This is a new disassembler I developed for use with 6502-based systems. By default, it produces output that can be assembled by DASM. It allows you to specify labels for addresses in the program being disassembled or for memory-mapped I/O registers and and ROM routines. Included is a configuration file with labels for the Atari 2600 and Atari 7800. Distance is open source software, distributed under the Mozilla Public License (MPL) .