I want a low latency handwriting tablet which can store and access all my data, including photos and videos. It does that now. I also would love to be able to

I want a low latency handwriting tablet which can store and access all my data, including photos and videos. It does that now. I also would love to be able to develop on it for times when I'm on the road or in the air (and not sitting in business class, so there's not enough room to open a laptop. Basically all that is missing now is the ability to run dev tools and an ide of some sort. I'll even be unpicky about the ide...