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Rather than a "insane feat of software engineering" I would define PalmOS as rather "extremely simple", complexity-wise on the level of classic macOS despite appearing a decade later.

Right now, mobile stacks are usually even more complex that desktop stacks.

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One of the neat things about PalmOS is that it ran apps directly from where they were stored. No need to load them into "memory".

I loved the stylus because it allowed apps to be quite functional (I remember EasyCalc which could do wonders) on a 160x160 screen. 320x320 meant that you could do anything.

> One of the neat things about PalmOS is that it ran apps directly from where they were stored. No need to load them into "memory".

In practice this is not the way it worked on PalmOS on actual hardware past a certain point, and the way it actually worked is not that different from how code is loaded in a conventional desktop operating system.

What is called NVFS enters the picture so late in PalmOS story, and so few years before PalmOS hit the curb, that we can safely forget about it.

For most of PalmOS story, programs would for all intents and purposes be installed to RAM and reside entirely in RAM.

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