Recent content by speakers

  1. speakers

    68k->PPC->x86_64->arm64

    I've recently been tinkering with some 68k assembly code in a program originally developed for MacOS7. I'm using CodeWarrior Pro 4 under MacOS9 in a Qemu emulation of a PPC machine running on my M4 MacBook Air. Qemu is Intel. So what I have is: 68k instructions emulated as PPC by the 68k...
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    Macintosh IIci - no life even after recap

    Yes, 1 should be connected to 2.
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    Macintosh IIci - no life even after recap

    I think it should possible to put a shorting link in the base of the terminal block between pins 9 and 10 and still be able to put the PSU in place. But I haven't ever tried this .. I have an extender cable (made by cutting down an ATX extender).
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    PowerMac 7100 and Linux

    See https://github.com/speakers-k64/linux-2.4.27-pmac-nubus.git
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    PowerMac 7100 and Linux

    Although the original source is nowhere to be found, I have discovered a nubus patch for Debian Sarge archived at debian-nubus.diff.gz and this applies OK to a 2.4.27 source archive from kernel.org at linux-2.4.27.tar.gz I've managed to configure and build a kernel from these sources that...
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    Macintosh Classic II -12 Voltage Issue

    They're the widely-available Bomarc schematics, e.g. at https://github.com/nickpunt/nubus-se30/tree/master/Schematics/bomarc Nate that the analog board for the Classic II is the same as what's on the Classic schematic.
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    Macintosh Classic II -12 Voltage Issue

    Oh, my mistake .. I was looking at the wrong schematic .. the Classic II does have +5v, +12v and -12v on the floppy port. That explains my confusion o_O Doesn't apply. Nope - QP1 affects all rails. Your problem is likely a bad IP3 regulator on the analog board.
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    PowerMac 7100 and Linux

    I was wanting a BHA machine and I acquired, from craigslist, a PM7100 in excellent condition. There was absolutely no sign of capacitor aging - including the PSU. The original 700 MB Quantum SCSI harddrive was function although it didn’t sound perfectly happy. The floppy and cdrom drives were...
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    Macintosh Classic II -12 Voltage Issue

    I'm confused. The Classic II doesn't have a -12v rail. It has +5v, +12v and -5v. and I've recently restored one - see https://tinkerdifferent.com/threads/a-mac-classic-ii-restoration.4313/ If you're measuring -2.67v on the -5v line, that's not good though. It won't prevent booting but it will...
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    Macintosh IIci - no life even after recap

    The IIci startup logic is notoriously susceptible to damage. One testing trick is connect PSU pin 9 (signal) directly to pin 10 (+5v standby) to bypass the logic and force power-on.
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    A Mac Classic II restoration

    Thanks for that reference. Before the DeoxIT treatment worked, I'd searched for a replacement but couldn't find anything.
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    A Mac Classic II restoration

    My Mac addiction started in 1987 with an SE to which I added an 020 accelerator. Next was a IIci in ’92, adding 040 accelerator in ’96. On to G3 desktop in ’98 and G4 accelerator in ’02. And on and on. I still own the SE which works well after an analog board recap and reflowing. Recently, I’ve...
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    IIsi w/ROM - repair and photos

    Thanks. At first, I wasn't too confident that I could breathe life into the floppy drive. But the schematics were available and I had similar (although not identical) units on hand for reference. So I poked around and was pleasantly surprised when it came back from the dead. I was particularly...
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    IIsi w/ROM - repair and photos

    IIsi's do seem to suffer terribly from cap goo. For more tales and pix of electrolyte destruction see A (mostly) successful IIsi restoration
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    Not enough power for Blue SCSI Wifi

    I used a Pico in my SE/30 but it's wifi performance was poor. The EFI case shielding and the metal chassis attenuates the signal too much. For a while, I used a cheap Vonets WiFi Extender in repeater mode placed close to the machine to relay the signal. But that was a kludge and I ended up...