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Millfork: a middle-level programming language targeting 6502- and Z80-based microcomputers and home consoles
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A middle-level programming language targeting 6502-based, 8080-based and Z80-based microcomputers.

For binary releases, see: (latest: 0.3.4).
For build instructions, see Build instructions.


  • high performance, due to being designed and optimized for 8-bit microprocessors

  • multiple targets:

    • Commodore 64 (the primary target)

    • Commodore 64 with SuperCPU (experimental, incomplete and very buggy)

    • other Commodore computers: C16, Plus/4, C128, PET, VIC-20 (stock or with RAM extensions)

    • other 6502-based machines: Famicom/NES, Atari 8-bit computers, BBC Micro, Apple II+/IIe/Enhanced IIe, Atari 2600 (experimental)

    • Z80-based machines: ZX Spectrum 48k, NEC PC-88, Amstrad CPC, MSX

    • CP/M

    • Game Boy (experimental)

    • MS-DOS (very experimental, via 8080-to-8086 translation)

  • multiple supported target processors:

    • well supported: MOS 6502, Ricoh 2A03/2A07, WDC 65C02, Intel 8080, Intel 8085, Zilog Z80

    • reasonably well supported: Sharp LR35902, CSG 65CE02

    • partially supported: Hudson Soft HuC6280, WDC 65816, Intel 8086

  • inline assembly

  • simple macros

  • pay only for what you use: not a single byte of memory is used unless for code or explicitly declared variables

  • a simple memory model that avoids using the stack

  • multi-pass whole-program optimizer (that will even optimize your hand-written assembly if you ask it to)

  • support for multi-file programs (Commodore only) and banked cartridges


The compiler is distributed under GPLv3 (see LICENSE).

The standard include files (located in the include directory) are distributed under a more permissive Zlib license (see include/LICENSE). Therefore, no attribution is needed if you are developing and distributing Millfork programs.

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