The Global Keyboards: design specifications

GlobalKeyboards titlepageThe GLOBAL KEYBOARDS refer to a complimentary pair of generalized musical typewriters for computer-based electronic media. Since the design was formulated in 1986 it has been given several names: the Spectrum Keyboards (after a discarded color scheme), the One-Circle Global Keyboards (after an essential parameter of the design), or just my generalized keyboards. The complimentary relation between the two keyboards has also led me to call them male and female.

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http://www.siementerpstra.com/writings/Terpstra-GlobalKeyboards.pdf