I'm halfway there now. Someone in another thread suggested:
mount /mnt/hdc1 /mnt
...that didn't work, but this did:
mount /dev/hdc1 /mnt
...although it only worked on the 2nd try, as far as I could tell.
I was then (after making the internal CF R/W) able to rename the old pegasus driver and copy the new one.
But the new driver still won't recognize my D-Link DSB-650TX.
I cracked it open, and my D-Link definitely has the "Pegasus II" chip inside, which some people says makes a difference, (as opposed to the original Pegasus chip, I guess.)
So what do I do now? Might there be a newer-still version of the pegasus.o driver (compiled for Jailbait) that WILL recognize my D-Link?
...Or do I have to do the whole reflash-the-adaptor thing? The things I have read so far on here are not clear on whether adaptor updates are necessary for Jailbait, or only MSN.
I have been trying to reflash and having very little luck. First the ADDR.MAX file was causing me problems, because my MAC was higher than it allowed, but then I igored its warning not to edit, and finally got past that, to some other errors. (yay! no, wait...) Always some error when I run SROMB.EXE...