I found your topic searching for "Macintosh portable Q16". I've opened my Portable for the first time yesterday, because I wanted to recap it after some years in my attic. One of the last time I used it, many years ago, I have tried to install the Com card, and instantly I've got a burn smell. Shut the Portable off, removed the card, booted it again, and it was still working.
So today I've checked the card : light corrosion near the ports, one capacitor seems leaky, and Q16 seems fried.
So I've some questions, and here seem one of the best places to get an answer
I don't want to d