2018-09-29 work in progress
history of the inverted T arrow key arrangement on keyboard
[history of the inverted T arrow key arrangement on keyboard By Jim Burrows. At http://www.eldacur.com/~brons/NerdCorner/InverseT-History.html ]
2018-07-12 to read [The Keys To Success. A lot of early video game consoles secretly wanted to be home computers, too: Their makers either sold keyboard add-ons or failed miserably in the process. By Ernie Smith. At https://tedium.co/2017/04/27/video-games-keyboards-intellivision/ ]
2018-07 thanks to Marcin Wichary
See also: Arrow Keys Efficiency: vim HJKL vs IJKL
If you have a question, put $5 at patreon and message me.