Viciious

Viciious is a free JavaScript emulator of a PAL Commodore 64 that runs in web browsers or as a Node.js bundle in a terminal. It is intended for exploring C64 hardware and software. The emulator recreates the VIC-II graphics chip at 320×200 resolution in 16 colors and the SID synthesizer with three simultaneous voices, each spanning nine octaves. A BASIC environment and half-assembler support experimentation with 6502 opcodes in inline JavaScript. In a browser, users can drag in .t64, .d64, .tap, .prg, and .sid files. Real-time scopes show machine activity, including sprite pixels and device access to RAM. Its distribution is a self-contained HTML file that runs serverless without accessing the Internet; a Node.js bundle can also run in a terminal. Viciious is not cycle-accurate, has no disk-drive emulation, and lacks some features such as sound filtering. The project says compatibility is incomplete because of emulation limits and bugs. The interface is unsuitable for mobile use, even though the emulator can run there in real time. The code and UI assets are public domain, with exceptions noted for bundled ROMs, tests, and demo programs.