bin:

Bin format is raw memory dump of code and eeprom. Code is aligned to 16bits opcodes and all memory skipped with .org directive is filled with nop's.

bt:

This is text file format. Every line has offset and n-bit opcode written in binary notation:

 0000 00000000000000

 0001 00111000011001

 0002 00011110001111

hex:

This is Intel HEX file format used by most hardware that 'burn' code to some devices. File is text file, and every line have format:

  :LLAAAATTDD....DDCC