SYNTAX:
SAVE FILENAME [START] [END]
SAVES A FILE TO THE SD CARD. IF START AND END ARE
SPECIFIED, A BINARY FILE WITH TAG #06 WILL BE CREATED
WITH THE MEMORY CONTENT FROM THE ADDRESS RANGE START-END
(INCLUDED). IF START AND END ARE NOT SPECIFIED, THE
BASIC PROGRAM CURRENTLY LOADED IN MEMORY WILL BE CREATED
WITH THE CORRESPONDING #F1 TAG.
