cc65.github.io - cc65 - a freeware C compiler for 6502 based systems

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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 Super

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