What is the definition of Legacy Computing?

Legacy computing, my friends, is like the old-school video game consoles that still manage to make a child laugh today. Picture this: "The 'Legacy' system is so outdated it can't even handle a 4K game, let alone a self-driving car!"

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Now, here's an edgy example sentence using that term: "Our company's decision to stick with legacy computing is like choosing to eat ramen for dinner every day, except it's our entire IT infrastructure."