IIRC, Intel bought Xircom, so you may be able to find it there, Also, I think the XIRCOM was an OEM of the Dayna one so it may be supported by later Dayna installers.
There is a JetDirect card that plugs into the LJ 4+. I think there are a couple of versions, but at least one has an AppleTalk port (in addition to Ethernet jack). I believe the part number is J2552A.
Damn, I wish I had saved mine when I junked my LJ 4.
Somewhere around here I have a fairly late slide rule whose instruction book talked about the slide rule being a device that allowed the computer to perform his job faster and more accurately.
A few years ago, I used BatteryRefill.com to rebuild the pack for an IBM ThinkPad T20. I seem to recall the price being reasonable, though the fact they had to regale the pack was also obvious.
It's probably based on an Atheros wireless chip. For Mac OS X, you want one based on a Broadcom chip. (The exact opposite advice of what'd you get if you were going to run Linux. :)
I'm kind of not surprised that you can only run SL. Is that generation of Atom even 64-bit compatible? (If not...
There were actually two cards- a Mac86 which was an SE expansion board and the Mac286 which was Nubus. I've never seen a Mac86 in the wild, but the Mac286 was basically a single (er, two) board computer which interfaced to the Mac and had its own memory. 1MB was the normal memory on a Mac286...
Funny, I used to love my Aironet. I used to use one with my WallStreet. IIRC, it was the only card with drivers for both Classic and OS X (besides a real Airport card).