Why Can’t 64-Bit Operating Systems Run 16-Bit Apps?

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Once computers started using the modern 64-bit architecture, users soon realized that running those old 16-bit applications wasn’t going to work. Why can’t 64-bit machines run 16-bit apps? The answer to that question can be confusing, depending who you ask. For one thing, it isn’t actually impossible to run 16-bit apps. It’s just difficult. Secondly, the reason for this difficulty lies in both the CPU architecture and the operating system. Confused yet? Don’t worry, you aren’t alone. But by the time you get to the end of this article, you won’t be confused anymore. The History of CPU Architecture I…

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Source: makeuseof
Why Can’t 64-Bit Operating Systems Run 16-Bit Apps?