Symon is a general purpose simulator for systems based on the MOS Technologies 6502 microprocessor and compatibles. Symon is implemented in Java. Its core goals are accuracy, ease of development, clear documentation, and extensive test suites for validating correctness.
Symon simulates a complete system with a 1 MHz NMOS 6502, 32KB of RAM, 16KB of ROM, a 6551 ACIA, and a 6522 VIA.
Symon has extensive unit tests to verify correctness, and fully passes Klaus Dormann's 6502 Functional Test Suite as of version 0.8.2 (See this thread on the 6502.org Forums for more information about this functional test suite).
The compiled Java JAR file for each new release can be found on GitHub.
If you'd prefer to compile from source yourself, the project is hosted on GitHub.
To run Symon, you'll need Java 1.7 or higher. To build it, you'll also need Maven 2.0 or higher.
Copyright (c) 2013, Seth Morabito
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.