Recent content by speakers

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...

Yes, 1 should be connected to 2.

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).

See https://github.com/speakers-k64/linux-2.4.27-pmac-nubus.git

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...

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.

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.

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...

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...

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.

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

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...

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...

IIsi's do seem to suffer terribly from cap goo. For more tales and pix of electrolyte destruction see A (mostly) successful IIsi restoration

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...