the a1200 standard has a pcmcia slot on the left side of the box. At least mine did.
Be careful to choose a compatible pcmcia ethernet card, though. Not all will work, if I am correct. And what will work, I have no idea about.
They are cheap, though, and as someone pointed out, a good thing to buy for your a1200 imo.
Sincerely,
-Kenneth Straarup
