Interesting. I’ll have to see if it works with AppleTalk if I ever get sent one for my (currently broken) MDDI got one of the early access boards (got here overnight to the US even!) for my QuickSilver. I wasn't using the internal modem, and I wanted to be able to use a wifi modem with it to connect to BBS's and for testing my own BBS. Installation was a breeze, but I couldn't get ZTerm 1.1b7 (PPC version) to work with it. Interestingly, the 68k version (1.0.1) works just fine and allows you to properly select the gPort serial driver. We're up and BBS'ing!
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I'm not sure to understand your question. Don't you see my picures ?Nice! What does the breakout board look like?
There is no secondary board. This board replace directly the modem one in the Cube as you can see in the attached installation manual.
Surprise, surprise, it's a DS8925...
It seems that was the only chip that ever got used on these cards for G3s and G4s. I'm not entirely sure why, probably just because they were cheap and plentiful.
I looked up the chip, it appears they used it because it was well-optimized for AppleTalk
I don't know if you are aware of but, for your information, the Mac Mini G4 modem card (ref 922-6492) is used in many other models of Mac:
@CircuitBored You'll need a putty knife and patience. There are other methods too.