Is it just / ?
I kid. But really, besides “its all a file”, if you take away the gui, is the only difference the syntax ? How libraries interact? How disks are mounted ?
If we stripped all ms’s junk out and made windows open source, would we still prefer linux?
When you get to a very basic level, is one of them more efficiently coded?
The OS bundled with TI-84 Plus CE Python Edition graphing calculators is a wacky one. It runs primarily on an eZ80 core for backwards-compatibility with earlier graphing calculators while also handling an ARM core for Python functions. Parts of the assembly code can be traced back to the TI-82 calculator ROM from 1993.
Most people wouldn’t think a calculator would ever need a security solution, but it even verifies application signatures so students are less likely to load cheating utilities on them.