This is a crossover between two Game Boy cartridge dumpers - gbcartflasher (project from 2007 by Kraku & Chroost) and GBxCart-RW by insideGadgets.
Actually, this is a port of GBxCart-RW firmware to gbcartflasher PCB. This was required to make dumper work with convenient FlashGBX client program by Lesserkuma.
Warning: while GBxCart-RW has GBA support, gbcartflasher hardware doesn't. So be careful and don't try GBA cartridges with this device.
TODO: write instructions
Because I ordered a bunch of gbcartflasher PCBs before I realized that GBxCart-RW is more improved while using almost the same hardware.
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gbcartflasher firmware: https://github.com/Tauwasser/GBCartFlasher (there are two verions, original fw is inside 'hardware' branch)
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gbcartflasher PCB: https://github.com/melka/gbcartflasher
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GBxCart-RW repo with schematics and old firmware: https://github.com/insidegadgets/GBxCart-RW/
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FlashGBX client software for GBxCart-RW: https://github.com/lesserkuma/FlashGBX/