DASM is a highly evolved cross-assembler for 6502, 6803 and 68HC11
processors.  It is very popular for hacking/cross-developing on old
6502-based video game systems from Atari, Nintendo, etc.  DASM
processes output from the Distella Atari ROM disassembler without
modification.

Homepage:
https://dasm-assembler.github.io/
