Binary package “xa65” in ubuntu disco

cross-assembler and utility suite for 65xx/65816 processors

 xa65 is a cross-assembler and utility suite for the 65xx series of
 8-bit processors, and the 65816, a 16-bit version of the processor.
 The 6502 was used in computers such as the Commodore 64, Apple II,
 and many more.