IBM Palm Top PC110 [video]
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It was powered by a clockless 80C86 processor and lasted for 40 hours on just 2 AA batteries.
Most of the in-built applications (e.g. Quicken and Lotus 1-2-3) ran directly from ROM rather than being copied into RAM and then executed. That meant when you pressed the button to switch to that program it was available instantly.
Quite frankly, compared to the HP 200LX our replacement handheld device (mobile phone) is actually a backward step.
(their next model revisits sony vaio ux instead: https://gpd.hk/gpdwin3)
i got gpd pocket 2 (same hardware as win 2, but in a more traditional 7" laptop shell) as a collectible and ended up using it as my daily driver -- it is very much a typical intel 'ultrabook' in all aspects but size.
For those of you subscribed to LTT on Floatplane:
http://www.computinghistory.org.uk/det/20342/Olivetti-Quader...
It was £400, monochrome / DOS only, but perfect for fixing software in the field - I loved it but sadly it went U/S in the loft.
It's interesting now to look back at that transitional time in computing where you had mini-laptop devices as well as handheld organizers like Palm, both to supplement a full-size PC. Now the smartphone is all of those things for many users.
I am trying to work on a project at the moment, with a VHS case sized device, that is only used as a terminal to another (be that phone, computer, gibson, whatever...). Similar working princple to the Motorola Atrix Lapdock.
The idea is that, almost everyone is carrying around a suitable computing device - we just need a decent interface.
I think there is a market out there for such a device.
I haven't fully fleshed out what makes my device different from the others in this comment, I will say that it boots into an Open Firmware style Forth prompt.
It's an interesting device that's of this form factor. It has an older OMAP5, but it's placed on a replaceable daughter board potentially giving it an upgrade path.
https://liliputing.com/2020/07/use-samsung-dex-with-a-chrome...
You could probably do the same with a Raspberry Pi, but it might be trickier to do with an Android phone. A phone that supports Termux or UserLAnd would work well if you used adb port forwarding.