HARDWARE DOCUMENTATION OF A 127 - BUTTON ACCESSORY KEYBOARD.
Charles H. Amann, Melvin Klerer · Defense Technical Information Center (DTIC) · 1966
The Accessory Keyboard is a general, low-speed, experimental unit for an automatic programming system. The system permits mathematical symbols and phrases to be automatically typed on a Flexowriter. It has 127 coded push-button inputs corresponding to 127 optional phrases, symbols, or programs. (Author)