EDIT: Ooops, skimmed the "wireless" part. I believe
Amigakit sells wireless adapters that work on the 1200, along with software for nice GUI config. of WEP encryption and stuff like that, otherwise the
prism2 drivers have been ported from linux, that link also claims to have a list of compatable cards, too.
Old post---\/
I use an old 3com etherlink III PCMCIA adapter, with
3c589.device and MiamiTCP. Works like a charm! (I even host web pages from my IP address on my 1200!)