[EdSharkey]

My drinking buddy in the early 2000's carried his libretto around in big baggy jeans pockets so he could pull it out and code on his game any time he was out and about and had a free moment. I always thought that was so 1337.

[Zarel]

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. :/

[spqr0a1]

How about the Pyra? Seems to be close to your ideal. https://pyra-handheld.com/boards/pages/pyra/

[partisan]

I had a Sony Vaio Picturebook around that time and would use it to do homework, listen to MP3s, etc. I turned the sleep function off when listening to music and would just keep it in the pocket of my jacket. It was a beautiful little machine.