Emu XL-7 & MP-7 User's Group

Hey gang,
I don't own a computer at home (I use the one in my office at work), 
so please excuse this very newbie question. What do I need in order 
to upgrade my XL-7s OS? I understand that I need MIDI cables, but how 
do I hook them up to a computer? I've checked with all of my friends, 
and although they have soundcards, I don't see MIDI ins/outs on the 
back of their computers. Is there something I can buy that would give 
their computers this function? Thanks in advance to anyone who 
replies.
Fab