This python-based tool is a disassembler for the Atmel MARC4 (a 4 bit Harvard micro).
You can download it from the following link: https://packetstormsecurity.com/files/download/119966/marc4dasm-master.zip
Source: https://packetstormsecurity.com/files/119966/Atmel-MARC4-Disassembler.html