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That's very, very cool! I had seen the boxFlags for the IIci-based SE/30 and wondered what such a logic board would have looked like or if there are any out in the wild. This is the next best thing!

A reader on my blog figured out one little tidbit: the "jy" in "msjy" stands for John Yen, who is listed as the inventor on Apple's patent for this functionality. I didn't even realize the patent existed until now. It had screenshots of all of the stuff I showed off. The "ms" could be...

I've definitely searched even on drives that I know have been reformatted, with a hex editor looking at the raw bytes from a dump made with ZuluSCSI. I think depending on how the formatting is done, remnants could definitely potentially be there. The biggest problem is that I'm pretty sure...

I found some time to write up everything and also shared as close to a factory-fresh drive image that I could create, so anyone else can download and play with this functionality in MAME. The recovery partition even works on the IIci and the Classic II, verified on hardware...

That's really cool that you went in there and replaced the rubber! For what it's worth, that piece of rubber isn't the one that causes the head to get stuck toward the inside. That's the one that prevents the head from coming off the platter. Based on your pictures I'm guessing this is a...

Ahh yes, those are probably good to replace (they look so much like tantalums but they're not). It's still very possible that the sticky rubber is getting you. Maybe the first time you ran it successfully, the head mechanism wasn't fully stuck but after it shut down, it really dug into the...

Hmmm...for what it's worth, I just tested my Centris 610 with a random Mac-to-VGA adapter (no switches, I think it picks normal VGA mode) and it works great. With a 10-switch adapter just like the one BMOW pictured at this link, it also works great with switches 2, 3, 6, and 7 on. That sets it...

Here's a DeclROM dump of the Newer Technology Ethernet MicroDock. PCB photos (sort of) are at this old post where I originally repaired it.

Ahh, that makes sense. I saw that it was defined as "Reserved for Macintosh compatibility" but couldn't understand what they were getting at. That makes total sense and I agree that it's probably a bus error then.

This seems like it could be an interesting puzzle to solve. The leaked SuperMario ROM sources give a lot of info about these codes. Can you double-check that you have provided all of the characters? I think between the *APPLE* and the *1* there should be 12 hex digits, and you only have 11...

Very neat write-up, as always! I’m wondering if maybe it’s a TMS34061FNL. That seems to fit the markings pretty well, at least I think so…

Thanks for the kind words! I'm glad to hear it's working for you.

I don't think what I'm going to say really explains anything, but the way I interpret the schematics, having a resistor populated would make it a 0. Because they each have 4.7k pullups pulling the line up to a logical 1, and populating a 47 ohm resistor to ground will drop it down to a logical...

You’re welcome! If you did see a comment by BMOW about that, I wonder if he was referring to something bbraun said at the bottom of that last link I posted, where if the ‘cicn’ ends up too big, you end up having to relocate things. Seems like that could get a little tricky.

I'm the author of the software and firmware for the ROM SIMM programmer. Unfortunately I have never found the time to make a tool that does a bunch of commonly-wanted ROM hacks like custom icons and chimes, but I think there are a few options: The 32x32 pixel Happy Mac icon is at offset 0x17F2...

Turns out this hard drive also definitely came from a Performa 550. Luckily the owner had run MacCheck and saved a report, which said: 80 is gestaltMacLC550. Too bad it had been reformatted in 2000, I could have learned some interesting stuff from this one. Yep! It was definitely not...

Nice! I wonder if Apple Backup is still present on it. The easiest way to dump the HDD is to use a ZuluSCSI or BlueSCSI V2 with initiator mode, although with someone who's not tech savvy I realize that can be tricky. Ahh yeah, definitely for a 630 then. Mystery solved! I bought a 160 MB Apple...

Thanks for taking a photo! Ah yes, I've heard of Internal HD Format. My understanding is that it only works with Macs that have IDE drives: https://machut.net/files/manuals/macintosh_performa/0306379PerformaHDupdt.PDF I'm thinking maybe that disk actually came with a Performa 630 series...

Thanks! As soon as @Dandu mentioned that this existed, I knew I just had to find it. I didn't want it to be lost forever. And as these hard drives age and go bad due to gooey rubber or whatever else, it's only going to get harder and harder to find working ones. So I knew time was of the...

I'm extremely curious about that as well. If anyone has a 575 that has never been formatted and has the ability to dump the hard drive with a ZuluSCSI or BlueSCSI in initiator mode, I'd love to take a look. By the way, I'm still working on sharing the partition content with everybody. I just...