For A1200s the best way by far is to get a PCMCIA network card. Consider that before anything else.
no matter what one ive tried my machine never can find it..the port works ..had a squirel on it before ..getting to the point where its all i really want to add to this machine .. got it playing mpegs ..avis etc ..all the whdownload games ..doom an even has a go at quake ..bit slow an painful..nice newicons desktop ..amigasys4aga ..
usb an added a fan to the indivision ..hardly any crashes now..but getting online has so far evaded me...years ago had a dial up an used a1200 then ..but networking to my pc is still on my to do list ..:<