High Quality Content by WIKIPEDIA articles! The Motorola S-record format is an ASCII hexadecimal ("hex") text encoding for binary data. It is also known as the SREC or S19 format. Each record contains a checksum to detect data that has been corrupted during transmission. The first record (S0) may include arbitrary comments such as a program name or version number. The last (termination) record (S7, S8, or S9) may include a starting address.