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My read on it is that they were worried about ESD damage. I’m sure the external ports have ESD diodes to protect the SWIM, while this approach would be a direct, unprotected connection to the SWIM. Fine if you’re careful, and don’t hot-plug anything. Not so fine otherwise…

Wait, really? I had no idea that was a thing! Which jumper is it?

Might also be worth checking those socketed parts, see if the contacts need to be cleaned or de-oxidized. Seems like flexing could cause them to seat in a way that does or doesn’t make contact properly, and I know others have had problems with sockets on other boards. Edit: Or the SIMM sockets...

Yay! Now that’s a happy result!

Well hopefully it’s helpful and not a wild goose chase! 😀

I have a vague recollection of someone on this board having a problem like that which was related to the SCC and serial ports - that earlier System versions didn’t test the SCC, but later versions did.

I think the intent of the screw was as a low-security method of keeping people from taking the cover off - basically no protection, but at least an inconvenience. (I’ve always imagined it was to keep kids in schools from poking around inside).

Does anyone know which models used the same (or compatible) interconnect cable?

I just did a build and install of Netatalk 2.2.10 on a fresh Ubuntu 2022.04 install, and it went really smoothly. I had an existing set of post-install config files from a prior install, so that helped with the configuration, but the actual build/install process was pretty smooth. Edit: I’m...

Very cool! Any other tips on the process, or good sources of replacement polarizers? I look forward to seeing the final result!

Awesome, thanks! I’ll give that a shot if replacing the cells isn’t enough.

Did you ever post any notes on the EEPROM swap? I followed your 540c rebuild thread but don’t recall seeing it. I apologize if I missed it! I have a 520c with what I think is an intact (but dead) battery that is love to get going again.

Fair enough

@LaPorta (I think) identified this as the modern version of the grease originally used on these drives. I’ve used it in a few drive rebuilds, and others swear by it: Molykote EM-30L https://www.amazon.com/dp/B00CAYWNCW

That would be @jcs, he’s a contributor to the BlueSCSI/BlueSCSI WiFi project, among other things.

I guess I wouldn’t write it off until it’s proven that 12 ohms is too low for that part of the circuit. It seems like not much is known about the EMM. I agree, 12 ohms would be too low for a purely digital circuit, but I’ve found that power/analog circuits are less predictable. For example, the...

I don’t know if I’d sign up for “PSU expert”, but generally speaking a power supply should be able to deliver their rated current (Amps) while maintaining their output voltage. Current is a “pull” (device draws what it needs) rather than a “push” (supply pushes some value). The problem comes...

I don’t know what the thermal limits of the G3 in the Lombard is, but modern CPUs have a maximum junction temperature (inside the package) of 100C or higher. Commercial grade parts generally have a ~85C ambient temperature limit. I’d say as long as you’re well under 70C you should be ok...

@bigmessowires sells the Wombat ADB-USB which does just that - you can connect USB keyboards/mice to old Macs, or you can connect ADB keyboards/mice to modern machines.

No problem! Be careful - the plastic wrinkles easily. Look for dark spots (corrosion) on the traces or obvious breaks. I think I used a multimeter in continuity mode to check suspect traces. The conductive paint can also remove the existing good traces from the plastic, so just try to bridge any...