I used to code on the Voyage 200, which also fit in my coat pockets: https://en.wikipedia.org/wiki/TI-92_series#Voyage_200

My fingers were small enough to touch type on those keys.

After I grew out of TI-BASIC, I always wanted something like that for computer programming, too, but I never managed to find one.

A laptop in regular-laptop shape that was 6" or so would be ideal for me. I've also been considering a phone/phablet with a keyboard case or keyboard cover, but none seem to be touch-typable. :/