The most reliable way to do this is with emulators. A full emulator is a complete description of some hardware and software combination. If we can keep emulato

The most reliable way to do this is with emulators. A full emulator is a complete description of some hardware and software combination. If we can keep emulators working on modern hardware and OSs, we can guarantee that most old games will be playable indefinitely. For example, if you have dosbox you can play a lot of old MS-DOS games without having an x86 CPU or DOS itself.