https://github.com/lambertjamesd/portal64/releases https://github.com/lambertjamesd/portal64/releases You need a file from the official Portal game, then it's

https://github.com/lambertjamesd/portal64/releases https://github.com/lambertjamesd/portal64/releases You need a file from the official Portal game, then it's an easy single step with an online tool to generate the demake ROM. edit: or see bhaney's download link on this thread.