The BackBit Tool is a fully open source cross-platform JavaScript application that creates .BBT files for use with the BackBit cartridge for Commodore 64.

The BBT file format offers the following innovations:

• Prepend SID music and title screen/screenshots
• Autostarts to any program
• Incorporates up to 8 disk images (D64/D71/D81/D8B)
• Supports up to 4GB of binary data
• Tags important details about the program, including text and screenshots