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Thread: Apple IIe Macintosh card now won't access the external 5.25 floppy

  1. #1
    Join Date
    Oct 2014
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    Pottstown, PA
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    209

    Default Apple IIe Macintosh card now won't access the external 5.25 floppy

    I pulled my LCII with a IIe card of the shelf and powered it up.
    It acted erratically and I knew what that meant, recap time.
    Actually long overdue, I should not have let it get to this point.
    It used to work great.

    Now after the recap, and the LCII working good again, I'm finding that the IIe card will not
    access the external floppy. "Cannot boot from.." message issued on the IIe
    screen.

    Seems like this person had the same thing:
    http://www.applefritter.com/?q=conte...ng-my-hair-out

    If anyone really knows this card, or someone with access to schematics, can
    tell me if the card has some buffers between the ASIC and the connector that
    might be changeable? The card seems to otherwise work fine so I'm suspecting
    its something external to the ASIC.

    Thanks!

  2. #2

    Default

    Has this floppy drive worked with the IIe card previously? There are two identical looking 5.25" drives for the Apple II, The one marked "Unidisk 5.25" Drive" doesn't work on the IIe card due to the missing -12v line.

    https://web.archive.org/web/20170320...om/drives.html

  3. #3

    Default

    This might be slightly left of field but possibly check your power supply connector (between the logic board and the supply itself).

    I have an LC which worked great; I then recapped it and then started having odd problems like spurious reboots and hangs. Turns out one of the contacts inside the PSU to logic board connector had partially disintegrated when I disconnected it for the recapping. It wasn't at all obvious until I started poking around and checking voltages with a multimeter (and hence wiggled the bad pin which triggered an instant reboot). Replaced the pin and it all works fine again.

    I'm not sure if the LC series is like IBM PC's where some PSU voltages are only used for very specific tasks (i.e. the -12V line might only be used on the apple IIE card but nothing else). I only thought of it due to the above post.
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  4. #4
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    Default

    Hi gents, thanks. I didn't tell quite the whole story exactly.
    When it was put on the shelf a while back, it was a fully working configuration.
    It is the correct model drive for a IIe card. Yes this exact drive used to work with the card.
    Plus I have a 2nd identical model that also does not work with the IIe card.
    Both drives work on a IIgs.

    Further, the IIe card behaves the same in another machine, a recapped LCIII.
    The problem seems to follow the card, unless both the LCII and LCIII also have the same offending problem
    which is possible but not likely.

    This is why I posed the question if there is anything replaceable on the IIe card that might be preventing the card
    from working with a drive. The drive light never comes on and never makes a sound when the IIe card should
    be booting from it.

  5. #5

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    The disk port is wired more or less directly into the IWM. No buffers. Which is why you don't want to try to hot-plug a drive. This is something I had to learn the hard way.

    http://www.typewritten.org/Projects/...3200x5va2.html

  6. #6
    Join Date
    Oct 2014
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    Pottstown, PA
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    Default

    Thanks for the link!
    My failure mode is a bit different than described there.
    I get NO drive light or motor. But I suspect the cause is the same, a
    blown IWM. I don't think it ever got hot plugged.
    The most serious abuse the IIe card saw was the cap failures on the LCII.
    But perhaps its impossible for those failures to blow the IWM.
    In any case, I think its pretty clear the card is destroyed.
    Thanks very much.

  7. #7
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
    Posts
    290

    Default

    You recapped the IIe board as well or not? Re-check the solder work and power to the drive...

  8. #8
    Join Date
    Oct 2014
    Location
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    Default

    Yes I did recap the IIe board as a matter of fact. Only two caps there, pretty straightforward.
    But, OK, I'll recheck the caps, don't know what to check on "power to the drive" other than trying the boar out again.

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