local
    dealer today, and made a note of its system version and build number, in
    case anyone is curious.

    It came with Mac OS X 10.6.1, build 10A2155.

    Slightly surprising that it is "10A" not "10B" - that means the system
    was based on the retail 10.6 with modifications to support the latest
    models, despite being called "10.6.1".

    The "2155" in the build number indicates it is a custom build (implied
    by a four digit number with '2' in front).

    For comparison, retail 10.6 is build 10A432 and a retail 10.6 updated to
    10.6.1 is 10B504.

    It is not clear whether a 10.6 system on another computer updated to
    10.6.1 will also work on these new models. Generally speaking, the
    higher letter in the build number should mean that it supports models
    which came with a build that had a lower letter, but 10.6.1 came out a
    few weeks before these models, so it might not contain all the necessary
    support files (or could have older versions).

    There won't be any such ambiguity with 10.6.2. It will definitely
    include full support for the late 2009 models (when installed on an
    older model).
    David Empson, Oct 24, 2009
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  2. David Empson

    Greg Buchner Guest

    I didn't check the OS X version number of my Mini that arrived
    yesterday, but I do know that the updater did download and install
    10.6.1 (10B504).

    I imagine that is because there was very little change to the Mini other
    than processor speed and installed options.

    Greg B.
    Greg Buchner, Oct 24, 2009
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  3. David Empson

    David Empson Guest

    Agreed. The hardware was identical apart from those deatils, as far as I
    can see from published specs on the Apple store.
    David Empson, Oct 25, 2009
  4. David Empson

    David Empson Guest

    Your comment doesn't make any sense. Yes, I did know that 10.6.x is Snow

    I was talking about the specific version of 10.6.x which came on the
    latest Mac models (since Apple hasn't yet updated their published list
    to include the late 2009 models).

    The main points of interest being that the latest iMac came with a
    custom build of 10.6.1, not the same build as other machines running
    10.6.1, and it had the letter 'A' in the build number (unusual, as the
    general release of 10.6.1 has a 'B' in that position).
    David Empson, Oct 30, 2009
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