https://github.com/redcode/6502

Highly portable MOS 6502 CPU emulator written in ANSI C
https://github.com/redcode/6502

6502 ansi-c c cpu cpu-emulator emulator mos

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Highly portable MOS 6502 CPU emulator written in ANSI C

• Host: GitHub
• URL: https://github.com/redcode/6502
• Owner: redcode
• License: gpl-3.0
• Created: 2013-12-11T14:02:11.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2022-12-24T04:33:51.000Z (almost 2 years ago)
• Last Synced: 2023-11-07T21:17:21.471Z (12 months ago)
• Topics: 6502, ansi-c, c, cpu, cpu-emulator, emulator, mos
• Language: C
• Homepage:
• Size: 129 KB
• Stars: 119
• Watchers: 7
• Forks: 16
• Open Issues: 2
• Metadata Files:
  • Readme: README
  • Changelog: HISTORY
  • License: COPYING

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README

        
     ____  ______  ______   ____

    /  _/_/\  __/_/\  __ \ /\_, \

   /\  __ \ \___  \ \ \/\ \\//  /__

   \ \_____\/\____/\ \_____\/\_____\

MOS \/_____/\/___/  \/_____/\/_____/ CPU Emulator v0.1

Copyright (C) 1999-2018 Manuel Sainz de Baranda y Goñi 

This is a  very accurate 6502 emulator  that I wrote many years ago.  It is fast,

small, easy to understand, and the code is commented.

Building

========

  You must first install Z , a header-only library that provides

  types  and macros.  This is  the only  dependency, the  emulator does  not use

  the  C  standard  library or  its  headers.  Then  add  6502.h and  6502.c  to

  your  project and  configure  its  build system  so  that CPU_6502_STATIC  and

  CPU_6502_USE_LOCAL_HEADER are predefined when compiling the sources.

  If you preffer to build the emulator as a library, you can use premake4:

    $ cd building

    $ premake4 gmake                         # generate Makefile

    $ make help                              # list available targets

    $ make [config=] [target] # build the emulator

  There is also an Xcode project in "development/Xcode" with several targets:

  6502 (dynamic)

    Shared library.

  6502 (dynamic module)

    Shared library with a generic module ABI to be used in modular multi-machine

    emulators.

  6502 (static)

    Static library.

  6502 (static module)

    Static library  with a  generic CPU  emulator ABI to  be used  in monolithic

    multi-machine emulators.

Code configuration

==================

  There are some predefined macros that control the compilation:

  CPU_6502_DEPENDENCIES_H

    If defined,  it replaces the inclusion of any external header with this one.

    If you don't want to use Z,  you can provide your  own header with the types

    and macros used by the emulator.

  CPU_6502_HIDE_ABI

    Makes the generic CPU emulator ABI private.

  CPU_6502_HIDE_API

    Makes the public functions private.

  CPU_6502_STATIC

    You need to define  this to compile or use the emulator  as a static library

    or if you have added 6502.h and 6502.c to your project.

  CPU_6502_USE_LOCAL_HEADER

    Use this if you have imported 6502.h and 6502.c to your project. 6502.c will

    #include "6502.h" instead of .

  CPU_6502_WITH_ABI

    Builds the generic CPU emulator ABI and declares its prototype in 6502.h.

  CPU_6502_WITH_MODULE_ABI

    Builds the generic module ABI. This macro also enables CPU_6502_WITH_ABI, so

    the generic CPU emulator  ABI will be built too.  This option is intended to

    be  used when  building a  true module  loadable at  runtime with  dlopen(),

    LoadLibrary() or similar. The ABI module can be accessed via the weak symbol

    __module_abi__.

Use in Proprietary Software

===========================

  This library is released under the terms of the GNU General Public License v3,

  but I can license it for non-free/propietary projects if you contact me.