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I got my hands on a barebones 7100, in not the best shape. I cleaned the logic board, but have not yet recapped it (I'll do that eventually, but caps take a few days to arrive and I want to make it work before then if possible). I'm using a modded ATX PSU since the stock one immediately turns...

I have a IIci board which apparently had a dead 68030, which was removed leaving a clean pad.  I'm trying to figure out what I can use to replace it. I know the IIci ran at 25 MHz, but for some reason 25 MHz 68030s are expensive on eBay.  However, 33 MHz chips seem to be far more plentiful. ...

Sounds like everything needs a recap.

I did the initial lubrication before seeing that video, and did it the same way as I've done others, following the guide here: https://wiki.68kmla.org/Floppy_drive_lubrication, where the instructions are to use white lithium grease, which is what I used.  It seems like it slides easily.  The...

The new gear has arrived, I installed it and lubricated the gearbox, and put it all back together.  But the eject mechanism is still not able to fully engage -- the motor spins and pushes the cage up halfway, but not enough to actually eject the disk.  I've already also lubricated the mechanism...

I suspected it was something like that, but then the question still stands of why it worked in the IIcx...

Update:  Turns out it's caused by the combination of the ROMinator II I had installed (to avoid the memtest and give me a boot disk) and the IIfx.  The ROMinator II worked with my IIcx running A/UX so I didn't think to try without it.  Swapping in the original ROM made it boot up fine. Anyone...

So I've had success with A/UX on all my other machines that can run it except this IIfx.  All I get out of it is a gray screen after it bootstraps, forcing me to reboot.  This happens both when I use the installation floppy coupled with a SCSI2SD with the CD-ROM on it (which is how I installed...

Update:   I opened one of the first two's eject mechanism gear box, removed the gears, and found that it was just stuck, even though the grease wasn't that bad.  I re-greased it and put it back together and now it's good as new. I also lubricated the third one's drive tray, and cleaned it with...

I wasn't sure where to post this as this spans Mac categories (these drives came from a II-series, Portable, and SE/30). I have 3 drives that are dead and am wondering if any of them are likely to be fixable, or if I should just toss them and not spend hours on a futile effort. Two of them...

The Mac now boots. Swapped all the capacitors and she fired right up.  This machine came with a Supermac video card (looks like a Spectrum/8 Series III), but I had to swap in a Mac II video card since the Supermac was having trouble with the monitor I'm using.  The hard drive (looks like an...

I’ll check to see if there was over voltage on the 12v line; I should be able to power on the supply without the logic board if I just provide +5V from USB or something, right? These were the factory tantalums, so they shouldn’t be under specced.

In that case I'll wait; the caps will probably show up this week, so I don't save a lot of time by trying to boot the machine now.  I did desolder C1 (far more easily than I expected) and found that the pads underneath were pristine. Could it be because C1 is the only one on the 12V rail?  All...

I recently acquired a IIfx that was sold as totally dead.  When it arrived, first thing I did was remove the old batteries and swap in new ones (since this machine won't power on without them).  I then tried to turn it on.  Clearly the batteries were the cause of the "totally dead" issue, since...

There's an entire archive of A/UX software that gets installed under /usr/local kicking around somewhere.  It includes a bunch of GNU tools including GCC.  I just FTPd it to the box and untarred it there. It's...

When you say it's behaving weird, what exactly does that mean?  You get signs of life out of it but it behaves erratically?  If you even get a chime (either kind) out of it I'd think that eliminates the CPU as being the problem. I have a IIci with what I believe to be a dead 68030, and that's...

Yes, that notch is there to mark Pin 1.

That software can read old unknown ROMs?  Last time I tried I wasn't able to make it work either, trying to read a ROM out of some old 6502-based terminal I was messing with.  For that thing I ended up just wiring up a microcontroller I had laying around.

On my board, the 74LS253 was installed on a little PCB attached to a header.  I just removed it and used a jumper to jump the two pins that corresponded to the cut trace.  Now as far as the Mac is concerned, it's back to only having 128k.

Do you know of any ready-made development boards for Atmel/Microchip's CPLD lines?   I can't find any, and I really don't want to spin my own board for one at this point. I built a circuit based on the VHDL code that generated the waveform I posted earlier, but while it didn't stop the machine...