A JavaScript 6502 assembler and simulator which runs in a web browser, forked from: https://github.com/skilldrick/6502js
Enhancements include a speed control (slider), load/save buttons, an 80x25 character memory-mapped terminal screen, and some basic ROM routines.
Some sample code to run within the emulator is available at https://github.com/ctyler/6502js-codeThis version contains experimental syntax highlighting utilizing Code Bedder (https://codebedder.com/) and Prism.js (https://prismjs.com/).
The 6502js assembler and simulator is distributed under the terms of the GPL version 3; see the LICENSE file. The code-bedder (https://codebedder.com) code is licensed freely ("This library is free to use however you like."). The Prism.js library is distributed under the MIT license (see the LICENSE.prism file).