Lines

Each line contains hexadecimal data, each byte represented by two hexadecimal nybbles in upper case. Characters not in this set, but larger than 0x30 (e.g. lower case) will be ignored, less than 0x30 (e.g. CR or LF) are considered record terminators. Comments are problematic; don't try this at home.

Fields

Each line contains a 4‐byte address (big endian), a 1‐byte length‐and‐mode, and then data bytes as dictated by the length. There is no checksum. A zero length record is an execution start address record, non‐zero length records are data.

The length‐and‐mode byte is formatted as follows:

Mode

These bits are ignored by SRecord in input (00 = bytes, 01 = half words, 10 is reserved, 11 = long words). These bits are always zero on output by SRecord.

R

This bit indicates a data read rather than a data write; SRecord does not accept input files with this bit set, and will not set it on output.

Length

The length of the records data bytes. It does not include the address or length bytes. The maximum payload of a record is 31 bytes of data.

Size Multiplier

In general, binary data will expand in sized by at least 2.35 times when represented with this format.