Emulation Software
This isn't necessarily restricted to gaming-class hardware, or even PC's, but a thread that any will find interesting:
Internet Archive Brings 1000's of Free Arcade, DOS, & PC Games to Your Browser
Perhaps more stable emulation than universal HTML5 javascript run through browsers is to use actual emulation software. Let's assume one is using Windows, since it's the most common platform by far, and if you're using Linux, you're probably not the type who needs a ton of help. This is a frequently updated Reddit post that gives a survey of the different consoles and their finest emulators on a Windows PC:
emulatorguide: PC Master Race
Here is the master subreddit for all things emulation. You can learn the finer points of emulation, here. For example, you can reference this for discussion of accessories where you will learn that you can purchase the original controllers for the respective consoles, brand new at stores like Amazon, designed specifically for PC emulation, and for very little money. To offer an example, the last time I checked, it was $12 for a Nintendo pad with a USB-input at the end of its cord via Amazon.
https://www.reddit.com/r/emulation/
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