OK, see my initial writeup at Github.com (https://opengeometry.github.io/NOTES/beagleboneblack/). Using USB Gadget driver and *BeagleBone Black*, I was successful in making scriptable * * * *keyboard* * *mouse* --- relative mouse * *touchscreen* --- absolute mouse, basically simple one-finger touchscreen I will try out *Raspberry Pi* and *Odroid*, after I do some yardwork that I've been neglecting.