FLCHK.CO will calculate the length and checksum for BA, DO or CO files. Enter the full file name, including its ext. FLCHK.CO displays the "length/checksum" on the screen, it also opens CHKSUM.DO and saves the data. To exit FLCHK.CO just press [ENTER]. Note: FLCHK.CO uses the previous screen buffer for TELCOM and must be reloaded if you enter the terminal mode.