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cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.

cc65 has C and runtime library support for many of the old 6502 machines, including

• the following Commodore machines:
  • VIC20
  • C16/C116 and Plus/4
  • C64
  • C128
  • CBM 510 (aka P500)
  • the 600/700 family
  • newer PET machines (not 2001).
• the Apple ][+ and successors.
• the Atari 8-bit machines.
• the Atari 2600 console.
• the Atari 5200 console.
• GEOS for the C64, C128 and Apple //e.
• the Bit Corporation Gamate console.
• the NEC PC-Engine (aka TurboGrafx-16) console.
• the Nintendo Entertainment System (NES) console.
• the Watara Supervision console.
• the VTech Creativision console.
• the Oric Atmos.
• the Oric Telestrat.
• the Lynx console.
• the Ohio Scientific Challenger 1P.
• the Commander X16.
• the Synertek Systems Sym-1.

The libraries are fairly portable, so creating a version for other 6502s shouldn't be too much work.