Douglas Englebart's invention of the mouse, and Mother of All Demos in 1968 had mouse for the right hand, chording keyboard for the left hand. Seen here: https:

Douglas Englebart's invention of the mouse, and Mother of All Demos in 1968 had mouse for the right hand, chording keyboard for the left hand. Seen here: https://youtu.be/UhpTiWyVa6k?t=1949 https://youtu.be/UhpTiWyVa6k?t=1949 (It's still amazing to watch him explain that they don't look at the mouse while moving it, they look at the pointer).