converting sco oracle to text file

Hi, I have a question concerning the way to turn an oracle 7.3.3.4 on sco db into a simple file on a linux box in order to turn it into an open source db... As I don't know how oracle run, i'd like to know if there's a simple way to do this. the original db sizes around 1Gb (for the whole files, but as it is oracle, i don't know if the db is really this big...). TIA for all the tracks that can be helpfull Regards Stephane