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Looks great!

It looks like /ARST is the main reset for the logic board. As far as I can see (looking at the schematics on my phone…) /BRST only goes to the MDU (U11). The audio sound chips drive the reset to the other components. If you have an o’scope or logic analyzer, it would definitely be worth...

@cy384 Outstanding, thank you!

Sorry, yes, I wasn’t clear - it wasn’t that I was expecting the 5V rail to vary across the board - I just wasn’t sure which voltage rail any of the capacitors were on, and figured it was worth checking a few of them to see if we could get data on some of the other rails. Checking based on the...

Yes please! (Sorry for the thread hijack, VNC server looks great!)

Thinking about this some more, I don’t see anything in the soft power circuit that would cause the issues you’re seeing, other than something that would drag the power rails out of spec. The schematic you posted show what appear to be the primary voltage rails: +12V, +11V, +5V, +4V, +5V...

Out of curiosity (and off topic), how are you handling A-Traps in Ghidra? Last time I looked it didn’t have a graceful way of handling them; they were flagged as unknown instructions and the following disassembly was rather muddled. (And of course, it would be really nice to translate them to...

What resistance are you seeing between 5V and GND on the logic board? Do you have the power supply connected when you measure it, or just the board by itself? If you power up the logic board, what voltage do you measure across the yellow capacitors? When you measured 12V and 5V on the HD...

Did you install the AirTalk extension? At least, I’m assuming that installing an extension is a prerequisite for AirTalk showing up in the Chooser (just like there are extensions for different Chooser printer drivers and AppleTalk).

I believe hda’s are just raw disk images. dd on a *nix OS is probably your best bet

Out of curiosity, can you telnet to servers on the Internet from one of your modern machines? I’m wondering if maybe your ISP is blocking less commonly used protocols.

A number of folks here have recommended a plastic solvent called Weld On 2354. If you use the search function you’ll find other threads discussing it. That might be your best bet, but I don’t have any personal experience with it.

Sounds great - I thought that was probably the case, just wanted to check (and had to remind myself that you’d done the LC II). Thanks!

@max1zzz Any chance you can post this board (and the IIcx one) on your GitHub along with your LC and LC III? Thanks!

Does anyone have a copy of the LC Developer Note? I found the LC II one, but it points to the LC one for a lot of details since their architectures are so similar. So far my Google-fu hasn’t turned up anything.

Zero track sensor

Glad you got it straightened out and that everything is working!

Out of curiosity, how big is that archive? Would you be willing to let others clone/mirror it if we could coordinate an appropriate time and method to do so?

It should be fine. The drive electronics are grounded through the cable. I tested a drive for my SE the same way the other day.

It looks like it has 32, 256k x 1-Bit DRAMs, which would make it a 1 MB SIMM. What’s unclear to me is how the 32 DRAMs are muxed into a 30-pin SIMM, which only has 8 data bits. Maybe those other two chips do some sort of chip select decoding based on address? Not sure. Either way, I think you’d...