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  1. Important Information

    1. The 68kMLA Forum Rules   (10254 visits to this link)

      To quote vintage Apple manuals: "Read Me First!"

  2. Community Connections

    1. General 68kMLA News & Stuff

      What's going down in the barracks.

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    2. Conquests

      Discuss your latest vintage Mac finds!

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    3. Trading Post

      Feel free to trade all of your Mac goodies here with all honest intentions. The website provider assumes NO liability, so buyer beware! Please see this topic for more information.

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  3. Projects & Hosted Forums

    1. RetroChallenge

      What can you do given only one month and strictly "retro" hardware? Find out with RetroChallenge!
      http://retrochallenge.org/

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    2. 68kMLA Wiki

      The creation and maintenance of the 68kMLA's information repository.
      http://68kmla.org/wiki/

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  4. 68k Model Forums

    1. Compact Mac

      Macintosh, 512k, SE, etc.

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    2. Mac II, Quadra & Centris

      Just think, having a Quadra 950 in 1992 would be like having a Mac Pro today… except with more slots, more expandability, and on-board SCSI!

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    3. 68k LC & Performa

      Ah, the consumer computers!

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    4. 68k PowerBook

      From the Portable to the 190cs.

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  5. PowerPC Model Forums

    1. NuBus Power Mac, LC & Performa

      The NuBus architecture gets a new brain!

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    2. PCI Power Mac & Performa

      The PPC comes of age and adopts the industry standard expansion slot.

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    3. G3/G4/G5 Power Mac, iMac & eMac

      From the Beige G3 to the quad-core G5, via various iMacs!

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    4. PPC PowerBook & iBook

      All that power in a laptop? Never…

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  6. Everything Else…

    1. Apple I, ][, /// & Lisa

      Not really 68k Macs, but certainly Vintage!

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    2. Newton

      The best PDA ever finally gets its own forum!

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    3. Software

      Includes system stuff, productivity, emulation, design, and games for pre-OS X Macs!

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    4. Hacks & Development

      Yes, it's back! Hardware hacks/modifications and software development for Mac OS.

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    5. Peripherals

      Anything you can hook up to your Mac or stuff into it as an interface!

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  • Posts

    • Sorry, I meant to reply to this yesterday but didn't get time.  I was going to say that you could work out which sensor was dodgy by putting 5v and ground into the mouse and looking at the signals coming out of the sensors, but it looks like you've already worked out which sensor is dodgy.   Yes, this is definitely progress.   It sounds a bit like it's gone open circuit to me?  How much voltage is dropped across the resistor will depend on how much current is flowing (Ohm's Law).  If very little current is flowing then the change in voltage across the resistor will be very low.  If the circuit is open, the only current flowing through the resistor will be through your multimeter, which will be a minuscule amount, and so there will be no noticeable voltage drop.   So—a good first step might be to resolder that component to see if it's just a joint that's gone bad, and check that there's actually a circuit between +5v and GND involving that LED.  Failing that, you might be looking at replacing the LED.
    • Happy to, but I'm not going to be able to get to do it today—can you remind me tomorrow or over the weekend?  My short term memory is a bit ... questionable at the moment.
    • Is there a way to get a disk image of your scsi2sd AU/X partition? Been keen to set one up but I see it’s quite a tricky setup process...
    • Oh wow! And you're in the UK!   I've uploaded one of my more recent stacks into that collection  and it's super fun to explore being a mega HyperCard enthusiast myself
    • A/UX will run perfectly happily off a “virtual” scsi2sd disc. That is how my installation is set up: multiple virtual devices for a recovery disc, two MacOS versions and A/UX. Never tried it on a IIfx, mind, but it ought to work. 
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