[mananaysiempre]

> With modern electronics and displays

Wouldn’t the second part work against the first? There’s a lot of pixels you need to push to refresh a good modern display. I guess you could use a bad (as in low-res) modern display, but I wouldn’t expect those to be particularly concerned with energy efficiency either, just cheap.

[criddell]

A low-res display would be fine. In fact the same display as the original Model 100 would be great.

A sibling mentioned e-ink and that might be ideal. With a fast enough CPU and race-to-sleep scheduling, the machine would mostly be in a low power idle mode.

I think the temptation for a lot of designers here would be to use Linux and I think that would be a big mistake. A custom, basic OS with a few simple programs like the Model 100 or Psion 5 had would be ideal, at least for me. Or maybe even something like FreeRTOS (like the Flipper uses) if it is low power enough.

[reaperducer]

A low-res display would be fine. In fact the same display as the original Model 100 would be great.

Use one for a while before you decide.

I still use mine every couple of weeks for distraction-free writing, and to read the news. The display updates VERY slowly. So slowly that you don't have to be a very strong typist to get way ahead of it.

[criddell]

The display worked better 40 years ago. They lose contrast and responsiveness with age.

My favorite calculator is an HP-28s and it too has become slow and hard to see.

[ac29]

Yeah, the above referenced TRS-80 Model 100 had a 240x64 monochrome display with no backlight. No surprise it didnt use much power.

[raddan]

I would kill for an e-ink version. For a palmtop I don’t think a high-res color display is necessary.