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halkyardo

Well-known member From Minnesota, USA
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    New hardware project: an adapter to connect an HP logic analyzer directly to the PDS slot of an SE/30. Mostly just built it out of curiosity, but it could be a powerful tool for troubleshooting faulty machines or developing new hardware. Expect a writeup soon :) IMG_3149.jpeg
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    Let’s see how many 68k machines I can precariously stack on this flimsy folding table…IMG_2186.jpeg
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    Reactions: Snial and joshc
    Snial
    Snial
    Looks like there's room for another couple of compacts! If you re-arrange the order so that there's two compacts on the bottom, then the IIfx, then another couple of compacts, then the HP Oscilloscope, then it will hold together - like bricklaying! And the wooden table legs are under compression; look fairly straight so, what could go wrong ;-) ?
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    halkyardo
    this wouldn't be the first time the words "load-bearing Compact Mac" have been applicable to something in my life.
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    CircuitBored
    CircuitBored
    I have that same HP 'scope. Aren't they lovely? That green phosphor is intoxicating.
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    current status: in a battle of wits with GCC's optimizer. My driver works beautifully when compiled with -O2, but fails miserably with -O3. Either GCC is being too clever, or (more likely) I'm being very stupid.
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    halkyardo
    aha. don't you love it when you implement your own memcpy() around some specific memory-access constraints, and then the compiler thinks "hey, that looks like a memcpy(), let's throw away your carefully-written that works around your constraints, and replace it with a generic 'optimal' version!"
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    ahahahahahahahahahaha, turns out the deadlock bug I've been chasing in my Ethernet driver might not be a 'me problem' after all. My IIfx with an Asante NuBus ethernet card locks up under the exact same circumstances 🙃
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    More success with my SE/30 ethernet card driver! Managed to track down a very subtle bug that was causing lockups when mounting large Disk Copy images from a network share.

    It's working pretty nicely now! Just got to get around to finishing that next hardware revision...
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    Reactions: demik, Phipli and cheesestraws
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    halkyardo
    oops, spoke too soon, turns out I'd just kicked the can down the road and the lockup still happens, it's just harder to reproduce. Back to the drawing board.
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    Going more than a bit mad trying to get my ethernet driver to work. I'm clearly just getting some register-saving thing wrong or off-by-one-ing a memory copy but I've gone over it so many times and I just can't see where I could be going wrong.
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    halkyardo
    As far as I can tell it works just fine with MacTCP, but when using it for AppleTalk it sends the system off into the weeds as soon as you try to log in - and the actual crash happens after my driver code has returned, which makes it extra fun to try to figure out how it got there.
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