Use the tool online now, https://madlittlemods.github.io/vga-simulator
See this blog post for more info and how to use: http://ericeastwood.com/blog/vga-simulator-getting-started
The code is a bit crusty and old now but happy to have it on GitHub. It could also use a lot of optimization to make it faster, feel free to submit a PR.
- Python version by Pedro (@pvieito)
- Swift port by @pvieito
- ARC-Lab-UF/vga_simulator is adapted from @pvieito's Python simulator