I wonder if FreeDOS has anyl relevance in our modern cloud-based VM world, where a real-mode operating system could serve as a razor thin wrapper for running applications on virtual machines with minimum overhead.

In these scenarios, having another layer of memory protection and pre-emptive multi-process multitasking might be completely unnecessary.

What is the nicest programming environment which will run in this (and fit on a floppy)?

Some small programming tool (nicer than Q/QuickBASIC) which had a nice facility for creating a Text UI could be useful.

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