10 CLEAR 29999
20 INPUT "Which file do you want to truncate?";f$
30 PRINT "Start tape to load file to truncate."
40 LOAD f$ CODE 30000
50 "Input how many bytes do you want to keep?";n
60 PRINT "Please rewind the tape and press record."
70 SAVE f$ CODE 30000,n
80 STOP