Submitted a few months ago with a bit of discussion: https://news.ycombinator.com/item?id=27546352 . Most useful is the reference to the following issue, as the project’s forum was removed: https://github.com/sarah-walker-pcem/pcem/issues/32

Past submissions of the domain, including a couple >= 40-comment ones: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

GitHub: https://github.com/sarah-walker-pcem/pcem

Unfortunately the program needs ROM files (not supplied) for most (all?) of what it ‘emulates’.