[markrages]

> I've always wondered why no modern OS has gone the route of creating a "compatibility layer"

You could even hold down the Commodore key while booting to get a mode compatible with the previous system.

[digi_owl]

Yep. Many of their products stood or fell relevant to their C64 compatibility.

Once a install base has been built up, compatibility (or lack there of) can make or break you.