#600: This Free Tool Decodes Game Boy ROM From a Photograph

Can you recover working software from a photograph of a microchip?

Embedded systems reverse engineer Travis Goodspeed demonstrates how to extract the original Game Boy’s 256-byte boot ROM from a microscopic photograph of the mask ROM inside its CPU.

The source image was created by combining 22 microscope photographs captured at 50x magnification. Using his free, open-source Mask ROM Tool, Travis marks 2,048 ROM bit locations, separates the ones from the zeros and checks for possible recognition errors. He then determines the logical order of the bits, disassembles the program and shows how it can be exported as a ROM file for use in an emulator.

Travis also explains the Game Boy’s unusual copy-protection system. During startup, its boot ROM displays logo data supplied by the cartridge and compares it with Nintendo’s internal copy. If the logos do not match, the game does not boot. Requiring cartridges to contain Nintendo’s trademark gave the company legal leverage against unlicensed publishers.

The video also explores techniques from Travis’s book, Microcontroller Exploits. These include extracting protected firmware from an access-control reader, chemically decapsulating chips while preserving their operation and using ultraviolet light with a nail-polish mask to remove memory protection without erasing the program.

The Mask ROM Tool, Game Boy chip photograph and step-by-step tutorial are publicly available, allowing you to reproduce the ROM-decoding demonstration without owning a microscope or chemistry lab.

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// Link to No Starch Website for Travis’ Book //

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