Tektronix hex format

Tektronix hex format (TEK HEX) and Extended Tektronix hex format (EXT TEK HEX or XTEK) / Extended Tektronix Object Format are ASCII-based hexadecimal file formats, created by Tektronix, for conveying binary information for applications like programming microcontrollers, EPROMs, and other kinds of chips. 
Each line of a Tektronix hex file starts with a slash (/) character, whereas extended Tektronix hex files start with a percent (%) character.
Tektronix hex format.
A line consists of four parts, excluding the initial '/' character:
Extended Tektronix hex format.
A line consists of five parts, excluding the initial '%' character: