[mikepurvis]

Wasn't power management an issue with early portable computers? I feel like it wasn't until Windows 95 and beyond that machines were properly sleeping in between tasks— before then you were likely to end up just spinning the processor in an idle task.

This kind of thing can even be a problem trying to virtualize DOS stuff: https://www.os2museum.com/wp/idle-dr-dos/

[bombcar]

That was the other thing - it would run for ages on 2 AA batteries.

https://en.wikipedia.org/wiki/HP_200LX

30-40 hours but it worked out to basically "it was always good to go".