3310 make a flash cable from data cable

Hi,

I've got a data cable Mbus/fbus for my nokia 3310 and i was plaaning to
also use it as a flashcable.

Now i was wondering if the paralel-port plug needs e chip in it (read
something like that) or not.

And if not (would be a lot easier) what pins need to be connected to
what?

Hope someon can help.

Greet,
Eldin