`swapdump` is a diagnostic utility for Game Boy flashcarts.

Via a simple ASCII file format, it can test writes and reads, and ouptut
to a text file.  It also performs a checksum of ROM banks for verifying
broken cartridges.

Requires Sanqui's fork of rgbds to build: https://github.com/Sanqui/rgbds

If you'd actually like to use this, don't hesitate to ask Sanqui for advice.