I love this. My main concern is that even a 7.5” e-ink screen would feel like trying to write and read on a postage stamp. When I’m writing I set my font size to be much larger than normal so I can easily skim back over the last few sentences without having to lean in or focus too hard.
I got a Pinebook Pro to ostensibly serve the purpose that this device would serve–a simple no-frills distraction-free writing device. I set it up with Arch Linux and a super minimal windows manager (herbstluftwm) with a few hotkeys defined to open a xterm, open focus-writer, or open a minimal web browser (vimb). I think something like the Pinebook Pro with an e-ink screen would be my dream device.
(Unfortunately just having the ability to drop to a shell is proving to be too much distraction for me, because I’m always wanting to tweak something on the device. Hopefully I’ll get bored of that with so few actual software packages installed and be compelled to spend more time writing and less time tweaking.)
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I was experimenting with a small display attached to raspberry pi zero and displaying only one word at a time. It’s surprisingly pleasant and does not cause eye fatigue. Now I’m experimenting with a tiny board from lilygo t5 with integrated buttons and a lipo battery, should be perfect for short reading sessions.
Your last paragraph shows one of the reasons for this, others being battery life and keyboard feel.
For the size, I have not measured it whatsoever, but I guess it will be similar to the visible area on paper arc rising from the real typewriter.