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  • Apple //e (white keys) motherboard revision

    From KP@kjpmail@gmail.com to comp.sys.apple2 on Wed Jan 31 15:43:27 2024
    From Newsgroup: comp.sys.apple2

    Is there a way (other than, for example, trying to play a DHR game like Bad Dudes on it) to detect whether my white-keys //e is a Rev. A or Rev. B? It is enhanced, for what that is or is not worth.
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  • From D Finnigan@dog_cow@macgui.com to comp.sys.apple2 on Thu Feb 1 13:52:34 2024
    From Newsgroup: comp.sys.apple2

    KP wrote:
    Is there a way (other than, for example, trying to play a DHR game like
    Bad
    Dudes on it) to detect whether my white-keys //e is a Rev. A or Rev. B?
    It
    is enhanced, for what that is or is not worth.


    The revision letter is marked on the motherboard. Read the part number
    printed to the left of the green copyright notice. Starts with 820...
    --
    ]DF$
    The New Apple II User's Guide:
    https://macgui.com/newa2guide/

    --- Synchronet 3.20a-Linux NewsLink 1.114
  • From Brian Patrie@bpatrie@bellsouth.spamisicky.net to comp.sys.apple2 on Sat Feb 3 18:32:37 2024
    From Newsgroup: comp.sys.apple2

    KP wrote:
    Is there a way (other than, for example, trying to play a DHR game
    like Bad Dudes on it) to detect whether my white-keys //e is a Rev. A
    or Rev. B? It is enhanced, for what that is or is not worth.

    I think it's possible to upgrade a Rev A IIe to enhanced, so
    enhancedness not a foolproof indicator that it's DGR,DHGR capable.

    To test it: from freshly powered on, enter:

    PR#3
    HGR
    POKE 49246,0

    If it's DHGR capable, you should end up with memory garbage from auxmem interleaved with black vertical bars from mainmem.
    --- Synchronet 3.20a-Linux NewsLink 1.114
  • From Mitchell Spector@mitch2gs@hotmail.com to comp.sys.apple2 on Sat Feb 10 05:36:02 2024
    From Newsgroup: comp.sys.apple2

    KP <kjpmail@gmail.com> wrote:

    Is there a way (other than, for example, trying to play a DHR game like Bad Dudes on it) to detect whether my white-keys //e is a Rev. A or Rev. B? It is enhanced, for what that is or is not worth.

    The most fool proof method is to look at the motherboard itself.
    Examine the part number at the top-center, above the card slots.

    You will see 820-0064-A for the revision 'A', and 820-0064-B
    for the revision 'B'. Note there was a third revision that used the
    'A' label again, and that was 820-0087-A, but is functionally a 'B'
    revision board. iI is notable for having a 1984 copyright date
    and the Enhanced chip part numbers silked screen on the board.

    Of course the motherboard used in the Platinum Apple IIe is
    also functionally a revision B board. I don't know the part number
    off the top of my head, but it is visibly different as there are far
    fewer chips present (firmware combined into "CD" ROM, and
    just a pair of 64Kx4 DRAMs. Also likely a 1986 copyright date).

    I believe Apple recommended against installing the Enhanced
    chipset in rev 'A' boards, but it would still work. You just would not
    have the capability to use Double-Lo/Hi-Res graphics or have
    the special video data signal accessible through slot-7.

    Mitchell Spector
    --- Synchronet 3.20a-Linux NewsLink 1.114