I don't know, but I do play some of the new games for NES/Famicom which are available freely (and there are some good ones!). (I even wrote one game myself, but never finished it, although you might be able to find it.) I also write some new computer games for DOS. (These emulators (i.e. software implementations) can be a VM, so that can be a VM to make your game, too. And yet, it can also work on the actual older systems, too, is also good.)