mounted to a board rather than a portable grip. One type of these, the so-called half-QWERTY layout, uses only minimal chording, requiring the space bar to be pressed down if the alternate hand is used. It is otherwise a standard QWERTY keyboard of full size. It, and many other innovations in keyboard controls, were designed to deal with hand disabilities in particular. References External links Summary of keyers, commercially made keyers, other links, etc. (archived version) GKOS back-panel chording keyboard, an open standard for handheld devices Twiddler 2 one-handed chording keyboard/mouse Data Egg one-handed chording keyboard for handheld devices Yet another one-hand keyboard — Do-it-yourself, wearable, one-hand keyboard prototypes Wearable keyer suitable for QRP use (leg mount accessory) Intelligent Image Processing (See Appendix on keyers) How to make your own custom-molded perfect-fit keyer Spiff chorder (keyer for daily wearable computer use) Computer keyboard types