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Interface for Nintendo® Game Boy® Cartridges

This is a firmware for the Game Boy Cart Flasher, which was originally developed during 2005–2007 by Polish Game Boy enthusiasts Kraku & Chroost. This firmware is a reimplementation of the USB firmware in the C programming language.

For information on the hardware and original firmware images, check out the hardware branch hardware.

For information on the host software, check out the software branch reader_sw.


The Game Boy Cart Flasher is an ATmega8515 MCU which interfaces which either USB or RS-232 and a GB Game Edge Connector (GEC) Receptacle (REC) to communicate both ways. It can read ROM, read/write SRAM, and read/write commonly available FLASH chips.

The ATmega8515 communicates using UART either directly via a MAX232 RS-232 driver/receiver or via FTDI's FT232 USB 2.0 FS bridge IC. The ATmega8515 is clocked at 6 MHz.

This reimplemented firmware only supports the USB version of GB Cart Flasher.


Use Atmel Studio v7.0 or later to compile this firmware. You should have at least one .hex file after successful compilation.


The original files came without an explicit license other than the statement "[T]his project is free and any commercial use is prohibited". I, Tauwasser, believe the BY-NC-SA 4.0 International license to best match the spirit and intent of the original authors, Kraku & Chroost.

This C firmware reimplementation is licensed under the Attribution-NonCommercial-ShareAlike 4.0 International.

Copyright (C) 2005–2007 Kraku & Chroost (
Copyright (C) 2015 Tauwasser (

This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0
International License.

To view a copy of this license, visit
or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.


I'm not affiliated with Nintendo in any way. Neither are Kraku or Chroost.

Game Boy® is a registered trademark by Nintendo. Nintendo® is a registered trademark. All other trademarks are property of their respective owner.


Interface for Nintendo® Game Boy® Cartridges